# Claude Opus 5.5

> Source: Benchize (https://benchize.com) — https://benchize.com/models/claude-opus-5-5. When citing or reusing this content, credit "Benchize" and link to https://benchize.com/models/claude-opus-5-5.

Anthropic

Canonical URL: https://benchize.com/models/claude-opus-5-5
Last updated: Wed, 21 Oct 2026 18:05:10 GMT

Reproduction and quotation must name Benchize, link to the canonical HTML URL, and retain individual source citations.

Anthropic

## Benchmarks

| Benchmark | Score | ± | Rank | Cost | Source |  |
| --- | --- | --- | --- | --- | --- | --- |
| [DesignArena Data visualization generation](https://benchize.com/benchmarks/designarena%3Adata-viz.md) | 1,397elo | — | 1 / 99 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=data-viz) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1397 \| elo \| data-viz \| Higher is better \| ### Configuration arenaType models category dataviz inputModality Not reported sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics averageGenerationTimeMs 182745 battles 643 losses 227 standardError Not reported winRate 64.7 wins 416 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=data-viz) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:37:58.264Z Evidence SHA-256 `a895f6f1a25fa8eb01f821c2097ddec4f884de7bd22f1b8a22e82e6679b71849` Source locator `/data/0` |  |  |  |  |  |  |
| [DesignArena Website generation](https://benchize.com/benchmarks/designarena%3Awebsite.md) | 1,336elo | — | 4 / 123 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=website) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1336 \| elo \| website \| Higher is better \| ### Configuration arenaType models category website inputModality text sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics averageGenerationTimeMs 301118 battles 2185 losses 926 standardError Not reported winRate 57.6 wins 1259 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=website) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:37:57.757Z Evidence SHA-256 `51873e97776a3c5ae706b24cc2c60384793dd18398df970e213a8e7c276d8ac0` Source locator `/data/4` |  |  |  |  |  |  |
| [Rapidata Text-to-3D with LLM code — Creativity](https://benchize.com/benchmarks/rapidata%3Atext-to-3d-code%3Arlb_1YVqTDVUylKrUp.md) | 1,168.54elo | CI 1,145.21–1,191.88 | 6 / 9 | — | [rapidata](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query?leaderboard_id%5Beq%5D=rlb_1YVqTDVUylKrUp) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1168.5441801131947 \| elo \| rlb_1YVqTDVUylKrUp \| Higher is better \| ### Configuration benchmarkId bmk_1YVpXgN69Mv8I9 criterion rlb_1YVqTDVUylKrUp participantId par_1YVpXvedltQA8Z sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,145.21–1,191.88 confidenceIntervalLowerOffset 23.339010462470924 confidenceIntervalUpperOffset 23.339010462470924 totalMatches 4829 wins 2869 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query?leaderboard_id%5Beq%5D=rlb_1YVqTDVUylKrUp) Source rapidata Original model label claude-opus-5.5 Source version Observed 2026-10-21T16:37:42.177Z Evidence SHA-256 `4ce251bc655221de3fef117b85e05f775323a39098049de2bbfd4835ca2c6293` Source locator `/items/5` |  |  |  |  |  |  |
| [DistressBench](https://benchize.com/benchmarks/scale%3Adistressbench.md) | 75.58source score | CI 74.38–76.78 | 8 / 27 | — | [scale](https://labs.scale.com/leaderboard/distressbench) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 75.58 \| source_score \| reported \| Higher is better \| ### Configuration Reasoning effort unknown Model configuration claude-opus-5.5 sourceModelVersion claude-opus-5-5 thinkingEnabled Not reported ### Reported statistics Uncertainty Confidence interval: 74.38–76.78 contaminationWarning Not reported rank 9 reportedConfidenceHalfWidth 1.2 ### Source [Original source](https://labs.scale.com/leaderboard/distressbench) Source scale Original model label claude-opus-5.5 Observed 2026-10-21T16:35:27.403Z Evidence SHA-256 `6ca6a76569e51fde037c8e2610bdf7bc39d99b54c69b6b4dc0dba9ec2a4e24da` Source locator `/rows/8` |  |  |  |  |  |  |
