# Claude Opus 5.5Low

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Anthropic

Canonical URL: https://benchize.com/models/claude-opus-5-5-low
Last updated: Thu, 22 Oct 2026 05:40:11 GMT

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Anthropic

## Benchmarks

| Benchmark | Score | ± | Rank | Cost | Source |  |
| --- | --- | --- | --- | --- | --- | --- |
| [ARC-AGI-1](https://benchize.com/benchmarks/arc-prize%3Av1_Semi_Private.md) | 88.5% | — | 81 / 245 | 0.12usd per task | [arc prize · v1](https://arcprize.org/media/data/leaderboard/v1.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.885 \| score_fraction \| v1_Semi_Private \| Higher is better \| \| `cost_per_task` \| 0.12007963999999999 \| usd_per_task \| v1_Semi_Private \| Lower is better \| ### Configuration evaluationSplit v1_Semi_Private harness Not reported modelGroup anthropic-claude-opus-5-5 modelType CoT Reasoning effort low sourceModelVersion anthropic-claude-opus-5-5-low thinkingEnabled true ### Source [Original source](https://arcprize.org/media/data/leaderboard/v1.json) Source arc prize Original model label Claude Opus 5.5 (Low) Source version v1 Observed 2026-10-22T05:20:04.066Z Evidence SHA-256 `2bf68d22dafba37047d07ad833ebc0e8199c9aa2f9eeaed50c75c1b704462836` Source locator `/evaluations/240` |  |  |  |  |  |  |
| [FrontierCode 1.1 main](https://benchize.com/benchmarks/frontiercode%3Av1_1%3Amain.md) | 47.3% | — | 35 / 125 | $0.4 | [frontiercode](https://cognition.com/data/frontiercode-leaderboard/data.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.473 \| score_fraction \| blocking_criteria_adjusted \| Higher is better \| \| `correct` \| 0.5175 \| score_fraction \| raw_rubric \| Higher is better \| \| `cost` \| 0.4036 \| USD \| per_rollout \| Lower is better \| ### Configuration harness claude-code Reasoning effort low sourceVersion v1_1 subset main ### Reported statistics flaggedRate 0 sampleSize 100 ### Source [Original source](https://cognition.com/data/frontiercode-leaderboard/data.json) Source frontiercode Original model label Claude Opus 5.5 Observed 2026-10-22T05:40:03.220Z Evidence SHA-256 `ff0040778b7bdf69c705ad7474f771fb5e53cfaf5cf8573b3a4614153543d75f` Source locator `/v1_1/data/Claude%20Opus%205.5/low/main` |  |  |  |  |  |  |
| [BullshitBench v2](https://benchize.com/benchmarks/bullshitbench%3Av2.md) | 63% | — | 40 / 191 | — | [bullshitbench · v2](https://api.github.com/repos/petergpt/bullshit-benchmark/contents/data/v2/latest/leaderboard.csv?ref=3c655234d15967738f95da696e3f938d4862dcf7) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `green_rate` \| 0.63 \| score_fraction \| all_attempts \| Higher is better \| \| `red_rate` \| 0.04 \| score_fraction \| all_attempts \| Lower is better \| \| `refusal_rate` \| 0.09 \| score_fraction \| all_attempts \| Lower is better \| \| `avg_score` \| 1.6374 \| score \| judge_grade_0_to_2 \| Higher is better \| ### Configuration Reasoning effort low suite v2 thinkingEnabled true ### Reported statistics acceptedCount 4 answeredCount 91 clearCount 63 errorCount 0 partialCount 24 rank 25 refusalCount 9 sampleSize 100 ### Source [Original source](https://api.github.com/repos/petergpt/bullshit-benchmark/contents/data/v2/latest/leaderboard.csv?ref=3c655234d15967738f95da696e3f938d4862dcf7) Source bullshitbench Original model label anthropic/claude-opus-5.5 Source version v2 Observed 2026-10-22T03:10:12.603Z Evidence SHA-256 `98b485e08764d1c97144bc4f7b28ced1a96d50850947c775870dfda0e5d749b5` Source locator `/rows/24` |  |  |  |  |  |  |
| [ToneBench Scriptwriting](https://benchize.com/benchmarks/tonebench%3Ascripts.md) | 2,480.6 | Range 2,419.3–2,530.5 | 7 / 126 | — | [tonebench](https://benchmark.towardsai.com/data/leaderboard.