GPT-5.6 Luna vs Mistral Medium 3.5: side-by-side summary

GPT-5.6 Luna and Mistral Medium 3.5 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5.6 Luna, 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 Medium 3.5, from Mistral AI, has a 262,144-token context window and is priced at $1.50/M tokens input, $7.50/M tokens output on OpenRouter.

Context window

• GPT-5.6 Luna: 1,050,000 tokens
• Mistral Medium 3.5: 262,144 tokens

Price

• GPT-5.6 Luna: $0.20/M tokens input, $1.20/M tokens output
• Mistral Medium 3.5: $1.50/M tokens input, $7.50/M tokens output

Provided by

• GPT-5.6 Luna: OpenAI
• Mistral Medium 3.5: Mistral AI

• GPT-5.6 Luna model details, providers and pricing
• Mistral Medium 3.5 model details, providers and pricing