# GPT-5.5 ProExtra high

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OpenAI

Canonical URL: https://benchize.com/models/gpt-5-5-pro-xhigh
Last updated: Thu, 22 Oct 2026 09:10:07 GMT

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OpenAI

## Benchmarks

| Benchmark | Score | ± | Rank | Cost | Source |  |
| --- | --- | --- | --- | --- | --- | --- |
| [ARC-AGI-1](https://benchize.com/benchmarks/arc-prize%3Av1_Semi_Private.md) | 95% | — | 36 / 245 | 4.52usd per task | [arc prize · v1](https://arcprize.org/media/data/leaderboard/v1.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.95 \| score_fraction \| v1_Semi_Private \| Higher is better \| \| `cost_per_task` \| 4.52 \| usd_per_task \| v1_Semi_Private \| Lower is better \| ### Configuration evaluationSplit v1_Semi_Private harness Not reported modelGroup gpt-5-5-pro-2026-04-23-thinking modelType CoT Reasoning effort xhigh sourceModelVersion gpt-5-5-pro-2026-04-23-xhigh thinkingEnabled true ### Source [Original source](https://arcprize.org/media/data/leaderboard/v1.json) Source arc prize Original model label GPT-5.5 Pro (XHigh) Source version v1 Observed 2026-10-22T05:20:04.066Z Evidence SHA-256 `2bf68d22dafba37047d07ad833ebc0e8199c9aa2f9eeaed50c75c1b704462836` Source locator `/evaluations/151` |  |  |  |  |  |  |
| [FrontierMath Tiers 1–3 v2 (private)](https://benchize.com/benchmarks/epoch-ai%3Afrontiermath_tiers_1_3_v2.md) | 87.72% | SE ±1.95 pp | 8 / 50 | — | [epoch ai · FrontierMath-Tiers-1-3-v2-Private](https://epoch.ai/data/benchmark_data.zip#file=frontiermath_tiers_1_3_v2.csv) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.8771929824561403 \| score_fraction \| Best score (across scorers) \| Higher is better \| \| `mean_score` \| 0.8771929824561403 \| score_fraction \| mean_score \| Higher is better \| ### Configuration benchmarkVersion FrontierMath-Tiers-1-3-v2-Private reasoningBudget Not reported Reasoning effort xhigh sourceModelVersion gpt-5.5-pro_xhigh ### Reported statistics Uncertainty Standard error: ±1.95 pp standardError 0.019476010341530077 ### Source [Original source](https://epoch.ai/data/benchmark_data.zip#file=frontiermath_tiers_1_3_v2.csv) Source epoch ai Original model label gpt-5.5-pro Source version FrontierMath-Tiers-1-3-v2-Private Evaluated 2026-06-12T21:33:12.000Z Observed 2026-10-22T03:00:05.281Z Evidence SHA-256 `d3458d4272f99e04212525904a59fffffa7a94e827c62b26e36e3fd3e15fe587` Source locator `/rows/97` |  |  |  |  |  |  |
| [BullshitBench v2](https://benchize.com/benchmarks/bullshitbench%3Av2.md) | 36% | — | 96 / 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` \| 0.36 \| score_fraction \| all_attempts \| Higher is better \| \| `red_rate` \| 0.21 \| score_fraction \| all_attempts \| Lower is better \| \| `refusal_rate` \| 0.0 \| score_fraction \| all_attempts \| Lower is better \| \| `avg_score` \| 1.07 \| score \| judge_grade_0_to_2 \| Higher is better \| ### Configuration Reasoning effort xhigh suite v2 thinkingEnabled true ### Reported statistics acceptedCount 21 answeredCount 100 clearCount 36 errorCount 0 partialCount 43 rank 108 refusalCount 0 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 openai/gpt-5.5-pro Source version v2 Observed 2026-10-22T03:10:12.603Z Evidence SHA-256 `98b485e08764d1c97144bc4f7b28ced1a96d50850947c775870dfda0e5d749b5` Source locator `/rows/107` |  |  |  |  |  |  |
