GPT-5.1

Nov 2025
Retires Apr 1, 2027Move toGPT-6.1 SolNewer version
GPT-5.1
Compare in
on
—per task?
$1.25 / $10per 1M in / outcache $0.13
114 tok/sfirst token in 1.1 s?
400Kcontext

Alternatives?

History

17 versions
404550Oct 25Jan 26Apr 26Release dateVals MedCode5 · Aug5.1 · Nov5.2 · Dec5.4 · Mar5.5
404550Oct 25Jan 26Apr 26Release dateVals MedCode5 · Aug5.1 · Nov5.2 · Dec5.4 · Mar5.5

FAQ

How much does GPT-5.1 cost?›

$1.25 per 1M input tokens and $10 per 1M output tokens; cached input $0.13 per 1M.

Is GPT-5.1 free to use?›

There is no free API; the cheapest paid price is $1.25 per 1M input tokens.

How good is GPT-5.1, and what is it best at?›

#264 of 334 in Chat & Knowledge, #72 of 97 in Coding, #97 of 175 in Agents & Tool Use, #46 of 195 in Writing & Language, #89 of 124 in Vision & Documents.

Is GPT-5.1 better than GPT-5?›

On Vals MedCode, GPT-5.1 scores 52.7 vs 49.6 — higher.

How can I use GPT-5.1?›

Through the API of Azure, OpenAI.

What is the context window of GPT-5.1?›

400K tokens, with up to 128K output tokens.

When was GPT-5.1 released? Is there a newer version?›

Released 2025-11-13. It has been superseded by GPT-6 Sol.

Is GPT-5.1 open source?›

No, GPT-5.1 is a closed model available through an API. The closest open-weights option here is Kimi K3.

Can GPT-5.1 read images?›

It accepts text and images, PDF files as input.

What is GPT-5.1?›

GPT-5.1 is a closed language model from OpenAI, released Nov 2025, the successor to GPT-5.

What are the best alternatives to GPT-5.1?›

Gemini 3 Flash Preview (cheaper), Claude Opus 5 (better), Kimi K3 (open weights).