GPT-5.2 Chat

GPT-5.2 Chat (AKA Instant) is the fast, lightweight member of the 5.2 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on harder queries, improving accuracy on math, coding, and multi-step tasks without slowing down typical conversations. The model is warmer and more conversational by default, with better instruction following and more stable short-form reasoning. GPT-5.2 Chat is designed for high-throughput, interactive workloads where responsiveness and consistency matter more than deep deliberation.

ChatOpenAI128k tokens$1.9076 / $15.2608 · 1M

openai/gpt-5.2-chat

Context
128k tokens
Completion cap
32,000
Tools
Yes
JSON
Yes
Released
2025-12-10

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-5.2-chat",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is GPT-5.2 Chat?
GPT-5.2 Chat (AKA Instant) is the fast, lightweight member of the 5.2 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on harder queries, improving accuracy on math, coding, and multi-step tasks without slowing down typical conversations. The model is warmer and more conversational by default, with better instruction following and more stable short-form reasoning. GPT-5.2 Chat is designed for high-throughput, interactive workloads where responsiveness and consistency matter more than deep deliberation. GPT-5.2 Chat runs on the Geek Hub API (OpenAI-compatible). Model id: openai/gpt-5.2-chat.
Is GPT-5.2 Chat free?
No. Input is $1.9076 per 1M tokens and output is $15.2608 per 1M tokens on Geek Hub (markup included).
What is the context length of GPT-5.2 Chat?
GPT-5.2 Chat has a 128k tokens context window. It supports up to 32,000 completion tokens.
Does GPT-5.2 Chat support tool calling and structured outputs?
GPT-5.2 Chat accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was GPT-5.2 Chat released?
GPT-5.2 Chat was released on 2025-12-10.

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