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  5. Riverflow V2 FastvsSolar Pro 3
Updated Feb 2026

Riverflow V2 FastvsSolar Pro 3

Solar Pro 3 has a larger context window than Riverflow V2 Fast (128K tokens vs 8K tokens).

Riverflow V2 Fast and Solar Pro 3 compared across 2 shared prompts
SpecRiverflow V2 FastSolar Pro 3
Input price—Free
Output price—Free
Context window8K tokens128K tokens
Free API (OpenRouter)NoNo
ReleasedFeb 2026Jan 2026
Our Verdict
Riverflow V2 Fast
Riverflow V2 Fast
Solar Pro 3
Solar Pro 3

Not enough votes to call it. On the specs, nothing separates them.

Too close to call
API pricing

Cost per 1M tokens

Riverflow V2 Fast
Input
—
Output
—
Solar Pro 3
Input
$0.000
Output
$0.000
Where to run it

1 host

Riverflow V2 Fast1 host
HostInOutContextUptime
SSourceful$0 in·$0 out·8k·100% up
Solar Pro 3

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Riverflow V2 Fast is developed by Sourceful while Solar Pro 3 is developed by Upstage. Riverflow V2 Fast has a 8K token context window vs Solar Pro 3's 128K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

It depends on your use case. Riverflow V2 Fast and Solar Pro 3 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.

This page shows a side-by-side comparison of Riverflow V2 Fast and Solar Pro 3 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.

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Model pages

Riverflow V2 Fast logo
Riverflow V2 Fast2 outputs, specs and price
Solar Pro 3 logo
Solar Pro 339 outputs, specs and price
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