| [Vending-Bench 2](https://benchize.com/benchmarks/vendingbench%3Av2.md) | — | — | — | $9,235.25 | [vendingbench](https://andonlabs.com/_app/immutable/chunks/Cjn0_qj9.js) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `final_balance` \| 9235.248333333331 \| USD \| one_simulated_year \| Higher is better \| \| `geometric_mean_balance` \| 9070.9344824782 \| USD \| positive_final_balances \| Higher is better \| ### Configuration Reasoning effort unknown Model configuration Claude Opus 5.5 thinkingEnabled Not reported ### Reported statistics confidenceHalfWidth95 1538.057846335321 positiveBalanceRuns 6 runCount 6 standardDeviation 1922.171897145691 standardError 784.7233909874087 ### Source [Original source](https://andonlabs.com/_app/immutable/chunks/Cjn0_qj9.js) Source vendingbench Original model label Claude Opus 5.5 Observed 2026-10-21T16:36:40.592Z Evidence SHA-256 `1a0b043147050298c405bcb743d73e425d532464202231cd18c27f836fa5f223` Source locator `/rows/14` |  |  |  |  |  |  |
| [Rapidata SVG generation — Alignment](https://benchize.com/benchmarks/rapidata%3Asvg%3Arlb_1MFkk9yZHssERh.md) | 1,516.39elo | CI 1,485.79–1,546.99 | 3 / 37 | — | [rapidata · v1](https://api.rapidata.ai/benchmark/bmk_1MFkc3sXfbKCqf/standings/query?leaderboard_id%5Beq%5D=rlb_1MFkk9yZHssERh) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1516.385416517795 \| elo \| rlb_1MFkk9yZHssERh \| Higher is better \| ### Configuration benchmarkId bmk_1MFkc3sXfbKCqf criterion rlb_1MFkk9yZHssERh participantId par_1VuObOzOuUSxTC sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,485.79–1,546.99 confidenceIntervalLowerOffset 30.60013460004211 confidenceIntervalUpperOffset 30.60013460004211 totalMatches 3752 wins 2868 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1MFkc3sXfbKCqf/standings/query?leaderboard_id%5Beq%5D=rlb_1MFkk9yZHssERh) Source rapidata Original model label claude-opus-5.5 Source version v1 Observed 2026-10-21T16:37:40.342Z Evidence SHA-256 `2f5c8d08728735790b500d930d71b66f04253f1209f7c1c3da0db0846c163fcf` Source locator `/items/3` |  |  |  |  |  |  |
| [Humanity's Last Exam (Diamond)](https://benchize.com/benchmarks/scale%3Ahle-diamond.md) | 55source score | CI 51.9–58.1 | 2 / 12 | — | [scale](https://labs.scale.com/leaderboard/hle-diamond) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 55 \| source_score \| reported \| Higher is better \| ### Configuration Reasoning effort unknown Model configuration claude-opus-5-5 sourceModelVersion Not reported thinkingEnabled Not reported ### Reported statistics Uncertainty Confidence interval: 51.9–58.1 contaminationWarning Potential contamination warning: This model was evaluated after the public release of HLE, allowing model builder access to the prompts and solutions. rank 2 reportedConfidenceHalfWidth 3.1 ### Source [Original source](https://labs.scale.com/leaderboard/hle-diamond) Source scale Original model label claude-opus-5-5 Observed 2026-10-21T16:35:27.820Z Evidence SHA-256 `c60d42f5aacdf787d9ccc8b70817766d86707776a7f8b44ef0337cb9ae60bf20` Source locator `/rows/1` |  |  |  |  |  |  |
