OpenAI
GPT-5.6 Luna Pro
Updated: July 2026
GPT-5.6 Luna Pro is the same underlying model as [GPT-5.6 Luna](https://openrouter.ai/openai/gpt-5.6-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
- Context
- 1M
- Input
- $1/M
- Output
- $6/M
Capabilities
VISIONTEXTWEBCODINGTHINKINGWRITING
Similarly Priced Models
| Model | Provider | Context | Input Price | Output Price |
|---|---|---|---|---|
| GPT-5.6 Luna | OpenAI | 1M | $1/M | $6/M |
| Grok Build 0.1 | xAI | 256K | $1/M | $2/M |
| MiMo V2.5 Pro |  Xiaomi | 1M | $1/M | $3/M |
| Claude Haiku 4.5 | Anthropic | 200K | $1/M | $5/M |
| GPT-3.5 Turbo (older v0613) | OpenAI | 4K | $1/M | $2/M |