Claude Opus 5 vs Sonar Reasoning Pro: side-by-side summary

Claude Opus 5 and Sonar Reasoning Pro 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.

Sonar Reasoning Pro, from Perplexity, has a 128,000-token context window and is priced at $2/M tokens input, $8/M tokens output on OpenRouter.

Context window

• Claude Opus 5: 1,000,000 tokens
• Sonar Reasoning Pro: 128,000 tokens

Price

• Claude Opus 5: $5/M tokens input, $25/M tokens output
• Sonar Reasoning Pro: $2/M tokens input, $8/M tokens output

Provided by

• Claude Opus 5: Anthropic
• Sonar Reasoning Pro: Perplexity

• Claude Opus 5 model details, providers and pricing
• Sonar Reasoning Pro model details, providers and pricing