AI model · OpenAI
GPT-5.1
Model ID: openai/gpt-5.1
- Input
- $1.25 per 1M tokens
- Output
- $10 per 1M tokens
- Context
- 400K tokens at once
- Max output
- 128K tokens per reply
- Released
- 13 Nov 2025 OpenAI
What it can do
- YesReasoning
- YesTool calling
- YesImage input
- NoOpen weights
- NoFree to use
Takes image, text, file; gives text.
How its listing describes it
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...
Sources
- OpenAI: GPT-5.1 on OpenRouter — read 2 Oct 2026