OpenAI
GPT-5.6 Luna Pro
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
Model facts
- Context window
- 1.05M tokens
- Maximum output
- 128K tokens
- Cheapest paid input
- $0.1 per 1M tokens
- Cheapest paid output
- $0.6 per 1M tokens
- Open weights
- no
- Providers
- 4
Capabilities and modalities
reasoning, tool calling, structured output, attachments, text, image, pdf.
Observed price history
- 2026-08-24: $0.1 input / $0.6 output per 1M tokens
- 2026-08-28: $0.2 input / $1.2 output per 1M tokens
- 2026-08-31: $0.1 input / $0.6 output per 1M tokens
API providers
- OpenRouter (batch) — model id openai/gpt-5.6-luna-pro:batch; $0.1 input / $0.6 output per 1M tokens; provider documentation
- NanoGPT — model id openai/gpt-5.6-luna-pro; $0.2 input / $1.2 output per 1M tokens; provider documentation
- OpenRouter — model id openai/gpt-5.6-luna-pro; $0.2 input / $1.2 output per 1M tokens; provider documentation
- Venice AI — model id openai-gpt-56-luna-pro; $1.25 input / $7.5 output per 1M tokens; provider documentation