Claude Opus 4.5 vs Kimi K2 Thinking: side-by-side summary

Claude Opus 4.5 and Kimi K2 Thinking are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Opus 4.5, from Anthropic, has a 200,000-token context window and is priced at $5/M tokens input, $25/M tokens output on OpenRouter.

Kimi K2 Thinking, from moonshotai, has a 262,144-token context window and is priced at $0.60/M tokens input, $2.50/M tokens output on OpenRouter.

Context window

• Claude Opus 4.5: 200,000 tokens
• Kimi K2 Thinking: 262,144 tokens

Price

• Claude Opus 4.5: $5/M tokens input, $25/M tokens output
• Kimi K2 Thinking: $0.60/M tokens input, $2.50/M tokens output

Provided by

• Claude Opus 4.5: Anthropic
• Kimi K2 Thinking: moonshotai

• Claude Opus 4.5 model details, providers and pricing
• Kimi K2 Thinking model details, providers and pricing