Claude Sonnet 5 vs GPT-5.6 Luna Pro: side-by-side summary

Claude Sonnet 5 and GPT-5.6 Luna Pro are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Sonnet 5, from Anthropic, has a 1,000,000-token context window and is priced at $2/M tokens input, $10/M tokens output on OpenRouter.

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.

Context window

• Claude Sonnet 5: 1,000,000 tokens
• GPT-5.6 Luna Pro: 1,050,000 tokens

Price

• Claude Sonnet 5: $2/M tokens input, $10/M tokens output
• GPT-5.6 Luna Pro: $0.20/M tokens input, $1.20/M tokens output

Provided by

• Claude Sonnet 5: Anthropic
• GPT-5.6 Luna Pro: OpenAI

• Claude Sonnet 5 model details, providers and pricing
• GPT-5.6 Luna Pro model details, providers and pricing