OpenAI
LLM
Light
Closed weights
GPT-6 Luna
51 days since OpenAI announced it ·
GPT-6 Luna is a closed-weights LLM from OpenAI, announced 22 Sep 2026. It costs $0.10 per 1M input tokens and $0.50 per 1M output tokens. Its context window is 1.05M tokens.
- Input
- $0.10
- per 1M tokens
- Cache write
- $0.12
- per 1M tokens
- Cache read
- $0.01
- per 1M tokens
- Output
- $0.50
- per 1M tokens
- Context window
- 1.05M
- tokens
- Parameters
- —
- not disclosed
- Announcement
- openai.com/index/introducing-gpt-6-sol-and-luna
- Docs
- developers.openai.com/api/docs/models/gpt-6-luna
Our coverage
2 storiesOpenAI · Light
closed weights- GPT-6 Luna +75d
- GPT-5.6 Luna +114d
- GPT-5.4 nano +222d
- GPT-5 nano
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All modelsFacts last updated , from OpenAI’s own pages.