Compare Sonar Pro Search from Perplexity and Union Alpha from Stealth on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
Sonar Pro Search and Union Alpha are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Sonar Pro Search, from Perplexity, has a 200,000-token context window and is priced at $3/M tokens input, $15/M tokens output on OpenRouter.
Union Alpha, from Stealth, has a 262,144-token context window and is free to use on OpenRouter.