Compare FLUX.2 Pro from black-forest-labs and GPT-5.1 Chat from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
FLUX.2 Pro and GPT-5.1 Chat are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
FLUX.2 Pro, from black-forest-labs, has a 46,864-token context window and is priced at $0.03/megapixel on OpenRouter.
GPT-5.1 Chat, from OpenAI, has a 128,000-token context window and is priced by the provider serving it on OpenRouter.