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 to allocate computation dynamically, responding quickly to simple queries while spending more depth on complex tasks. The model produces clearer, more grounded explanations with reduced jargon, making it easier to follow even on technical or multi-step problems. Built for broad task coverage, GPT-5.1 delivers consistent gains across math, coding, and structured analysis workloads, with more coherent long-form answers and improved tool-use reliability. It also features refined conversational alignment, enabling warmer, more intuitive responses without compromising precision. GPT-5.1 serves as the primary full-capability successor to GPT-5

ChatOpenAI400k tokens$0.6813 / $5.4503 · 1M

openai/gpt-5.1:batch

Context
400k tokens
Completion cap
128,000
Tools
Yes
JSON
Yes
Released
2025-11-13

Call it from Geek Hub

Same OpenAI SDK. Change the base URL and the model id.

curl https://api.geekhub.mx/v1/chat/completions \
  -H "Authorization: Bearer $GEEKHUB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.1:batch",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is 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 to allocate computation dynamically, responding quickly to simple queries while spending more depth on complex tasks. The model produces clearer, more grounded explanations with reduced jargon, making it easier to follow even on technical or multi-step problems. Built for broad task coverage, GPT-5.1 delivers consistent gains across math, coding, and structured analysis workloads, with more coherent long-form answers and improved tool-use reliability. It also features refined conversational alignment, enabling warmer, more intuitive responses without compromising precision. GPT-5.1 serves as the primary full-capability successor to GPT-5 GPT-5.1 (batch) runs on the Geek Hub API (OpenAI-compatible). Model id: openai/gpt-5.1:batch.
Is GPT-5.1 (batch) free?
No. Input is $0.6813 per 1M tokens and output is $5.4503 per 1M tokens on Geek Hub (markup included).
What is the context length of GPT-5.1 (batch)?
GPT-5.1 (batch) has a 400k tokens context window. It supports up to 128,000 completion tokens.
Does GPT-5.1 (batch) support tool calling and structured outputs?
GPT-5.1 (batch) accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was GPT-5.1 (batch) released?
GPT-5.1 (batch) was released on 2025-11-13.

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