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `elo` \| 2480.6 \| rating \| reported \| Higher is better \| \| `overall` \| 84.28 \| percent \| reported \| Higher is better \| \| `anti_slop_numbers` \| 78.95 \| source_score \| rubric \| Higher is better \| \| `continuity_emotion` \| 84.99 \| source_score \| rubric \| Higher is better \| \| `cue_quality` \| 82.73 \| source_score \| rubric \| Higher is better \| \| `hook_strength` \| 82.52 \| source_score \| rubric \| Higher is better \| \| `length_adherence` \| 91.33 \| source_score \| rubric \| Higher is better \| \| `slop` \| 87.74 \| source_score \| rubric \| Higher is better \| \| `slop_score` \| 96.53 \| source_score \| rubric \| Higher is better \| \| `substance_accuracy` \| 87.22 \| source_score \| rubric \| Higher is better \| \| `tone_voice` \| 81.13 \| source_score \| rubric \| Higher is better \| \| `writing_quality` \| 82.22 \| source_score \| rubric \| Higher is better \| \| `youtube_best_practices` \| 82.86 \| source_score \| rubric \| Higher is better \| ### Configuration provider claude-code Reasoning effort low scoreScope 10_task_current sourceConfiguration claude-opus-5-5-low thinkingEnabled true ### Reported statistics Uncertainty Reported interval: 2,419.3–2,530.5 interval [2419.3,2530.5] rank 7 runCount 5 ### Source [Original source](https://benchmark.towardsai.com/data/leaderboard.json) Source tonebench Original model label Claude Opus 5.5 (low) Evaluated 2026-10-08 Observed 2026-10-22T04:40:14.102Z Evidence SHA-256 `4264338337f418d3ded7ace250cad64fe12cacbd4b79a312bfaf0ae9268a01c3` Source locator `/rows/6` |  |  |  |  |  |  |
| [AutomationBench](https://benchize.com/benchmarks/zapier%3Aautomationbench.md) | 24.2% | — | 29 / 113 | $0.51 | [zapier](https://framerusercontent.com/sites/4WTSl4BNjd1q9QFEFibC6h/lOvLnhItj8S8-1vyjH_s33Jn-WmUXPmiJ5Diajl0Q38.CMutaHYl.mjs) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 24.2 \| percent \| reported \| Higher is better \| \| `cost` \| 0.51 \| USD \| per_task \| Lower is better \| ### Configuration benchmarkVersion 1.0.6 costFootnote false Fallback policy Provider default Reasoning effort low Model configuration Claude Opus 5.5 (default fallbacks, Low) thinkingEnabled true Fallback is enabled for refusals; this does not mean every task used a fallback model. ### Reported statistics rank 29 ### Source [Original source](https://framerusercontent.com/sites/4WTSl4BNjd1q9QFEFibC6h/lOvLnhItj8S8-1vyjH_s33Jn-WmUXPmiJ5Diajl0Q38.CMutaHYl.mjs) Source zapier Original model label Claude Opus 5.5 (default fallbacks, Low) Observed 2026-10-21T16:34:56.783Z Evidence SHA-256 `43978e38f018789fa59c11de5328abe9e5905bfa9a5a4d601fa3aa4d9c153b0d` Source locator `/rows/28` |  |  |  |  |  |  |
| [ARC-AGI-2](https://benchize.com/benchmarks/arc-prize%3Av2_Semi_Private.md) | 70.14% | — | 55 / 243 | 0.24usd per task | [arc prize · v2](https://arcprize.org/media/data/leaderboard/v2.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.701388888888889 \| score_fraction \| v2_Semi_Private \| Higher is better \| \| `cost_per_task` \| 0.24127179999999998 \| usd_per_task \| v2_Semi_Private \| Lower is better \| ### Configuration evaluationSplit v2_Semi_Private harness Not reported modelGroup anthropic-claude-opus-5-5 modelType CoT Reasoning effort low sourceModelVersion anthropic-claude-opus-5-5-low thinkingEnabled true ### Source [Original source](https://arcprize.org/media/data/leaderboard/v2.json) Source arc prize Original model label Claude Opus 5.5 (Low) Source version v2 Observed 2026-10-22T05:20:04.306Z Evidence SHA-256 `4351eb696e78113b0459e9bb5f0258318b905efef34f473dcea51ce641b0d94d` Source locator `/evaluations/242` |  |  |  |  |  |  |
| [FrontierCode 1.1 extended](https://benchize.com/benchmarks/frontiercode%3Av1_1%3Aextended.md) | 60.33% | — | 28 / 125 | $0.35 | [frontiercode](https://cognition.com/data/frontiercode-leaderboard/data.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.6033 \| score_fraction \| blocking_criteria_adjusted \| Higher is better \| \| `correct` \| 0.6583 \| score_fraction \| raw_rubric \| Higher is better \| \| `cost` \| 0.3464 \| USD \| per_rollout \| Lower is better \| ### Configuration harness claude-code Reasoning effort low sourceVersion v1_1 subset extended ### Reported statistics flaggedRate 0.0067 sampleSize 150 ### Source [Original source](https://cognition.com/data/frontiercode-leaderboard/data.json) Source frontiercode Original model label Claude Opus 5.5 Observed 2026-10-22T05:40:03.220Z Evidence SHA-256 `ff0040778b7bdf69c705ad7474f771fb5e53cfaf5cf8573b3a4614153543d75f` Source locator `/v1_1/data/Claude%20Opus%205.5/low/extended` |  |  |  |  |  |  |

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Cite as: Claude Opus 5.5Low — Benchize, https://benchize.com/models/claude-opus-5-5-low (retrieved 2026-10-22)