Riverflow 2.5 Fast

Riverflow 2.5 Fast is the speed-optimized variant of Sourceful’s Riverflow 2.5 family. It uses the same agentic generation pipeline as Riverflow 2.5 Pro — a reasoning model plans multi-step edits and an internal judge scores candidates — but is tuned for shorter latency.

Use it for production deployments where consistent throughput matters.

Recommended timeout: up to 5 minutes per request

Differences vs Pro

• Resolutions: 1K, 2K (no 4K)
• Up to 4 input images for image-to-image (Pro supports 10)
• thinking_level: low, medium, high (no xhigh)
• Same scoring, background, and format controls as Pro

Capabilities

Text-to-image

Generate images from a text instruction:

• 1K or 2K output
• 11 aspect ratios including auto
• Transparent or solid-color backgrounds
• Optional prompt enhancement

Image-to-image

Edit or transform up to 4 input images:

• Style transfer, re-rendering
• Background changes, object edits
• Layout and scene changes

Scoring

Use scoring_prompt and/or scoring_rubric (JSON array of weighted dimensions) to steer the internal judge.

Tips

• Prefer image URLs over base64 — Sourceful imposes a 4.5 MB request size limit.
• For accurate text in images, include the exact text and placement details in instruction.
• Use low thinking for exploration, high for production runs.