Claude Opus 5 vs Kimi K3: side-by-side summary

Claude Opus 5 and Kimi K3 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Opus 5, from Anthropic, has a 1,000,000-token context window and is priced at $5/M tokens input, $25/M tokens output on OpenRouter.

Kimi K3, from moonshotai, has a 1,048,576-token context window and is priced at $2.80/M tokens input, $14/M tokens output on OpenRouter.

Context window

• Claude Opus 5: 1,000,000 tokens
• Kimi K3: 1,048,576 tokens

Price

• Claude Opus 5: $5/M tokens input, $25/M tokens output
• Kimi K3: $2.80/M tokens input, $14/M tokens output

Provided by

• Claude Opus 5: Anthropic
• Kimi K3: moonshotai

• Claude Opus 5 model details, providers and pricing
• Kimi K3 model details, providers and pricing