GPT-5.5 Pro (xhigh)

OpenAI · released 2026-04-23 · 1 offers

Context 922K tokens

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1 of 7 inputs · 1 from the model family6 radar axes: DesignArena's two boards share one

90.7

dominance-adjusted from 95.1: a better-measured model that is at least as good on each of these inputs ranks above it

AA Coding —Coding Agent v1.4 —AA Intelligence —AA Agentic —Epoch ECI 162.3Software ECI —DesignArena —/—

Radar: percentile among all models measured on each input; a gap means not measured.

4 of 140 registered benchmark versions · bars show the percentile among all models measured on each benchmark.

Composite attachments (used in the score, not counted as exact benchmarks):

FrontierMath Tiers 1–3 v2 (Epoch AI)9187.7%2026-09-16
FrontierMath Tiers 1–3 v2 (Epoch AI) v2 ↗ · Published board — Unpublished, expert-written mathematics problems from undergraduate to research level with automatically checkable answers, run by Epoch AI on its private v2 set.
FrontierMath Tier 4 v2 (Epoch AI)7578.0%2026-09-16
FrontierMath Tier 4 v2 (Epoch AI) v2 ↗ · Published board — The hardest, research-level tier of Epoch AI's unpublished FrontierMath problems, run by Epoch AI on its private v2 set.

BullshitBench V2 (clear pushback)4536.0%2026-09-15
BullshitBench V2 (clear pushback) published 2026-09-10 ↗ · Published board — Whether a model rejects the broken premise of 100 deliberately nonsensical prompts (V2 question set) instead of answering them confidently.

CritPt (AA)9930.6%2026-09-10
CritPt (AA) published 2026-09-10 ↗ · Published board — Tests research-level physics reasoning with Python, symbolic and numerical answers.

Missing coverage · 141 benchmark versions

No result does not mean a zero, or that the model was never tested. Collection failures and disputed versions retain their distinct status.

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