Overview
Claude Opus 5.5 vs Kimi K3.1 Pro: side-by-side summary
Claude Opus 5.5 and Kimi K3.1 Pro are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Claude Opus 5.5, from Anthropic, has a 1,000,000-token context window and is priced at $4/M tokens input, $20/M tokens output on OpenRouter.
Kimi K3.1 Pro, from moonshotai, has a 1,048,576-token context window and is priced at $2/M tokens input, $10/M tokens output on OpenRouter.
- Context window
- Claude Opus 5.5: 1,000,000 tokens
- Kimi K3.1 Pro: 1,048,576 tokens
- Price
- Claude Opus 5.5: $4/M tokens input, $20/M tokens output
- Kimi K3.1 Pro: $2/M tokens input, $10/M tokens output
- Provided by
- Claude Opus 5.5: Anthropic
- Kimi K3.1 Pro: moonshotai