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  5. Claude Fable 5.1vsQwen3.8 Max Prime
Updated Sep 2026

Claude Fable 5.1vsQwen3.8 Max Prime

Qwen3.8 Max Prime is cheaper than Claude Fable 5.1 at $4/M vs $10/M input tokens.

Claude Fable 5.1 and Qwen3.8 Max Prime compared across 2 shared prompts
SpecClaude Fable 5.1Qwen3.8 Max Prime
Input price$10/M tokens$4/M tokens
Output price$50/M tokens$12/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedSep 2026Sep 2026
Our Verdict
Claude Fable 5.1
Claude Fable 5.1
Qwen3.8 Max Prime
Qwen3.8 Max PrimeRunner-up

Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: bigger model tier, major provider backing.

Qwen3.8 Max Prime costs 4.2x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Fable 5.1
Input
$10.00
Output
$50.00
Qwen3.8 Max Prime
Input
$4.00
2.5× cheaper
Output
$12.00
4.2× cheaper

Qwen3.8 Max Prime is cheaper on both: 2.5× input, 4.2× output.

Where to run it

5 hosts

Claude Fable 5.14 hosts
HostInOutContextUptime
Amazon Bedrock$10.00 in·$50.00 out·1M—Anthropic$10.00 in·$50.00 out·1M·99.9% upAzure AI Foundry$10.00 in·$50.00 out·1M·99.6% upGoogle Vertex AI$10.00 in·$50.00 out·1M·99.9% up
Qwen3.8 Max Prime1 host
HostInOutContextUptime
Alibaba Cloud$4.00 in·$12.00 out·1M·99.9% up

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

Research

What we learned reading every model

FAQ

Common questions

Claude Fable 5.1 is developed by Anthropic while Qwen3.8 Max Prime is developed by Qwen. Claude Fable 5.1 has a 1.0M token context window vs Qwen3.8 Max Prime's 1.0M. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Fable 5.1 and Qwen3.8 Max Prime 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.

Claude Fable 5.1 costs $10/M input tokens and Qwen3.8 Max Prime costs $4/M input tokens. Qwen3.8 Max Prime is $6.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude Fable 5.1 and Qwen3.8 Max Prime 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

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