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GPT-5.6 Luna

GPT-5.6 Luna

Vision OpenAI

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 corresponds to the nano model tier.

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

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