| [OpenVibeEval Accessibility](https://benchize.com/benchmarks/openvibeeval%3Aaccessibility.md) | 83 | — | 4 / 26 | — | [openvibeeval](https://openvibeeval.com/leaderboard/) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `adjusted_score` \| 83 \| score \| sample_size_adjusted_accessibility \| Higher is better \| ### Configuration Reasoning effort unknown Model configuration Claude Opus 5.5 thinkingEnabled Not reported ### Reported statistics runCount 4 ### Source [Original source](https://openvibeeval.com/leaderboard/) Source openvibeeval Original model label Claude Opus 5.5 Evaluated 2026-09-23 Observed 2026-10-21T16:32:04.885Z Evidence SHA-256 `9b2e7d6060910e3dc7083a6a7f67377601ce78806b2b6b7693cf8d047dd63fbb` Source locator `/rows/0` |  |  |  |  |  |  |
| [DesignArena UI component generation](https://benchize.com/benchmarks/designarena%3Aui-components.md) | 1,395elo | — | 2 / 112 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=ui-components) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1395 \| elo \| ui-components \| Higher is better \| ### Configuration arenaType models category uicomponent inputModality Not reported sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics averageGenerationTimeMs 207023 battles 382 losses 133 standardError Not reported winRate 65.2 wins 249 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=ui-components) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:37:57.993Z Evidence SHA-256 `46482ec1b4012638eace65493daea4750e2088098018fd9d5fc46126fc1f8557` Source locator `/data/1` |  |  |  |  |  |  |
| [DesignArena Overall frontend coding](https://benchize.com/benchmarks/designarena%3Acode.md) | 1,390elo | SE ±5.44 | 1 / 116 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=code) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1390 \| elo \| code \| Higher is better \| ### Configuration arenaType models category allcategories inputModality text sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics Uncertainty Standard error: ±5.44 averageGenerationTimeMs 286845 battles 4620 losses 1668 standardError 5.4413 winRate 63.9 wins 2952 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=code) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:37:57.301Z Evidence SHA-256 `0c897b58670f5e352bd123db999a40c0d1781a443964c502b90774a76a3a7758` Source locator `/data/0` |  |  |  |  |  |  |
| [FrontierSWE v2 abs](https://benchize.com/benchmarks/frontierswe%3Av2%3Aabs.md) | 62.33source score | — | 2 / 15 | — | [frontierswe](https://www.frontierswe.com/) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `overall` \| 62.33098823529411 \| source_score \| mean \| Higher is better \| \| `overall_best` \| 71.51528235294118 \| source_score \| best \| Higher is better \| \| `overall_worst` \| 51.991805882352935 \| source_score \| worst \| Higher is better \| \| `implementation` \| 80.39130142857144 \| source_score \| mean \| Higher is better \| \| `performance` \| 45.292633333333335 \| source_score \| mean \| Higher is better \| \| `research` \| 57.32538666666665 \| source_score \| mean \| Higher is better \| ### Configuration aggregation mean harness proximus normalization abs Reasoning effort unknown ### Source [Original source](https://www.frontierswe.com/) Source frontierswe Original model label Claude Opus 5.5 Observed 2026-10-21T16:31:27.602Z Evidence SHA-256 `818e027068cf61ff1aadd8281b6e49e9c6795221015210601b5e34d0d223e5b5` Source locator `/rows/1` |  |  |  |  |  |  |
| [DesignArena SVG generation](https://benchize.com/benchmarks/designarena%3Asvgs.md) | 1,333elo | — | 2 / 77 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=svgs) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1333 \| elo \| svgs \| Higher is better \| ### Configuration arenaType models category svg inputModality Not reported sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics averageGenerationTimeMs 44476 battles 1011 losses 483 standardError Not reported winRate 52.2 wins 528 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=svgs) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:38:03.249Z Evidence SHA-256 `8cbc34a474a66ef5c64f3ffe557df9b55bf7e13368c07c0214223e3ed8f3f21e` Source locator `/data/3` |  |  |  |  |  |  |