| [ARC-AGI-2](https://benchize.com/benchmarks/arc-prize%3Av2_Semi_Private.md) | 84.16% | — | 33 / 243 | 10.76usd per task | [arc prize · v2](https://arcprize.org/media/data/leaderboard/v2.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.8416 \| score_fraction \| v2_Semi_Private \| Higher is better \| \| `cost_per_task` \| 10.76 \| usd_per_task \| v2_Semi_Private \| Lower is better \| ### Configuration evaluationSplit v2_Semi_Private harness Not reported modelGroup gpt-5-5-pro-2026-04-23-thinking modelType CoT Reasoning effort xhigh sourceModelVersion gpt-5-5-pro-2026-04-23-xhigh thinkingEnabled true ### Source [Original source](https://arcprize.org/media/data/leaderboard/v2.json) Source arc prize Original model label GPT-5.5 Pro (XHigh) Source version v2 Observed 2026-10-22T05:20:04.306Z Evidence SHA-256 `4351eb696e78113b0459e9bb5f0258318b905efef34f473dcea51ce641b0d94d` Source locator `/evaluations/152` |  |  |  |  |  |  |
| [FrontierMath Tier 4 v2 (private)](https://benchize.com/benchmarks/epoch-ai%3Afrontiermath_tier_4_v2.md) | 78.05% | SE ±6.54 pp | 15 / 39 | — | [epoch ai · FrontierMath-Tier-4-v2-Private](https://epoch.ai/data/benchmark_data.zip#file=frontiermath_tier_4_v2.csv) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.7804878048780488 \| score_fraction \| Best score (across scorers) \| Higher is better \| \| `mean_score` \| 0.7804878048780488 \| score_fraction \| mean_score \| Higher is better \| ### Configuration benchmarkVersion FrontierMath-Tier-4-v2-Private reasoningBudget Not reported Reasoning effort xhigh sourceModelVersion gpt-5.5-pro_xhigh ### Reported statistics Uncertainty Standard error: ±6.54 pp standardError 0.06544589202438408 ### Source [Original source](https://epoch.ai/data/benchmark_data.zip#file=frontiermath_tier_4_v2.csv) Source epoch ai Original model label gpt-5.5-pro Source version FrontierMath-Tier-4-v2-Private Evaluated 2026-06-12T21:33:12.000Z Observed 2026-10-22T03:00:05.281Z Evidence SHA-256 `2bbef8e82ac84071e3ce42bf744f4fc39dff04a549ccb1a288e3800918bc2e55` Source locator `/rows/52` |  |  |  |  |  |  |
| [Chess Puzzles](https://benchize.com/benchmarks/epoch-ai%3Achess_puzzles.md) | 62% | SE ±4.88 pp | 8 / 64 | — | [epoch ai · Chess Puzzles](https://epoch.ai/data/benchmark_data.zip#file=chess_puzzles.csv) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.62 \| score_fraction \| Best score (across scorers) \| Higher is better \| \| `mean_score` \| 0.62 \| score_fraction \| mean_score \| Higher is better \| ### Configuration benchmarkVersion Chess Puzzles reasoningBudget Not reported Reasoning effort xhigh sourceModelVersion gpt-5.5-pro_xhigh ### Reported statistics Uncertainty Standard error: ±4.88 pp standardError 0.04878317312145634 ### Source [Original source](https://epoch.ai/data/benchmark_data.zip#file=chess_puzzles.csv) Source epoch ai Original model label gpt-5.5-pro Source version Chess Puzzles Evaluated 2026-10-14T09:56:16.000Z Observed 2026-10-22T03:00:05.281Z Evidence SHA-256 `a5b99d6d35252907b04e9a802873a9754ecc0248be92a1ebbd2ef0450e4bb015` Source locator `/rows/8` |  |  |  |  |  |  |

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Cite as: GPT-5.5 ProExtra high — Benchize, https://benchize.com/models/gpt-5-5-pro-xhigh (retrieved 2026-10-22)