supermarket

Vision-language

GPT-5.5 Pro

By OpenAI, in the GPT-5 family.

Released
23 Apr 2026
Status
Legacy
Context
1.1M
Max output
128K
Input per 1M tokens
$30.00
Output per 1M tokens
$180.00
Open weights
No
License
proprietary
Parameters
—
Knowledge cutoff
Dec 2025
Reasoning
Yes
Modalities
text, image → text

Category scores

Out of 100, from independent and third-party results only, by method category-2026-09-29.1.

Category scores
CategoryScoreRankCoverage
Knowledge & reasoning67.932 of 4

Benchmark results

Every result we hold for this model, with who ran it and where it was published.

Knowledge & reasoning

Knowledge & reasoning results
BenchmarkMetricValueProvenanceSettingEvaluatedSource
DTBench (Decision Theory Benchmark)Accuracy (capability questions)96.0%Third partyxhigh—https://conceptualreasoning.ai/dtbench via Epoch AI
LMCA (Language Model Conceptual Argumentation)Correlation with expert ratings (Pearson r)0.5394Third partyxhigh—https://conceptualreasoning.ai/lmca via Epoch AI
SimpleBenchScore (AVG@5)76.9%Third partyunknown—https://lmcouncil.ai/benchmarks via Epoch AI
SimpleBenchScore (AVG@5)76.9%Third partyhigh—SimpleBench Leaderboard via Epoch AI

Mathematics

Mathematics results
BenchmarkMetricValueProvenanceSettingEvaluatedSource
FrontierMath Tier 4Accuracy78.0%Independentxhigh12 Jun 2026Epoch AI
FrontierMath Tiers 1-3Accuracy87.7%Independentxhigh12 Jun 2026Epoch AI

Other GPT-5 versions

Sources