| [Rapidata Text-to-3D with LLM code — Preference](https://benchize.com/benchmarks/rapidata%3Atext-to-3d-code%3Arlb_1YVpXugYHlm63x.md) | 1,357.33elo | CI 1,333.41–1,381.25 | 5 / 9 | — | [rapidata](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query?leaderboard_id%5Beq%5D=rlb_1YVpXugYHlm63x) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1357.331354192793 \| elo \| rlb_1YVpXugYHlm63x \| Higher is better \| ### Configuration benchmarkId bmk_1YVpXgN69Mv8I9 criterion rlb_1YVpXugYHlm63x participantId par_1YVpXvedltQA8Z sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,333.41–1,381.25 confidenceIntervalLowerOffset 23.92149295906097 confidenceIntervalUpperOffset 23.92149295906097 totalMatches 5395 wins 3640.5 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query?leaderboard_id%5Beq%5D=rlb_1YVpXugYHlm63x) Source rapidata Original model label claude-opus-5.5 Source version Observed 2026-10-21T16:37:43.410Z Evidence SHA-256 `a30cb5e42eb353cd3fadbb4c6519873ad22d3f0528a4e569fbbe40160928d934` Source locator `/items/4` |  |  |  |  |  |  |
| [Rapidata Text-to-3D with LLM code — Overall preference](https://benchize.com/benchmarks/rapidata%3Atext-to-3d-code%3Aoverall.md) | 1,315.24elo | CI 1,303.66–1,326.82 | 5 / 9 | — | [rapidata](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1315.2397696535736 \| elo \| overall \| Higher is better \| ### Configuration benchmarkId bmk_1YVpXgN69Mv8I9 criterion overall participantId par_1YVpXvedltQA8Z sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,303.66–1,326.82 confidenceIntervalLowerOffset 11.583332448065448 confidenceIntervalUpperOffset 11.583332448065676 totalMatches 21014.20185386591 wins 14032.30311085952 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query) Source rapidata Original model label claude-opus-5.5 Source version Observed 2026-10-21T16:37:41.757Z Evidence SHA-256 `048d6dec5a711f63fb70b09a6495cf440b0bf6f34f80156b97832c611e7a2913` Source locator `/items/4` |  |  |  |  |  |  |
| [DesignArena 3D design generation](https://benchize.com/benchmarks/designarena%3A3d-design.md) | 1,477elo | — | 2 / 110 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=3d-design) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1477 \| elo \| 3d-design \| Higher is better \| ### Configuration arenaType models category 3d inputModality Not reported sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics averageGenerationTimeMs 294636 battles 857 losses 241 standardError Not reported winRate 71.9 wins 616 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=3d-design) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:37:58.515Z Evidence SHA-256 `bcc0267f7bc7e9ec112306b3a35413cf78bbccbfaa838356232d5d5ed0b83d0f` Source locator `/data/1` |  |  |  |  |  |  |
| [Rapidata SVG generation — Overall preference](https://benchize.com/benchmarks/rapidata%3Asvg%3Aoverall.md) | 1,385.89elo | CI 1,369.32–1,402.47 | 3 / 37 | — | [rapidata · v1](https://api.rapidata.ai/benchmark/bmk_1MFkc3sXfbKCqf/standings/query) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1385.8921339636063 \| elo \| overall \| Higher is better \| ### Configuration benchmarkId bmk_1MFkc3sXfbKCqf criterion overall participantId par_1VuObOzOuUSxTC sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,369.32–1,402.47 confidenceIntervalLowerOffset 16.573365617757645 confidenceIntervalUpperOffset 16.573365617757645 totalMatches 11256.370236111408 wins 8040.594884342206 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1MFkc3sXfbKCqf/standings/query) Source rapidata Original model label claude-opus-5.5 Source version v1 Observed 2026-10-21T16:37:39.078Z Evidence SHA-256 `4b73ff7e4ca0ecfd64f7888c2d64f3398a058c945c4644acd54eddb330e16d66` Source locator `/items/5` |  |  |  |  |  |  |
