Model board / GPT-6 Luna

Verified 2026-09-24 against the pages listed below. Prices are USD per 1M tokens, list rate — no committed-use, enterprise or volume discount.

above 272K input tokens: $0.20/$0.02/$0.25/$0.75 for the whole request. Batch and Flex halve every column

922,000 max input tokens

cached input at 10% of base; implicit or explicit-only mode, and an entry lives at least 30 minutes after its last write or reuse

Watch out

Half GPT-5.6 Luna's $0.20/$1.20 on both sides, and GPT-5.6 Luna carries no deprecation date — so nothing forces the move, and nothing but your own eval tells you the cheaper row does the same job

What we would use it for

OpenAI's pick for cost-sensitive, high-volume work — the cheapest OpenAI row on the board by half

What this has cost, week by week

Output price at each refresh since 2026-09-24. A vendor change is the provider changing its price. Our correction means this board changed what it prints and the provider's charge did not move — the two are never merged, because publishing the second as the first would be a price rise that never happened.

Nothing has moved since we started tracking it.

Where these numbers came from

• https://developers.openai.com/api/docs/pricing
• https://developers.openai.com/api/docs/models
• https://developers.openai.com/api/docs/guides/prompt-caching
• https://developers.openai.com/api/docs/models/gpt-6-luna
• https://developers.openai.com/api/docs/changelog

No number on this page was written that was not read from one of those pages on 2026-09-24. If one is wrong, send us the source URL and it is corrected in the next weekly refresh, with a changelog line saying what was wrong — contact@naderu.com.

Jobs this is one of our picks for

• Chat assistant — Multi-turn conversation, the ordinary case (chat-assistant)
• Content writing — Drafting and rewriting to a house style (content-writing)
• Document understanding — OCR, scans, charts and forms (document-understanding)
• RAG and grounded answers — Answers built on passages you retrieved (rag-grounded-answers)
• Content moderation — Classify against a policy (content-moderation)

Discussed in Naderu Weekly

• Three launches, no price rises — 2026-09-24

The rest of the board

This row sits alongside 64 others on the model board, refreshed every week. The same data as JSON, and the terms for using it, are at /board-data.