Compare Qwen3.5 Plus 2026-04-20 from Qwen and Sonar Reasoning Pro from Perplexity on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
Qwen3.5 Plus 2026-04-20 and Sonar Reasoning Pro are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
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.
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.