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  5. Muse Spark 1.3vsRiverflow V2 Fast
Updated Sep 2026

Muse Spark 1.3vsRiverflow V2 Fast

Muse Spark 1.3 has a larger context window than Riverflow V2 Fast (1.0M tokens vs 8K tokens).

Muse Spark 1.3 and Riverflow V2 Fast compared across 2 shared prompts
SpecMuse Spark 1.3Riverflow V2 Fast
Input price$1.25/M tokens—
Output price$4.25/M tokens—
Context window1.0M tokens8K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Feb 2026
Our Verdict
Muse Spark 1.3
Muse Spark 1.3
Riverflow V2 Fast
Riverflow V2 FastRunner-up

Not enough votes to call it. On the specs, Muse Spark 1.3 has the edge: newer, bigger context window, major provider backing.

Too close to call
API pricing

Cost per 1M tokens

Muse Spark 1.3
Input
$1.25
Output
$4.25
Riverflow V2 Fast
Input
—
Output
—
Where to run it

2 hosts

Muse Spark 1.31 host
HostInOutContextUptime
Meta$1.25 in·$4.25 out·1M·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.

Research

What we learned reading every model

FAQ

Common questions

Muse Spark 1.3 is developed by Meta AI while Riverflow V2 Fast is developed by Sourceful. Muse Spark 1.3 has a 1.0M 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. Muse Spark 1.3 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 Muse Spark 1.3 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

Muse Spark 1.3 logo
Muse Spark 1.358 outputs, specs and price
Riverflow V2 Fast logo
Riverflow V2 Fast2 outputs, specs and price
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