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GPT-5 Pro vs Riverflow V2 Fast Preview: side-by-side summary

GPT-5 Pro and Riverflow V2 Fast Preview are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5 Pro, from OpenAI, has a 400,000-token context window and is priced at $15/M tokens input, $120/M tokens output on OpenRouter.

Riverflow V2 Fast Preview, from Sourceful, has a 8,192-token context window and is priced by the provider serving it on OpenRouter.

Context window
  • GPT-5 Pro: 400,000 tokens
  • Riverflow V2 Fast Preview: 8,192 tokens
Price
  • GPT-5 Pro: $15/M tokens input, $120/M tokens output
  • Riverflow V2 Fast Preview: Pricing varies by provider
Provided by
  • GPT-5 Pro: OpenAI
  • Riverflow V2 Fast Preview: Sourceful
  • GPT-5 Pro model details, providers and pricing
  • Riverflow V2 Fast Preview model details, providers and pricing