Claude Sonnet 4.5 vs Sonar Pro
Side-by-side specs, pricing and capabilities. Both models run on Clade under one subscription, so you can switch between them in the same conversation.
Claude Sonnet 4.5 comes from Anthropic and Sonar Pro from Perplexity. The practical difference for most people is context, price, and which input types each one accepts.
Claude Sonnet 4.5 holds more in a single conversation — 1M tokens against 128K — which matters for long documents and large codebases.
| Specification | Claude Sonnet 4.5 | Sonar Pro |
|---|---|---|
| Provider | Anthropic | Perplexity |
| Model ID | claude-sonnet-4-5-20250929 | sonar-pro |
| Context window | 1M | 128K |
| Max output | 64K | — |
| Input price | $3.00 / 1M tokens | $3.00 / 1M tokens |
| Output price | $15.00 / 1M tokens | $15.00 / 1M tokens |
| Knowledge cutoff | 2025-01 | — |
| Input types | text, image, file | text, image, file |
| Output types | text | text |
| Plan | Premium | Premium |
Which should you use?
Pick Claude Sonnet 4.5 when…
- You need the larger context window — 1M against 128K.
- You want longer single responses — up to 64K output tokens.
Related comparisons
Try both on Clade
You do not have to choose. One Clade subscription gives you Claude Sonnet 4.5, Sonar Pro, and every other model on the platform.