← All models
OpenAI · Language model
GPT-5.6 Luna Pro
openai/gpt-5.6-luna-pro- Language
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 window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Input
- file, image, text
- Output
- text
- Reasoning effort
- max, xhigh, high, medium, low, none
- Tokenizer
- GPT
- Knowledge cutoff
- 2026-02-16
- Moderation
- provider-moderated
Supported parameters
Accepted by the model and forwarded as-is by the gateway.
- max_completion_tokens
- max_tokens
- reasoning
- reasoning_effort
- response_format
- seed
- structured_outputs
- tool_choice
- tools
Use it
POST /api/v1/chat/completions · MCP chat · full reference
curl https://omnirail.org/api/v1/chat/completions \
-H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
-d '{"model":"openai/gpt-5.6-luna-pro","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'