What is the difference between Claude Fable 5 and Z.ai: GLM 5.1?

Claude Fable 5 is developed by Anthropic while Z.ai: GLM 5.1 is developed by Z-ai. Claude Fable 5 has a 1.0M token context window vs Z.ai: GLM 5.1's 203K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5 or Z.ai: GLM 5.1?

It depends on your use case. Claude Fable 5 and Z.ai: GLM 5.1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Claude Fable 5 cost compared to Z.ai: GLM 5.1?

Claude Fable 5 costs $10/M input tokens and Z.ai: GLM 5.1 costs $1.4/M input tokens. Z.ai: GLM 5.1 is $8.60/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 and Z.ai: GLM 5.1 on Rival?

This page shows a side-by-side comparison of Claude Fable 5 and Z.ai: GLM 5.1 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.

What is the difference between Claude Fable 5 and Z.ai: GLM 5.1?

Claude Fable 5 is developed by Anthropic while Z.ai: GLM 5.1 is developed by Z-ai. Claude Fable 5 has a 1.0M token context window vs Z.ai: GLM 5.1's 203K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5 or Z.ai: GLM 5.1?

It depends on your use case. Claude Fable 5 and Z.ai: GLM 5.1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Claude Fable 5 cost compared to Z.ai: GLM 5.1?

Claude Fable 5 costs $10/M input tokens and Z.ai: GLM 5.1 costs $1.4/M input tokens. Z.ai: GLM 5.1 is $8.60/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 and Z.ai: GLM 5.1 on Rival?

This page shows a side-by-side comparison of Claude Fable 5 and Z.ai: GLM 5.1 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.

Claude Fable 5 vs Z.ai: GLM 5.1: Which Is Better?

Updated Jun 2026

Our Verdict

Claude Fable 5

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Claude Fable 5 has the edge — bigger model tier, newer, bigger context window, major provider backing.

Z.ai: GLM 5.1 is 11x cheaper per token — worth considering if cost matters.

Slight edge

API pricing

Cost per 1M tokens

Claude Fable 5

Input

$10.00

Output

$50.00

Z.ai: GLM 5.1

Input

$1.40

7.1× cheaper

Output

$4.40

11× cheaper

Z.ai: GLM 5.1 is cheaper on both — 7.1× input, 11× output

Writing DNA

Style Comparison

Similarity

46%

Claude Fable 5 uses 58.2x more emoji

Claude Fable 5

Z.ai: GLM 5.1

60%Vocabulary54%

22wSentence Length18w

0.49Hedging0.31

4.0Bold3.6

3.5Lists2.6

0.58Emoji0.00

1.09Headings0.43

0.05Transitions0.11

Based on 27 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Z.ai: GLM 5.1 vs MiniMax M3New provider

Z.ai: GLM 5.1 vs GPT-5New provider

Z.ai: GLM 5.1 vs Claude Opus 4.1Cross-provider

Updated Jun 2026

Our Verdict

Claude Fable 5

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Claude Fable 5 has the edge — bigger model tier, newer, bigger context window, major provider backing.

Z.ai: GLM 5.1 is 11x cheaper per token — worth considering if cost matters.

Slight edge

API pricing

Cost per 1M tokens

Claude Fable 5

Input

$10.00

Output

$50.00

Z.ai: GLM 5.1

Input

$1.40

7.1× cheaper

Output

$4.40

11× cheaper

Z.ai: GLM 5.1 is cheaper on both — 7.1× input, 11× output

Writing DNA

Style Comparison

Similarity

46%

Claude Fable 5 uses 58.2x more emoji

Claude Fable 5

Z.ai: GLM 5.1

60%Vocabulary54%

22wSentence Length18w

0.49Hedging0.31

4.0Bold3.6

3.5Lists2.6

0.58Emoji0.00

1.09Headings0.43

0.05Transitions0.11

Based on 27 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Z.ai: GLM 5.1 vs MiniMax M3New provider

Z.ai: GLM 5.1 vs GPT-5New provider

Z.ai: GLM 5.1 vs Claude Opus 4.1Cross-provider