GPT-5 Nano (batch)

GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger counterparts, it retains key instruction-following and safety features. It is the successor to GPT-4.1-nano and offers a lightweight option for cost-sensitive or real-time applications.

ChatOpenAI400k tokens$0.0273 / $0.218 · 1M

openai/gpt-5-nano:batch

Context
400k tokens
Completion cap
128,000
Tools
Yes
JSON
Yes
Released
2025-08-07

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

Frequently asked questions

What is GPT-5 Nano (batch)?
GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger counterparts, it retains key instruction-following and safety features. It is the successor to GPT-4.1-nano and offers a lightweight option for cost-sensitive or real-time applications. GPT-5 Nano (batch) runs on the Geek Hub API (OpenAI-compatible). Model id: openai/gpt-5-nano:batch.
Is GPT-5 Nano (batch) free?
No. Input is $0.0273 per 1M tokens and output is $0.218 per 1M tokens on Geek Hub (markup included).
What is the context length of GPT-5 Nano (batch)?
GPT-5 Nano (batch) has a 400k tokens context window. It supports up to 128,000 completion tokens.
Does GPT-5 Nano (batch) support tool calling and structured outputs?
GPT-5 Nano (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 Nano (batch) released?
GPT-5 Nano (batch) was released on 2025-08-07.

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