Overview
Sonar Reasoning Pro vs Qwen3.5 Plus 2026-04-20: side-by-side summary
Sonar Reasoning Pro and Qwen3.5 Plus 2026-04-20 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.
Qwen3.5 Plus 2026-04-20, from Qwen, has a 1,000,000-token context window and is priced at $0.30/M tokens input, $1.80/M tokens output on OpenRouter.
- Context window
- Sonar Reasoning Pro: 128,000 tokens
- Qwen3.5 Plus 2026-04-20: 1,000,000 tokens
- Price
- Sonar Reasoning Pro: $2/M tokens input, $8/M tokens output
- Qwen3.5 Plus 2026-04-20: $0.30/M tokens input, $1.80/M tokens output
- Provided by
- Sonar Reasoning Pro: Perplexity
- Qwen3.5 Plus 2026-04-20: Qwen