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Models › openai › OpenAI: GPT-5.6 Luna Pro

OpenAI: GPT-5.6 Luna Pro — pricing & benchmarks

By openai · Updated 2026-07-24 · long-context / RAGvision / documentscheap high-volumestep-by-step reasoning

OpenAI: GPT-5.6 Luna Pro costs $0.2 per 1M input tokens and $1.2 per 1M output tokens, with a 1M context window. It is best suited for long-context / RAG, vision / documents, cheap high-volume, step-by-step reasoning, and is available through one OpenAI-compatible Appmo API key.
$0.2Input / 1M
$1.2Output / 1M
1MContext
—Intelligence
—Coding
—GPQA %
—Speed tok/s

What OpenAI: GPT-5.6 Luna Pro is used for

OpenAI: GPT-5.6 Luna Pro is best suited for long-context / RAG, vision / documents, cheap high-volume, step-by-step reasoning. Access it through one Appmo API key alongside 390 other models — Appmo's optimizer can route to it automatically when it is the best value for a request.

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"openai/gpt-5.6-luna-pro","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does OpenAI: GPT-5.6 Luna Pro cost?
OpenAI: GPT-5.6 Luna Pro costs $0.2 per 1M input tokens and $1.2 per 1M output tokens ($0.45 blended), as of 2026-07-24. Prices are expected to fall as competition increases.

What is OpenAI: GPT-5.6 Luna Pro best for?
OpenAI: GPT-5.6 Luna Pro is best suited for long-context / RAG, vision / documents, cheap high-volume, step-by-step reasoning.

How do I use OpenAI: GPT-5.6 Luna Pro?
Send requests to Appmo's OpenAI-compatible endpoint with model id "openai/gpt-5.6-luna-pro" and one API key — no separate provider account needed.