GPT-5.6 Luna

Most efficient in 5.6. $0.20/$1.20 per 1M — very competitive for high volume.

ChatOpenAI400k tokens$0.218 / $1.3081 · 1M

openai/gpt-5.6-luna

Context
400k tokens
Completion cap
128,000
Tools
Yes
JSON
Yes
Released
2026-07-09
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-5.6-luna",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is GPT-5.6 Luna?
Most efficient in 5.6. $0.20/$1.20 per 1M — very competitive for high volume. GPT-5.6 Luna runs on the Geek Hub API (OpenAI-compatible). Model id: openai/gpt-5.6-luna.
Is GPT-5.6 Luna free?
No. Input is $0.218 per 1M tokens and output is $1.3081 per 1M tokens on Geek Hub (markup included).
What is the context length of GPT-5.6 Luna?
GPT-5.6 Luna has a 400k tokens context window. It supports up to 128,000 completion tokens.
Does GPT-5.6 Luna support tool calling and structured outputs?
GPT-5.6 Luna accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was GPT-5.6 Luna released?
GPT-5.6 Luna was released on 2026-07-09.

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