GPT-5.6 Luna Pricing
OpenAI · GPT-5.6 · Live
GPT-5.6 Luna costs $1 per million input tokens and $6 per million output tokens on the OpenAI API. Cached input reads are billed at $0.1 per million tokens. It supports a 1,048,576-token context window and up to 128,000 output tokens per request. The model supports image input, tool use, long context. Released July 9, 2026. Pricing verified July 29, 2026.
GPT-5.6 Luna API pricing
- Input (per 1M tokens)
- $1
- Output (per 1M tokens)
- $6
- Cached input (per 1M tokens)
- $0.1
- Batch discount
- 50%
- Context window
- 1,048,576 tokens
- Max output
- 128,000 tokens
- Released
- July 9, 2026
Capabilities
Price history
Price-stable since July 12, 2026.
Frequently asked questions
Notes
GPT-5.6 Luna — fastest and cheapest tier of OpenAI's new three-tier family. GA July 9, 2026. $1 input / $6 output per 1M tokens. Best for high-volume automation, classification, and simple generation. 90% prompt caching discount, 50% batch API discount. [2026-07-13] Context Window 400,000 → 1,048,576 and Max Output 100,000 → 128,000 — all three GPT-5.6 tiers share 1.05M context / 128K max output per openai.com GPT-5.6 announcement (corroborated by OpenRouter + simonwillison.net). Prices unchanged ($1/$6). Note: Luna retrieval quality degrades past ~300K context per vellum.ai testing — large window ≠ full-depth recall.