GPT-5.1
by OpenAI
GPT-5.1 is a model from OpenAI, released on November 13, 2025. It has a 400K-token context window and can generate up to 128K output tokens. API pricing is $1.25 per 1M input tokens and $10 per 1M output tokens.
The best model for coding and agentic tasks with configurable reasoning effort. GPT-5.1 is our flagship model for coding and agentic tasks with configurable reasoning and non-reasoning effort.
Key specs
| Provider | OpenAI |
|---|---|
| Release date | 2025-11-13 |
| License | proprietary |
| Context window | 400K tokens |
| Max output | 128K tokens |
| Input price | $1.25 / 1M tokens |
| Output price | $10 / 1M tokens |
| Intelligence Score | 36.5 |
| Coding index | 21 |
Quick answers
What is the context window of GPT-5.1?
GPT-5.1 has a context window of 400K tokens, with a maximum output of 128K tokens per response.
How much does GPT-5.1 cost?
GPT-5.1 costs $1.25 per 1M input tokens and $10 per 1M output tokens through the API.
Is GPT-5.1 open source?
No. GPT-5.1 is a proprietary model from OpenAI (proprietary license).
When was GPT-5.1 released?
OpenAI released GPT-5.1 on November 13, 2025.
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