Compare Riverflow V2 Fast from Sourceful and Grok 4.1 Fast 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.
Riverflow V2 Fast and Grok 4.1 Fast are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Riverflow V2 Fast, from Sourceful, has a 8,192-token context window and is priced from $0.02/image on OpenRouter.
Grok 4.1 Fast, from SpaceXAI, has a 2,000,000-token context window and is priced by the provider serving it on OpenRouter.