Overview
Claude Sonnet 4.5 vs Grok 4.1 Fast: side-by-side summary
Claude Sonnet 4.5 and Grok 4.1 Fast are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Claude Sonnet 4.5, from Anthropic, has a 1,000,000-token context window and is priced at $3/M tokens input, $15/M tokens output on OpenRouter.
Grok 4.1 Fast, from SpaceXAI, has a 2,000,000-token context window and is priced by the provider serving it on OpenRouter.
- Context window
- Claude Sonnet 4.5: 1,000,000 tokens
- Grok 4.1 Fast: 2,000,000 tokens
- Price
- Claude Sonnet 4.5: $3/M tokens input, $15/M tokens output
- Grok 4.1 Fast: Pricing varies by provider
- Provided by
- Claude Sonnet 4.5: Anthropic
- Grok 4.1 Fast: SpaceXAI