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  5. Qwen3.8 Max PrimevsRiverflow V2 Fast
Updated Sep 2026

Qwen3.8 Max PrimevsRiverflow V2 Fast

Qwen3.8 Max Prime has a larger context window than Riverflow V2 Fast (1.0M tokens vs 8K tokens).

Qwen3.8 Max Prime and Riverflow V2 Fast compared across 2 shared prompts
SpecQwen3.8 Max PrimeRiverflow V2 Fast
Input price$4/M tokens—
Output price$12/M tokens—
Context window1.0M tokens8K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Feb 2026
Our Verdict
Qwen3.8 Max Prime
Qwen3.8 Max Prime
Riverflow V2 Fast
Riverflow V2 FastRunner-up

Not enough votes to call it. On the specs, Qwen3.8 Max Prime has the edge: newer, bigger context window.

Too close to call
API pricing

Cost per 1M tokens

Qwen3.8 Max Prime
Input
$4.00
Output
$12.00
Riverflow V2 Fast
Input
—
Output
—
Where to run it

2 hosts

Qwen3.8 Max Prime1 host
HostInOutContextUptime
Alibaba Cloud$4.00 in·$12.00 out·1M·99.9% up
Riverflow V2 Fast1 host
HostInOutContextUptime
SSourceful$0 in·$0 out·8k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Qwen3.8 Max Prime is developed by Qwen while Riverflow V2 Fast is developed by Sourceful. Qwen3.8 Max Prime 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. Qwen3.8 Max Prime 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 Qwen3.8 Max Prime 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

Qwen3.8 Max Prime logo
Qwen3.8 Max Prime19 outputs, specs and price
Riverflow V2 Fast logo
Riverflow V2 Fast2 outputs, specs and price
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