Updated

GPT-6 Luna

OpenAI released GPT-6 Luna alongside Sol as a lower-cost model, with API pricing of $0.10 per million input tokens and $0.50 per million output tokens. Free and Go users can access Luna in the desktop app.

By No Code MBA · Facts checked

Provider
OpenAI
Announcement date
Status at last check
Generally available
Model family
GPT-6
Capabilities
Text, Image

What changed

GPT-6 Luna (gpt-6-luna) is the lower-cost model released alongside GPT-6 Sol. OpenAI's model docs list a 1,050,000-token context window (922,000 max input), 128,000 max output tokens, text and image input with text output, and a May 18, 2026 knowledge cutoff. It supports reasoning with effort levels from none to max, with medium as the default.

Access and availability

Available in the OpenAI API as gpt-6-luna. OpenAI says Free and Go ChatGPT users can access Luna in the desktop app.

Official access documentation

Pricing

$0.10 per million input tokens, $0.01 per million cached input tokens and $0.50 per million output tokens (higher above 272K input tokens)

Official pricing

What you can build

Test a high-volume workflow such as classifying support requests or extracting structured fields from incoming documents.

Limitations

Output is text only. Prompts over 272K input tokens are billed at higher rates (2x input, 1.5x output).

Sources and release history