OpenAI: GPT-5.6 Luna Pro (openai/gpt-5.6-luna-pro) costs $0.2 per 1M prompt tokens and $1.2 per 1M completion tokens, has a 1,050,000-token context window, and supports tool calling, structured outputs, reasoning and response format. Data updated 2026-10-30.
- Prompt price
- $0.2 / 1M tokens
- Completion price
- $1.2 / 1M tokens
- Context
- 1,050,000 tokens
- Input modalities
- file, image, text
- Output modalities
- text
- Tokenizer
- GPT
- Instruct type
- —
- Knowledge cutoff
- 2026-02-16
- Hugging Face
- —
Last price change: 2026-08-18
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. **Cost note:** pro mode spends far more...