Sonar Pro Search vs Step 3.5 Flash: side-by-side summary

Sonar Pro Search and Step 3.5 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Sonar Pro Search, from Perplexity, has a 200,000-token context window and is priced at $3/M tokens input, $15/M tokens output on OpenRouter.

Step 3.5 Flash, from stepfun, has a 262,144-token context window and is priced at $0.10/M tokens input, $0.30/M tokens output on OpenRouter.

Context window

• Sonar Pro Search: 200,000 tokens
• Step 3.5 Flash: 262,144 tokens

Price

• Sonar Pro Search: $3/M tokens input, $15/M tokens output
• Step 3.5 Flash: $0.10/M tokens input, $0.30/M tokens output

Provided by

• Sonar Pro Search: Perplexity
• Step 3.5 Flash: stepfun

• Sonar Pro Search model details, providers and pricing
• Step 3.5 Flash model details, providers and pricing