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  5. Riverflow V2 FastvsSonar Pro Search
Updated Feb 2026

Riverflow V2 FastvsSonar Pro Search

Sonar Pro Search has a larger context window than Riverflow V2 Fast (200K tokens vs 8K tokens).

Riverflow V2 Fast and Sonar Pro Search compared across 2 shared prompts
SpecRiverflow V2 FastSonar Pro Search
Input price—$3/M tokens
Output price—$15/M tokens
Context window8K tokens200K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedFeb 2026Oct 2025
Our Verdict
Riverflow V2 Fast
Riverflow V2 Fast
Sonar Pro Search
Sonar Pro Search

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
—
Sonar Pro Search
Input
$3.00
Output
$15.00
Where to run it

2 hosts

Riverflow V2 Fast1 host
HostInOutContextUptime
SSourceful$0 in·$0 out·8k·100% up
Sonar Pro Search1 host
HostInOutContextUptime
Perplexity$3.00 in·$15.00 out·200k·100% up

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 Sonar Pro Search is developed by Perplexity. Riverflow V2 Fast has a 8K token context window vs Sonar Pro Search's 200K. 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 Sonar Pro Search 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 Sonar Pro Search 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
Sonar Pro Search logo
Sonar Pro Search53 outputs, specs and price
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