GPT-5.5 Pro
Apr 2026
GPT-5.5 ProCompare inon
GPT-5.5 Pro measured on 8 of 104 Chat & Knowledge benchmarks8
BenchmarkByScoreRank
Reasoning5
Math2
Science1
No benchmark matches
Alternatives?
ModelScoreCostPer taskWhat changes
CheaperGPT-5.6 Solmax+6%-88%$1.99
BetterMuse Wonder Full+7%——Context: 1.05M → 1M+1
OpenMiMo v2.6 Prothinking-13%-99%$0.13Context: 1.05M → 1M+4CheaperGPT-6.1 Solmax+4%-94%$0.72Remove unsupported parameters+5
CheaperClaude Opus 5.5max+4%-88%$5.98Context: 1.05M → 1M+6ModelScoreCostPer taskWhat changes
GPT-5.6 Solmax+6%-88%$1.99GPT-6.1 Solmax+4%-94%$0.72Remove unsupported parameters+5Claude Opus 5.5max+4%-88%$5.98Context: 1.05M → 1M+6GPT-6 Astramax+4%-70%$3.26Monitoring can return HTTP 403+2Claude Sonnet 5.5maxsame-94%$5.46Context: 1.05M → 1M+6ModelScoreCostPer taskWhat changes
Muse Wonder Full+7%——Context: 1.05M → 1M+1ModelScoreCostPer taskWhat changes
MiMo v2.6 ProthinkingOpen-13%-99%$0.13Context: 1.05M → 1M+4
DeepSeek V4.1 Flash 1017maxOpen-21%-99%$0.26Context: 1.05M → 1M+5
Kimi K3maxOpen-23%-91%$2.00Context: 1.05M → 1M+4
Step 5 PreviewthinkingOpen-32%-98%$1.03Context: 1.05M → 1M+3
GLM 5.2maxOpen-32%-97%$1.47Context: 1.05M → 1M+1ModelScoreCostPer taskWhat changes
GPT-6.1 Solxhigh+4%—$0.39Remove unsupported parameters+5GPT-6 Astraxhighsame—$2.31Monitoring can return HTTP 403+2GPT-5.4 Proxhighsame—$30 / $180No strict JSONGPT-5.6 Solxhigh-7%—$1.18GPT-6 Solxhigh-8%—$0.52GPT-5.6 Terraxhigh-11%—$0.63Prompts with >272K input tokensGPT-5.5xhigh-11%—$2.63Prompts with >272K input tokensGPT-5.4xhigh-23%—$2.50 / $15All OpenAI models →History
6 versionsFAQ
How much does GPT-5.5 Pro cost?›
$30 per 1M input tokens and $180 per 1M output tokens.
Is GPT-5.5 Pro free to use?›
There is no free API; the cheapest paid price is $30 per 1M input tokens.
How good is GPT-5.5 Pro, and what is it best at?›
#9 of 321 in Chat & Knowledge.
Is GPT-5.5 Pro better than GPT-5.4 Pro?›
On CritPt (physics), GPT-5.5 Pro scores 30.6 vs 30 — about the same.
How can I use GPT-5.5 Pro?›
Through the API of OpenAI.
What is the context window of GPT-5.5 Pro?›
1.05M tokens, with up to 128K output tokens.
When was GPT-5.5 Pro released? Is there a newer version?›
Released 2026-04-23. It is the current version in its line.
Is GPT-5.5 Pro open source?›
No, GPT-5.5 Pro is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.
Can GPT-5.5 Pro read images?›
It accepts text and images, PDF files as input.
What is GPT-5.5 Pro?›
GPT-5.5 Pro is a closed language model from OpenAI, released Apr 2026, the successor to GPT-5.4 Pro.
What are the best alternatives to GPT-5.5 Pro?›
GPT-5.6 Sol (cheaper), Muse Wonder Full (better), MiMo v2.6 Pro (open weights).