# OpenAI: GPT-5.6 Luna Pro

Provider: openai  
Category: llm  
Model ID: `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

## Specs

- Context length: 1050000 tokens
- Max output: 128000 tokens
- Modalities: file, image, text
- Released: 2026-07-09

## Pricing

- Input: $1.00 per million tokens
- Output: $6.00 per million tokens

## Verdict

GPT-5.6 Luna Pro delivers OpenAI's largest context window yet at 1M tokens, making it the go-to for processing entire codebases, legal documents, or multi-hour transcripts in a single pass. The $1/$6 per Mtok pricing sits between o1 and GPT-4o, positioning it as a mid-tier option for context-heavy work. Reach for this when you need to reason across massive documents but don't need o1's deep reasoning or can't afford Claude's premium rates.

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Last verified: 2026-07-10T02:00:04.178Z  
Canonical URL: https://switchy.build/directory/models/gpt-5-6-luna-pro