GPT-5.6 Luna Pro vs Mistral Small 4: side-by-side summary

GPT-5.6 Luna Pro and Mistral Small 4 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5.6 Luna Pro, from OpenAI, has a 1,050,000-token context window and is priced at $0.20/M tokens input, $1.20/M tokens output on OpenRouter.

Mistral Small 4, from Mistral AI, has a 262,144-token context window and is priced at $0.15/M tokens input, $0.60/M tokens output on OpenRouter.

Context window

• GPT-5.6 Luna Pro: 1,050,000 tokens
• Mistral Small 4: 262,144 tokens

Price

• GPT-5.6 Luna Pro: $0.20/M tokens input, $1.20/M tokens output
• Mistral Small 4: $0.15/M tokens input, $0.60/M tokens output

Provided by

• GPT-5.6 Luna Pro: OpenAI
• Mistral Small 4: Mistral AI

• GPT-5.6 Luna Pro model details, providers and pricing
• Mistral Small 4 model details, providers and pricing