GPT-6 Luna Pro
GPT-6 Luna Pro is the same underlying model as [GPT-6 Luna](https://openrouter.ai/openai/gpt-6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode
Specifications
| Lab | OpenAI |
|---|---|
| Context window | 1.1M tokens |
| Input price | $0.10/1M |
| Output price | $0.50/1M |
| Release | Sep 2026 |
Strengths
- Pro reasoning mode for difficult tasks
- 1.05M-token context window
- Low listed input and output pricing
Weaknesses
- Pro mode costs more latency than standard Luna
- Limited independent evaluation data
Best for
- Complex reasoning
- Long-context coding
- High-accuracy agents
In Depth: GPT-6 Luna Pro
Summary
GPT-6 Luna Pro is an AI model from OpenAI.
Released in Sep 2026. It takes file, image, and text input and produces text output, with a context window of 1.1M tokens. Input pricing is $0.10 per 1M tokens and output is $0.50 per 1M tokens on OpenRouter.