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OpenAI · Model

GPT 5.6 Luna API

GPT 5.6 Luna answers at api.apmix.ai under the id below — one key and one monthly plan, on the OpenAI and Anthropic wire formats your tools already speak. No separate OpenAI account, no per-provider bill.

Model idopenai/gpt-5.6-lunaStarterProMax
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At a glance

Provider
OpenAI
Included in
Starter, Pro, Max — from $4.99/month
Weighted-token cost
0.8× — a 1,000-token exchange costs 800 weighted tokens
Context window
1.1M tokens
Reasoning
Yes — thinks before it answers
Free tier
Paid plans only — the free models are the place to start
See what each plan buys on GPT 5.6 Luna

Call GPT 5.6 Luna

Set the model to gpt-5.6-luna in any OpenAI- or Anthropic-compatible client. Both base URLs accept the same apmix key.

OpenAI-compatible · Chat Completions
curl https://api.apmix.ai/v1/chat/completions \
  -H "Authorization: Bearer apx_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-5.6-luna", "messages": [{"role": "user", "content": "Hello"}]}'
Anthropic-compatible · Messages
curl https://api.apmix.ai/v1/messages \
  -H "x-api-key: apx_live_YOUR_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-5.6-luna", "max_tokens": 1024, "messages": [{"role": "user", "content": "Hello"}]}'
Setup guides for Claude Code, Codex CLI, Cursor and more

Questions about GPT 5.6 Luna

Is GPT 5.6 Luna free on apmix?
Not on the free tier. GPT 5.6 Luna is included from the Starter plan ($4.99/month), with one monthly allowance shared across every model in the plan. You can still start free on the free models.
Which plan includes GPT 5.6 Luna?
Starter, Pro, Max. Each plan is a monthly allowance of weighted tokens shared across every model and every key; GPT 5.6 Luna counts at 0.8× per token.
How do I use GPT 5.6 Luna in Claude Code, Codex CLI or Cursor?
Point the tool at apmix — https://api.apmix.ai/v1 for OpenAI-compatible clients, https://api.apmix.ai for Anthropic-compatible ones — with your apmix key, and set the model to gpt-5.6-luna. The Docs page has copy-paste setup for each tool.

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