Kimi K3 vs Claude Opus 4.8 (Fast): side-by-side summary

Kimi K3 and Claude Opus 4.8 (Fast) are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Kimi K3, from moonshotai, has a 1,048,576-token context window and is priced at $2.60/M tokens input, $13/M tokens output on OpenRouter.

Claude Opus 4.8 (Fast), from Anthropic, has a 1,000,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.

Context window

• Kimi K3: 1,048,576 tokens
• Claude Opus 4.8 (Fast): 1,000,000 tokens

Price

• Kimi K3: $2.60/M tokens input, $13/M tokens output
• Claude Opus 4.8 (Fast): $10/M tokens input, $50/M tokens output

Provided by

• Kimi K3: moonshotai
• Claude Opus 4.8 (Fast): Anthropic

• Kimi K3 model details, providers and pricing
• Claude Opus 4.8 (Fast) model details, providers and pricing