Sonar Reasoning Pro
Summary
Sonar Reasoning Pro is a proprietary language model from Perplexity, released on 1 Jan 2024. It accepts text and images and generates text, with a 128K-token context window and up to 4K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $2 per million input tokens and $8 per million output tokens (Perplexity API), across 2 providers we track.
Web-grounded Sonar for multi-step research questions that need cited reasoning
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Perplexity |
|---|---|
| Release date | 1 Jan 2024 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 128K (128,000 tokens) [models.dev] |
| Max output | 4K tokens [models.dev] |
| Knowledge cutoff | 1 Sept 2025 [models.dev] |
| Input | Text and images [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | No [models.dev] |
Sonar Reasoning Pro API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| Perplexity API sonar-reasoning-pro | $2 | $8 | – | 128K | models.dev, 4 Oct 2026 |
| OpenRouter perplexity/sonar-reasoning-pro | $2 | $8 | – | 128K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of Sonar Reasoning Pro?
Sonar Reasoning Pro has a context window of 128,000 tokens (128K) and can generate up to 4,096 tokens in a single response, according to models.dev.
How much does the Sonar Reasoning Pro API cost?
Through Perplexity API, Sonar Reasoning Pro costs $2 per million input tokens and $8 per million output tokens. Prices last verified 4 Oct 2026.
Is Sonar Reasoning Pro open source?
No. Sonar Reasoning Pro is a proprietary model; Perplexity has not released its weights. It is available through APIs including Perplexity API, OpenRouter.
When was Sonar Reasoning Pro released?
Perplexity released Sonar Reasoning Pro on 1 Jan 2024, according to models.dev.
Which providers offer Sonar Reasoning Pro?
We track Sonar Reasoning Pro on 2 providers: Perplexity API, OpenRouter.
Change history
No changes detected since we started tracking this model. We re-check every source daily.