| [HiL-Bench (Human-in-Loop Benchmark)](https://benchize.com/benchmarks/scale%3Ahil.md) | 59source score | CI 53.58–64.42 | 6 / 22 | — | [scale](https://labs.scale.com/leaderboard/hil) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 59 \| source_score \| reported \| Higher is better \| ### Configuration Reasoning effort unknown Model configuration Claude Opus 5.5 sourceModelVersion Not reported thinkingEnabled Not reported ### Reported statistics Uncertainty Confidence interval: 53.58–64.42 contaminationWarning Not reported rank 8 reportedConfidenceHalfWidth 5.42 ### Source [Original source](https://labs.scale.com/leaderboard/hil) Source scale Original model label Claude Opus 5.5 Observed 2026-10-21T16:35:30.082Z Evidence SHA-256 `043a333e27453edada150667c7f4439b2aab463f37928c2153c6aa79f33dd1b2` Source locator `/rows/7` |  |  |  |  |  |  |
| [Creative Writing v3](https://benchize.com/benchmarks/eq-bench%3Acreative-writing-v3.md) | 2,050.1elo | — | 7 / 90 | — | [eq bench · creative-writing-v3](https://eqbench.com/creative_writing.js) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo_score` \| 2050.1 \| elo \| overall \| Higher is better \| \| `creative_writing_score` \| 16.79 \| rubric_score \| overall \| Higher is better \| ### Configuration interactiveAdjustments none protocol creative-writing-v3 sourceModelVersion claude-opus-5-5 ### Source [Original source](https://eqbench.com/creative_writing.js) Source eq bench Original model label claude-opus-5-5 Source version creative-writing-v3 Observed 2026-10-21T16:35:01.421Z Evidence SHA-256 `722ddb132e8d3a5e5c39b8d445f8475f3f7e24893a007260c6f3e3cce5c1ee18` Source locator `/leaderboardDataCreativeWritingV3/6` |  |  |  |  |  |  |
| [DesignArena Image to web application](https://benchize.com/benchmarks/designarena%3Aimage-to-webapp.md) | 1,292elo | SE ±18.84 | 2 / 24 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=image-to-webapp) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1292 \| elo \| image-to-webapp \| Higher is better \| ### Configuration arenaType agents category agon_webapps inputModality image sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics Uncertainty Standard error: ±18.84 averageGenerationTimeMs Not reported battles 385 losses 166 standardError 18.8445 winRate 56.9 wins 219 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=image-to-webapp) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:37:59.412Z Evidence SHA-256 `cc4e49fc057d3b786184ff44b697422e2420a174e8a98a80a77aa65021921ab4` Source locator `/data/1` |  |  |  |  |  |  |
| [Rapidata SVG generation — Coherence](https://benchize.com/benchmarks/rapidata%3Asvg%3Arlb_1MFkkBzpuU8fTG.md) | 1,178.69elo | CI 1,152.51–1,204.88 | 5 / 37 | — | [rapidata · v1](https://api.rapidata.ai/benchmark/bmk_1MFkc3sXfbKCqf/standings/query?leaderboard_id%5Beq%5D=rlb_1MFkkBzpuU8fTG) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1178.694403638135 \| elo \| rlb_1MFkkBzpuU8fTG \| Higher is better \| ### Configuration benchmarkId bmk_1MFkc3sXfbKCqf criterion rlb_1MFkkBzpuU8fTG participantId par_1VuObOzOuUSxTC sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,152.51–1,204.88 confidenceIntervalLowerOffset 26.188126767716767 confidenceIntervalUpperOffset 26.188126767716767 totalMatches 3752 wins 2275.5 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1MFkc3sXfbKCqf/standings/query?leaderboard_id%5Beq%5D=rlb_1MFkkBzpuU8fTG) Source rapidata Original model label claude-opus-5.5 Source version v1 Observed 2026-10-21T16:37:39.715Z Evidence SHA-256 `aa3cb94ff16f544c58adeea35b9087d281c785058b8ce1ae0f98a7ff84920930` Source locator `/items/8` |  |  |  |  |  |  |
