Sonar Reasoning Pro vs Phi 4: side-by-side summary

Sonar Reasoning Pro and Phi 4 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

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.

Phi 4, from Microsoft, has a 16,384-token context window and is priced at $0.07/M tokens input, $0.14/M tokens output on OpenRouter.

Context window

• Sonar Reasoning Pro: 128,000 tokens
• Phi 4: 16,384 tokens

Price

• Sonar Reasoning Pro: $2/M tokens input, $8/M tokens output
• Phi 4: $0.07/M tokens input, $0.14/M tokens output

Provided by

• Sonar Reasoning Pro: Perplexity
• Phi 4: Microsoft

• Sonar Reasoning Pro model details, providers and pricing
• Phi 4 model details, providers and pricing