Sonar Reasoning Pro combines the deepest web retrieval in the Sonar family with chain-of-thought reasoning to return well-sourced, structured answers within a context window of 127K tokens.
import { streamText } from 'ai'
const result = streamText({ model: 'perplexity/sonar-reasoning-pro', prompt: 'Why is the sky blue?'})Sonar Reasoning Pro is the full search-augmented reasoning stack from Perplexity. It combines the deep, multi-source web retrieval of Sonar Pro with chain-of-thought reasoning, producing answers that are both broadly sourced and logically structured.
Perplexity describes benchmark results and search modes for this model in its announcement. See https://sonar.perplexity.ai for methodology, pricing context, and product details.
The practical impact shows up on hard research questions. Queries that require reconciling conflicting sources, reasoning about implications of recent developments, or building a structured argument from scattered web evidence use both retrieval breadth and reasoning depth. The model searches more sources than Sonar Reasoning, applies more deliberation, and returns longer, more structured responses. The context window of 127K tokens supports extended research sessions where accumulated context from prior turns informs later searches and reasoning.