| [Fortress](https://benchize.com/benchmarks/scale%3Afortress.md) | 13.18source score | CI 11.41–14.95 | 26 / 31 | — | [scale](https://labs.scale.com/leaderboard/fortress) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 13.18 \| source_score \| reported \| Higher is better \| ### Configuration Reasoning effort unknown Model configuration claude-opus-5-5 sourceModelVersion Not reported thinkingEnabled Not reported ### Reported statistics Uncertainty Confidence interval: 11.41–14.95 contaminationWarning ORS Score: 9.50 rank 10 reportedConfidenceHalfWidth 1.77 ### Source [Original source](https://labs.scale.com/leaderboard/fortress) Source scale Original model label claude-opus-5-5 Observed 2026-10-21T16:35:37.552Z Evidence SHA-256 `875f1c5b1112c4b84f3d17df72771ebee5c293c542cbb8ab3399e35c4f82ffa5` Source locator `/rows/9` |  |  |  |  |  |  |
| [DesignArena Agentic web applications](https://benchize.com/benchmarks/designarena%3Awebapps.md) | 1,318elo | SE ±14.48 | 3 / 39 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=webapps) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1318 \| elo \| webapps \| Higher is better \| ### Configuration arenaType agents category agon_webapps inputModality text sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics Uncertainty Standard error: ±14.48 averageGenerationTimeMs Not reported battles 628 losses 246 standardError 14.4773 winRate 60.8 wins 382 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=webapps) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:38:00.309Z Evidence SHA-256 `f955787274cf4ac627ada7cd33eaae2e08ef7297db92d3391340fcaa0b44a35f` Source locator `/data/3` |  |  |  |  |  |  |
| [Longform Creative Writing](https://benchize.com/benchmarks/eq-bench%3Alongform-writing.md) | 84.6% | — | 3 / 93 | — | [eq bench · longform-writing](https://eqbench.com/creative_writing_longform.js) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `overall_score_100` \| 84.6 \| percent \| overall \| Higher is better \| \| `chapter1_avg` \| 17.53 \| rubric_score \| overall \| Higher is better \| \| `chapter2_avg` \| 17.09 \| rubric_score \| overall \| Higher is better \| \| `chapter3_avg` \| 17.16 \| rubric_score \| overall \| Higher is better \| \| `chapter4_avg` \| 17.19 \| rubric_score \| overall \| Higher is better \| \| `chapter5_avg` \| 17.39 \| rubric_score \| overall \| Higher is better \| \| `chapter6_avg` \| 17.49 \| rubric_score \| overall \| Higher is better \| \| `chapter7_avg` \| 17.42 \| rubric_score \| overall \| Higher is better \| \| `chapter8_avg` \| 17.15 \| rubric_score \| overall \| Higher is better \| \| `final_judgement_avg` \| 17.50 \| rubric_score \| overall \| Higher is better \| ### Configuration interactiveAdjustments none protocol longform-writing sourceModelVersion claude-opus-5-5 ### Source [Original source](https://eqbench.com/creative_writing_longform.js) Source eq bench Original model label claude-opus-5-5 Source version longform-writing Observed 2026-10-21T16:35:02.575Z Evidence SHA-256 `3ba283ce357ac7620e16db640a961879c30fe3ddc50a27de9a8ed4290784825c` Source locator `/leaderboardDataLongformV3/137` |  |  |  |  |  |  |
