GPT-6 Luna Pro
Summary
GPT-6 Luna Pro is a language model from OpenAI, released on 22 Sept 2026. It accepts files, images and text and generates text, with a 1.1M-token context window and up to 128K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.10 per million input tokens and $0.50 per million output tokens (OpenRouter), across 1 provider we track.
GPT-6 Luna Pro is the same underlying model as [GPT-6 Luna](https://openrouter.ai/openai/gpt-6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | OpenAI |
|---|---|
| Release date | 22 Sept 2026 [OpenRouter] |
| Status | Generally available |
| Context window | 1.1M (1,050,000 tokens) [OpenRouter] |
| Max output | 128K tokens [OpenRouter] |
| Input | Files, images and text [OpenRouter] |
| Output | Text [OpenRouter] |
| Reasoning mode | Yes [OpenRouter] |
| Tool calling | Yes [OpenRouter] |
| Structured output | Yes [OpenRouter] |
GPT-6 Luna Pro API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter openai/gpt-6-luna-pro | $0.10 | $0.50 | $0.01 | 1.1M | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of GPT-6 Luna Pro?
GPT-6 Luna Pro has a context window of 1,050,000 tokens (1.1M) and can generate up to 128,000 tokens in a single response, according to OpenRouter.
How much does the GPT-6 Luna Pro API cost?
GPT-6 Luna Pro is listed from $0.10 per million input tokens and $0.50 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
When was GPT-6 Luna Pro released?
OpenAI released GPT-6 Luna Pro on 22 Sept 2026, according to OpenRouter.
Change history
No changes detected since we started tracking this model. We re-check every source daily.