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  5. Mercury 2.5 PreviewvsRiverflow V2 Fast
Updated Aug 2026

Mercury 2.5 PreviewvsRiverflow V2 Fast

Mercury 2.5 Preview has a larger context window than Riverflow V2 Fast (260K tokens vs 8K tokens).

Mercury 2.5 Preview and Riverflow V2 Fast compared across 2 shared prompts
SpecMercury 2.5 PreviewRiverflow V2 Fast
Input price$0.04/M tokens—
Output price$0.15/M tokens—
Context window260K tokens8K tokens
Free API (OpenRouter)NoNo
ReleasedAug 2026Feb 2026
Our Verdict
Mercury 2.5 Preview
Mercury 2.5 Preview
Riverflow V2 Fast
Riverflow V2 Fast

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

Too close to call
API pricing

Cost per 1M tokens

Mercury 2.5 Preview
Input
$0.04
Output
$0.15
Riverflow V2 Fast
Input
—
Output
—
Where to run it

2 hosts

Mercury 2.5 Preview1 host
HostInOutContextUptime
Inception$0.04 in·$0.15 out·260k·100% up
Riverflow V2 Fast1 host
HostInOutContextUptime
SSourceful$0 in·$0 out·8k·100% up

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

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What we learned reading every model

FAQ

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Mercury 2.5 Preview is developed by Inception while Riverflow V2 Fast is developed by Sourceful. Mercury 2.5 Preview has a 260K 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.

It depends on your use case. Mercury 2.5 Preview 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.

This page shows a side-by-side comparison of Mercury 2.5 Preview 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.

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Model pages

Mercury 2.5 Preview logo
Mercury 2.5 Preview58 outputs, specs and price
Riverflow V2 Fast logo
Riverflow V2 Fast2 outputs, specs and price
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