| [DesignArena Browser game generation](https://benchize.com/benchmarks/designarena%3Agame-dev.md) | 1,458elo | — | 3 / 117 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=game-dev) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1458 \| elo \| game-dev \| Higher is better \| ### Configuration arenaType models category gamedev inputModality Not reported sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics averageGenerationTimeMs 336311 battles 789 losses 223 standardError Not reported winRate 71.7 wins 566 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=game-dev) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:38:01.100Z Evidence SHA-256 `53db6a89112ce8cdf644568c666d4b8309aece764cfcedb291ffd52ae3934e30` Source locator `/data/2` |  |  |  |  |  |  |
| [Rapidata Text-to-3D with LLM code — Coherence](https://benchize.com/benchmarks/rapidata%3Atext-to-3d-code%3Arlb_1YVpXufudyOLlc.md) | 1,388.76elo | CI 1,365.47–1,412.05 | 3 / 9 | — | [rapidata](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query?leaderboard_id%5Beq%5D=rlb_1YVpXufudyOLlc) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1388.760478714639 \| elo \| rlb_1YVpXufudyOLlc \| Higher is better \| ### Configuration benchmarkId bmk_1YVpXgN69Mv8I9 criterion rlb_1YVpXufudyOLlc participantId par_1YVpXvedltQA8Z sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,365.47–1,412.05 confidenceIntervalLowerOffset 23.289039594262476 confidenceIntervalUpperOffset 23.289039594262476 totalMatches 5395 wins 3822.5 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query?leaderboard_id%5Beq%5D=rlb_1YVpXufudyOLlc) Source rapidata Original model label claude-opus-5.5 Source version Observed 2026-10-21T16:37:42.585Z Evidence SHA-256 `59243752590bb5f22389edbe87b8cc11b00e9a6fc49b5b94753544fc8780e58d` Source locator `/items/2` |  |  |  |  |  |  |
| [SimpleBench](https://benchize.com/benchmarks/simplebench%3Aavg-at-5.md) | 88.4% | — | 1 / 62 | — | [simplebench](https://simple-bench.com/static/js/leaderboard-data.js) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `accuracy` \| 88.4 \| percent \| average_at_5 \| Higher is better \| ### Configuration Reasoning effort unknown Model configuration Claude Opus 5.5 thinkingEnabled Not reported ### Reported statistics rank 1st ### Source [Original source](https://simple-bench.com/static/js/leaderboard-data.js) Source simplebench Original model label Claude Opus 5.5 Observed 2026-10-21T16:32:13.183Z Evidence SHA-256 `b2d0285ad3e4e15750ed20d39897e7558d1c05e8962e90c861b06f93c8019dc9` Source locator `/rows/1` |  |  |  |  |  |  |
| [DesignArena Mobile application development](https://benchize.com/benchmarks/designarena%3Amobileapps.md) | 1,312elo | SE ±14.08 | 2 / 33 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=mobileapps) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1312 \| elo \| mobileapps \| Higher is better \| ### Configuration arenaType agents category mobileapps inputModality Not reported sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics Uncertainty Standard error: ±14.08 averageGenerationTimeMs Not reported battles 685 losses 256 standardError 14.0761 winRate 62.6 wins 429 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=mobileapps) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:38:02.538Z Evidence SHA-256 `40af33d0e93e729486da375cbe954633e2458af0dd6ca6d9fbdcda90da650f7d` Source locator `/data/1` |  |  |  |  |  |  |
