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
CheaperClaude Fable 5.1xhigh+10%-70%$5.98Context: 1.05M → 1M+6BetterGPT-6.1 Solhigh+6%-94%$0.32Remove unsupported parameters+5
OpenGLM 5.3 Flashmax-26%-100%$0.28Context: 1.05M → 1M+5CheaperClaude Opus 5.5max+9%-88%$5.98Context: 1.05M → 1M+6CheaperGPT-6 Astrahigh+9%-70%$1.73Monitoring can return HTTP 403+2ModelScoreCostPer taskWhat changes
Claude Fable 5.1xhigh+10%-70%$5.98Context: 1.05M → 1M+6Claude Opus 5.5max+9%-88%$5.98Context: 1.05M → 1M+6GPT-6 Astrahigh+9%-70%$1.73Monitoring can return HTTP 403+2
Gemini 4 Argonhigh+8%-94%*$1.99Context: 1.05M → 1M+3GPT-6.1 Solmax+8%-94%$0.72Remove unsupported parameters+5ModelScoreCostPer taskWhat changes
GPT-6.1 Solhigh+6%-94%$0.32Remove unsupported parameters+5GPT-6 Astralow+4%-70%$0.82Monitoring can return HTTP 403+2Gemini 3.8 Flashhigh+3%-98%*$1.24Context: 1.05M → 1M+2Claude Opus 5.5medium+4%-88%$1.34Context: 1.05M → 1M+6GPT-5.6 Solmax+4%-88%$1.99ModelScoreCostPer taskWhat changes
GLM 5.3 FlashmaxOpen-26%-100%$0.28Context: 1.05M → 1M+5
DeepSeek V4 Pro 0813highOpen-29%-97%$1.32 / $3.96Context: 1.05M → 1M+6
Kimi K3maxOpen-32%-91%$2.00Context: 1.05M → 1M+4TInkling SmallxhighOpen-56%-99%$0.45 / $1.20Context: 1.05M → 256K+1
Qwen3.8 27BxhighOpen-57%-99%$1.01Context: 1.05M → 262K+5ModelScoreCostPer taskWhat changes
GPT-6 Astrahigh+9%—$1.73Monitoring can return HTTP 403+2GPT-6.1 Solhigh+6%—$0.32Remove unsupported parameters+5GPT-5.4 Proxhigh+2%—$30 / $180No strict JSONGPT-5.6 Solhigh-4%—$0.81GPT-5.5high-9%—$1.54Prompts with >272K input tokensGPT-5.4high-16%—$2.50 / $15GPT-5.6 Terrahigh-18%—$0.34Prompts with >272K input tokensGPT-6 Solhigh-29%—$0.37All 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 ARC-AGI-2 · public evaluation, GPT-5.5 Pro scores 90.4 vs 92.2 — 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 GLM 5.3 Flash.
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?›
Claude Fable 5.1 (cheaper), GPT-6.1 Sol (better), GLM 5.3 Flash (open weights).