What is the difference between o3 Mini and Riverflow V2 Fast?

o3 Mini is developed by OpenAI while Riverflow V2 Fast is developed by Sourceful. o3 Mini has a 64K token context window vs Riverflow V2 Fast's 8K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

Which is better, o3 Mini or Riverflow V2 Fast?

It depends on your use case. o3 Mini and Riverflow V2 Fast each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

How can I compare o3 Mini and Riverflow V2 Fast on Rival?

This page shows a side-by-side comparison of o3 Mini and Riverflow V2 Fast across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Feb 2026

o3 MinivsRiverflow V2 Fast

o3 Mini has a larger context window than Riverflow V2 Fast (64K tokens vs 8K tokens).

o3 Mini and Riverflow V2 Fast compared across 2 shared prompts
Spec	o3 Mini	Riverflow V2 Fast
Input price	$1.1/M tokens	—
Output price	$4.4/M tokens	—
Context window	64K tokens	8K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Dec 2024	Feb 2026