| [Rapidata SVG generation — Preference](https://benchize.com/benchmarks/rapidata%3Asvg%3Arlb_1MFkkEMFnCNyKl.md) | 1,537.37elo | CI 1,506.07–1,568.67 | 5 / 37 | — | [rapidata · v1](https://api.rapidata.ai/benchmark/bmk_1MFkc3sXfbKCqf/standings/query?leaderboard_id%5Beq%5D=rlb_1MFkkEMFnCNyKl) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1537.3664192777635 \| elo \| rlb_1MFkkEMFnCNyKl \| Higher is better \| ### Configuration benchmarkId bmk_1MFkc3sXfbKCqf criterion rlb_1MFkkEMFnCNyKl participantId par_1VuObOzOuUSxTC sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,506.07–1,568.67 confidenceIntervalLowerOffset 31.30030420331309 confidenceIntervalUpperOffset 31.30030420331309 totalMatches 3752 wins 2894 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1MFkc3sXfbKCqf/standings/query?leaderboard_id%5Beq%5D=rlb_1MFkkEMFnCNyKl) Source rapidata Original model label claude-opus-5.5 Source version v1 Observed 2026-10-21T16:37:40.980Z Evidence SHA-256 `b70f07a4924c82499996aba613ca8ec2d0aee9ec9ebd404e45c8bf250206cf40` Source locator `/items/5` |  |  |  |  |  |  |
| [PRBench Legal](https://benchize.com/benchmarks/scale%3Aprbench-legal.md) | 47.58source score | CI 45.38–49.78 | 15 / 26 | — | [scale](https://labs.scale.com/leaderboard/prbench-legal) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 47.58 \| source_score \| reported \| Higher is better \| ### Configuration Reasoning effort unknown Model configuration claude-opus-5-5 sourceModelVersion Not reported thinkingEnabled Not reported ### Reported statistics Uncertainty Confidence interval: 45.38–49.78 contaminationWarning Not reported rank 20 reportedConfidenceHalfWidth 2.2 ### Source [Original source](https://labs.scale.com/leaderboard/prbench-legal) Source scale Original model label claude-opus-5-5 Observed 2026-10-21T16:35:35.197Z Evidence SHA-256 `9e2ca4e9350870cf508bf5fff603d0b795c81f7974a0ab980312bbbfa0785067` Source locator `/rows/19` |  |  |  |  |  |  |
| [DesignArena Image to HTML](https://benchize.com/benchmarks/designarena%3Aimage-to-html.md) | 1,245elo | — | 6 / 35 | — | [designarena · public](https://www.designarena.ai/api/leaderboard#board=image-to-html) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1245 \| elo \| image-to-html \| Higher is better \| ### Configuration arenaType models category website inputModality image sourceModelVersion claude-opus-5-5 variationName public ### Reported statistics averageGenerationTimeMs 243115 battles 417 losses 187 standardError Not reported winRate 55.2 wins 230 ### Source [Original source](https://www.designarena.ai/api/leaderboard#board=image-to-html) Source designarena Original model label Claude Opus 5.5 Source version public Observed 2026-10-21T16:37:58.959Z Evidence SHA-256 `94f97ebbdd53a8c56f138b620e59b3a9b35c66c3954dcaaa1b2ed4c71518b404` Source locator `/data/6` |  |  |  |  |  |  |
| [Rapidata Text-to-3D with LLM code — Alignment](https://benchize.com/benchmarks/rapidata%3Atext-to-3d-code%3Arlb_1YVpXug2nDeUlV.md) | 1,357.94elo | CI 1,334.39–1,381.49 | 4 / 9 | — | [rapidata](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query?leaderboard_id%5Beq%5D=rlb_1YVpXug2nDeUlV) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 1357.9360469806122 \| elo \| rlb_1YVpXug2nDeUlV \| Higher is better \| ### Configuration benchmarkId bmk_1YVpXgN69Mv8I9 criterion rlb_1YVpXug2nDeUlV participantId par_1YVpXvedltQA8Z sourceModelVersion claude-opus-5.5 weighted false ### Reported statistics Uncertainty Confidence interval: 1,334.39–1,381.49 confidenceIntervalLowerOffset 23.550160480894874 confidenceIntervalUpperOffset 23.5501604808951 totalMatches 5395 wins 3700 ### Source [Original source](https://api.rapidata.ai/benchmark/bmk_1YVpXgN69Mv8I9/standings/query?leaderboard_id%5Beq%5D=rlb_1YVpXug2nDeUlV) Source rapidata Original model label claude-opus-5.5 Source version Observed 2026-10-21T16:37:42.991Z Evidence SHA-256 `a2223beea99910879fd4c5ded70604d3d62dcff1f04a3b617d13f28f03a75948` Source locator `/items/3` |  |  |  |  |  |  |

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Cite as: Claude Opus 5.5 — Benchize, https://benchize.com/models/claude-opus-5-5 (retrieved 2026-10-21)