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GPT-5.5

Closed

GPT-5.5 is an AI model from OpenAI.

Publisher
OpenAI
Family
GPT
Context
1.1M
Input
Output
License
proprietary
Released
23 Apr 2026

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Notes

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Attribution

Benchmark scores
frontiermathAAprime-hubLiveBenchmatharenaVals AI
Attribution policy →
Context
1.1M
Input
$5
/1M tok
Output
$30
/1M tok
Blended
$11.25
#404/ 414/1M · 3:1
Speed
62
#155/ 414tok/s
Cache read
$0.50
0.10x input

Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter

Reported on 37 evals across 13 domains - best 100.0% on Physgym Arena Medley Public · #1 of 6

Reported eval scores

37
Slitherlink Env4.2
Physgym Arena Medley Public100
Crystal Relaxation90
Apex Shortlist86.2
Teaching Env75.7
Ar Credit Release V154.2
Physgym Arena Drhard Public45.3
Graphwalks15.1
LiveBench - Language85.6
Terminal-Bench (Hard)49.2
LiveBench - Reasoning87.3
LiveBench - Coding78.6
LiveBench - Data Analysis77
IFBench46.1
LiveBench - Instruction Following65.7
LiveBench - Math69.8
MathArena92.8
FrontierMath51.7
FrontierScience: Expert-Level Scientific Reasoning44.8
MMLU-Pro88.6
Vals Index67.6
LiveBench77.3
Humanity's Last Exam (HLE)12.6
CorpFin v268.4
MortgageTax68.8
Finance Agent (v2)51.8
TaxEval v275
MedScribe86.9
MedCode49.1
SciCode47.3
GPQA Diamond76.8
Vibe Code Bench v1.169.8
Vals Multimodal Index67.8
SAGE51.5
ProofBench50
τ²-bench (Tau²-bench)69.3