GPT-5.1
GPT-5.1 is an incremental update to GPT-5, with improved instruction following and reduced latency. It keeps GPT-5's reasoning and tool-use profile while trimming verbosity on short prompts.
Specifications
| Lab | OpenAI |
|---|---|
| Context window | 400K tokens |
| Input price | $1.25/1M |
| Output price | $10.00/1M |
| Release | Nov 2025 |
Strengths
- Strong general knowledge
- Reliable structured output
- Broad tool-use capability
- Lower latency than GPT-5
Weaknesses
- Creative writing less nuanced than Claude
- 128K context trails long-context leaders
Best for
- General purpose tasks
- Tool calling & agents
- Structured output pipelines
In Depth: GPT-5.1
Summary
GPT-5.1 is an AI model from OpenAI.
Released in Nov 2025. It currently appears in the Overall category on LMRank. It takes text input and produces text output, with a context window of 400K tokens. Input pricing is $1.25 per 1M tokens and output is $10.00 per 1M tokens on OpenRouter.