OpenAI: GPT-5.1 (batch)
- by openai
- openai/gpt-5.1:batch
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...
What the numbers mean
- Context window400,000 tokens
- How much the model can read in one request, counting your prompt, any files and the conversation so far. That is about 300,000 words, or 600 pages.
- Max output128,000 tokens
- The longest single reply it can write: about 96,000 words.
- Input price$0.63 per million tokens
- What you pay for everything the model reads. A 1,000-word prompt costs less than a cent.
- Output price$5 per million tokens
- What you pay for everything the model writes. Output usually costs more than input. A 500-word answer costs less than a cent.
- Modalitiesimage, text, file in, text out
- The kinds of content it accepts and the kinds it produces. A model that takes images in can read a screenshot; one that only puts text out cannot draw.
Supported parameters
The settings you can pass with a request. A model that lists tools can call functions; one that lists structured_outputs can be held to a JSON schema.
include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools