Overview
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 200,000-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: 200,000 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