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

OpenAI o3 is developed by OpenAI while Riverflow V2 Fast is developed by Sourceful. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

Which is better, OpenAI o3 or Riverflow V2 Fast?

It depends on your use case. OpenAI o3 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 OpenAI o3 and Riverflow V2 Fast on Rival?

This page shows a side-by-side comparison of OpenAI o3 and Riverflow V2 Fast across shared challenges. You can vote on which model produced the better output, and Pro users can create custom challenges to test both models with their own prompts.

Rival

Updated Feb 2, 2026

OpenAI o3vsRiverflow V2 Fast

2 fights queued

Why OpenAI o3?

Dead even. This one's a coin flip.

Why Riverflow V2 Fast?

10 months newerFeb 2026

OpenAI o3Riverflow V2 Fast

Input price

$10.00/M

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Output price

$40.00/M

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Context

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Released

Apr 2025

Feb 2026

Favorites

OpenAI o3Riverflow V2 Fast

Movie

Blade Runner

19827.9

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City

Kyoto

Japan

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2 / 2

Advanced Investment Memo (IC Memo)financial modeling

Write a pro-level buy-side investment memo with valuation and diligence questions.

OpenAI o3

Openai · Apr 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Riverflow V2 Fast

Sourceful · Feb 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

2 / 2

Mini LBO Underwritefinancial modeling

Build a simplified LBO with returns and sensitivities.

OpenAI o3

Openai · Apr 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Riverflow V2 Fast

Sourceful · Feb 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

2 of 2

Our Verdict

OpenAI o3

Riverflow V2 FastRunner-up

No community votes yet. On paper, OpenAI o3 has the edge — bigger model tier, major provider backing.

Too close to call

Ask them anything yourself

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

Free preview13 of 58 slides

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FAQ

Common questions

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OpenAI o3 vs Riverflow V2 Fast

Which is better, OpenAI o3 or Riverflow V2 Fast?