Sign up

GPT-5.6 Luna (thinking)

Vision OpenAI

GPT-5.6 Luna configured with high reasoning effort. Optimized for cost-sensitive workloads requiring deeper thinking.

Try on Simtheory

Qwen 3.6 Plus Frontier Claude 4.5 Sonnet Frontier Claude 4.5 Sonnet (thinking) Frontier Claude 4.6 Opus Frontier Claude 4.6 Opus Max Frontier Claude 4.6 Sonnet Frontier Claude 4.6 Sonnet Max Frontier Claude 4.7 Opus Frontier Claude 4.7 Opus Max Frontier Claude Fable 5 Frontier

Specifications

Context window 1,050,000 tokens

Max output 128,000 tokens

Knowledge cutoff February 2026

Multipart messages Yes

Vision capabilities Yes

Default Parameters

Temperature 0.3

Top P 1.0

Frequency penalty 0.0

Presence penalty 0.0

More from OpenAI

GPT-5.6 Luna

GPT-5.6 Luna is optimized for cost-sensitive, high-volume workloads. Features 1.05M context window, 128k output tokens, and reasoning token support. Roughly …

1,050,000 ctx 128,000 out

GPT-5.6 Sol

Frontier

GPT-5.6 Sol is OpenAI's frontier model for the most complex professional work. Features 1.05M context window, 128k output tokens, and …

1,050,000 ctx 128,000 out

GPT-5.6 Sol (thinking)

Frontier

GPT-5.6 Sol configured with high reasoning effort for the most complex professional tasks.

1,050,000 ctx 128,000 out