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-6.1 Solmax+7%-94%$0.72Remove unsupported parameters+5
OpenKimi K3max-18%-91%$2.00Context: 1.05M → 1M+4CheaperGPT-6 Astramax+7%-70%$3.26Monitoring can return HTTP 403+2
CheaperClaude Opus 5.5max+4%-88%$5.98Context: 1.05M → 1M+6CheaperClaude Fable 5.1max+3%-70%$7.63Context: 1.05M → 1M+6ModelScoreCostPer taskWhat changes
GPT-6.1 Solmax+7%-94%$0.72Remove unsupported parameters+5GPT-6 Astramax+7%-70%$3.26Monitoring can return HTTP 403+2Claude Opus 5.5max+4%-88%$5.98Context: 1.05M → 1M+6Claude Fable 5.1max+3%-70%$7.63Context: 1.05M → 1M+6GPT-6 Solmax+2%-94%$1.04ModelScoreCostPer taskWhat changes
GPT-6.1 Solmax+7%-94%$0.72Remove unsupported parameters+5GPT-6 Solmax+2%-94%$1.04GPT-6 Astramax+7%-70%$3.26Monitoring can return HTTP 403+2Claude Opus 5.5max+4%-88%$5.98Context: 1.05M → 1M+6Claude Fable 5.1max+3%-70%$7.63Context: 1.05M → 1M+6ModelScoreCostPer taskWhat changes
Kimi K3maxOpen-18%-91%$2.00Context: 1.05M → 1M+4
GLM 5.3maxOpen-22%-97%$2.01Context: 1.05M → 1M+5
DeepSeek V4 Pro 0813maxOpen-26%-97%$0.67Context: 1.05M → 1M+6GLM 5.2maxOpen-33%-97%$1.47Context: 1.05M → 1M+1Kimi K2.6unstatedOpen-35%-97%$0.95 / $4Context: 1.05M → 256KModelScoreCostPer taskWhat changes
GPT-6.1 Solmax+7%—$0.72Remove unsupported parameters+5GPT-6 Astramax+7%—$3.26Monitoring can return HTTP 403+2GPT-6 Solmax+2%—$1.04GPT-5.6 Solmax+2%—$1.99GPT-5.6 Terramax-2%—$1.40Prompts with >272K input tokensGPT-5.5xhigh-3%—$2.63Prompts with >272K input tokensGPT-5.4 Pro (2026-03-05)-6%—$30 / $180No strict JSONGPT-5.6 Lunamax-6%—$0.18All 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 Claude Sonnet 5.5?›
On FrontierMath Tiers 1–3 (v2), GPT-5.5 Pro scores 87.7 vs 88.8 — lower.
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 Kimi K3.
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-6.1 Sol (cheaper), Kimi K3 (open weights).