What is the difference between Claude Fable 5.1 and Hy4 Preview?

Claude Fable 5.1 is developed by Anthropic while Hy4 Preview is developed by Tencent. Claude Fable 5.1 has a 1.0M token context window vs Hy4 Preview's 1.0M. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5.1 or Hy4 Preview?

It depends on your use case. Claude Fable 5.1 and Hy4 Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

How much does Claude Fable 5.1 cost compared to Hy4 Preview?

Claude Fable 5.1 costs $10/M input tokens and Hy4 Preview costs $0.834/M input tokens. Hy4 Preview is $9.17/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude Fable 5.1 and Hy4 Preview on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Hy4 Preview 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.

Updated Sep 2026

Claude Fable 5.1vsHy4 Preview

Hy4 Preview is cheaper than Claude Fable 5.1 at $0.834/M vs $10/M input tokens.

Claude Fable 5.1 and Hy4 Preview compared across 10 shared prompts
Spec	Claude Fable 5.1	Hy4 Preview
Input price	$10/M tokens	$0.834/M tokens
Output price	$50/M tokens	$2.501/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Sep 2026	Aug 2026

Our Verdict

Claude Fable 5.1

Hy4 Preview

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

Hy4 Preview costs 20x 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

Hy4 Preview

Input

$0.83

12× cheaper

Output

$2.50

20× cheaper

Hy4 Preview is cheaper on both: 12× input, 20× output.

Where to run it

5 hosts

Claude Fable 5.14 hosts

HostInOutContextUptime

Amazon Bedrock$10.00 in$50.00 out1M—Anthropic$10.00 in$50.00 out1M99.1% up Azure AI Foundry$10.00 in$50.00 out1M99.1% up Google Vertex AI$10.00 in$50.00 out1M99.8% up

Hy4 Preview1 host

HostInOutContextUptime

Tencentfp8$0.83 in$2.50 out1M100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

5 hosts

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Hy4 Preview?

Which is better, Claude Fable 5.1 or Hy4 Preview?

How much does Claude Fable 5.1 cost compared to Hy4 Preview?

How can I compare Claude Fable 5.1 and Hy4 Preview on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

5 hosts

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Hy4 Preview?

Which is better, Claude Fable 5.1 or Hy4 Preview?

How much does Claude Fable 5.1 cost compared to Hy4 Preview?

How can I compare Claude Fable 5.1 and Hy4 Preview on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages