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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
Released
23 Apr 2026

Cite

Notes

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Attribution

Benchmark scores
frontiermathAAAnthropicprime-hubLiveBenchmatharenaVals AI
Attribution policy →
Context
1.1M
Input
$5
/1M tok
Output
$30
/1M tok
Blended
$11.25
#428/ 441/1M · 3:1
Speed
0
#109/ 441tok/s
Cache read
$0.25
0.05x input

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

Reasoning effortIndexSpeed
xhigh56.30 t/s
high54.70 t/s
medium51.40 t/s
low44.50 t/s
Non-reasoning35.80 t/s

Intelligence Index per reasoning-effort setting, via Artificial Analysis · pricing identical across tiers

Reported on 48 evals across 20 domains - best 100.0% on Physgym Arena Medley Public · #1 of 6

Reported eval scores

48