GPT-5 vs Claude Sonnet 4: side-by-side summary

GPT-5 and Claude Sonnet 4 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.

Claude Sonnet 4, from Anthropic, has a 1,000,000-token context window and is priced at $3/M tokens input, $15/M tokens output on OpenRouter.

Context window

• GPT-5: 400,000 tokens
• Claude Sonnet 4: 1,000,000 tokens

Price

• GPT-5: $1.25/M tokens input, $10/M tokens output
• Claude Sonnet 4: $3/M tokens input, $15/M tokens output

Provided by

• GPT-5: OpenAI
• Claude Sonnet 4: Anthropic

• GPT-5 model details, providers and pricing
• Claude Sonnet 4 model details, providers and pricing