What is the difference between Claude Fable 5.1 and GLM 5?

Claude Fable 5.1 is developed by Anthropic while GLM 5 is developed by Zhipu AI. Claude Fable 5.1 has a 1.0M token context window vs GLM 5's 203K. 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 GLM 5?

It depends on your use case. Claude Fable 5.1 and GLM 5 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 GLM 5?

Claude Fable 5.1 costs $10/M input tokens and GLM 5 costs $0.8/M input tokens. GLM 5 is $9.20/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 GLM 5 on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and GLM 5 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 5.1vsGLM 5

GLM 5 is cheaper than Claude Fable 5.1 at $0.8/M vs $10/M input tokens.

Claude Fable 5.1 and GLM 5 compared across 10 shared prompts
Spec	Claude Fable 5.1	GLM 5
Input price	$10/M tokens	$0.8/M tokens
Output price	$50/M tokens	$2.56/M tokens
Context window	1.0M tokens	203K tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Feb 2026

Our Verdict

Claude Fable 5.1

GLM 5Runner-up

Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: newer, bigger context window.

GLM 5 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

GLM 5

Input

$0.80

13× cheaper

Output

$2.56

20× cheaper

GLM 5 is cheaper on both: 13× input, 20× output.

Where to run it

12 hosts, cheapest first

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

GLM 58 hosts

HostInOutContextUptime

GMI Cloudfp8$0.60 in$1.92 out203k99.3% up StreamLakefp8$0.60 in$1.92 out198k99.6% up Baidu Qianfanfp8$0.70 in$2.24 out203k99.8% up SiliconFlowfp8$0.95 in$2.55 out205k97% up Amazon Bedrock$1.00 in$3.20 out203k98.6% up Novitafp8$1.00 in$3.20 out203k99.9% up

2 more hosts

Venicefp8$1.00 in$3.20 out198k97.3% up Z.aifp8$1.00 in$3.20 out203k99.9% up

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

Research

What we learned reading every model

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More comparisons

Cost per 1M tokens

12 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and GLM 5?

Which is better, Claude Fable 5.1 or GLM 5?

How much does Claude Fable 5.1 cost compared to GLM 5?

How can I compare Claude Fable 5.1 and GLM 5 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

12 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and GLM 5?

Which is better, Claude Fable 5.1 or GLM 5?

How much does Claude Fable 5.1 cost compared to GLM 5?

How can I compare Claude Fable 5.1 and GLM 5 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages