Compare Union Alpha from Stealth and Grok 4.6 from SpaceXAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
Union Alpha and Grok 4.6 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Union Alpha, from Stealth, has a 262,144-token context window and is free to use on OpenRouter.
Grok 4.6, from SpaceXAI, has a 500,000-token context window and is priced at $2/M tokens input, $6/M tokens output on OpenRouter.