GPT-6 Luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks, and at higher reasoning effort it can take on complex software engineering and computer-use tasks that previously called for a Sol-tier model. It shares the GPT-6 family's gains in factual reliability and its clearer, more concise communication style.

ChatOpenAI1M tokens$0.109 / $0.545 · 1M

openai/gpt-6-luna

Context
1M tokens
Completion cap
128,000
Tools
Yes
JSON
Yes
Released
2026-09-22

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-6-luna",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is GPT-6 Luna?
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks, and at higher reasoning effort it can take on complex software engineering and computer-use tasks that previously called for a Sol-tier model. It shares the GPT-6 family's gains in factual reliability and its clearer, more concise communication style. GPT-6 Luna runs on the Geek Hub API (OpenAI-compatible). Model id: openai/gpt-6-luna.
Is GPT-6 Luna free?
No. Input is $0.109 per 1M tokens and output is $0.545 per 1M tokens on Geek Hub (markup included).
What is the context length of GPT-6 Luna?
GPT-6 Luna has a 1M tokens context window. It supports up to 128,000 completion tokens.
Does GPT-6 Luna support tool calling and structured outputs?
GPT-6 Luna accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was GPT-6 Luna released?
GPT-6 Luna was released on 2026-09-22.

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