GPT-5.1

Refinement of GPT-5 at the same price. Better instruction following and tool handling.

ChatOpenAI400k tokens$1.3626 / $10.9006 · 1M

openai/gpt-5.1

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

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",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is GPT-5.1?
Refinement of GPT-5 at the same price. Better instruction following and tool handling. GPT-5.1 runs on the Geek Hub API (OpenAI-compatible). Model id: openai/gpt-5.1.
Is GPT-5.1 free?
No. Input is $1.3626 per 1M tokens and output is $10.9006 per 1M tokens on Geek Hub (markup included).
What is the context length of GPT-5.1?
GPT-5.1 has a 400k tokens context window. It supports up to 128,000 completion tokens.
Does GPT-5.1 support tool calling and structured outputs?
GPT-5.1 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 released?
GPT-5.1 was released on 2025-11-13.

More models from OpenAI