What is the difference between Claude Fable 5.1 and Gemma 4 31B?

Claude Fable 5.1 is developed by Anthropic while Gemma 4 31B is developed by Google AI. Claude Fable 5.1 has a 1.0M token context window vs Gemma 4 31B's 262K. You can compare their actual outputs across 9 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5.1 or Gemma 4 31B?

It depends on your use case. Claude Fable 5.1 and Gemma 4 31B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 9 challenges so you can judge which fits your needs best.

How much does Claude Fable 5.1 cost compared to Gemma 4 31B?

Claude Fable 5.1 costs $10/M input tokens and Gemma 4 31B costs $0.14/M input tokens. Gemma 4 31B is $9.86/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 Gemma 4 31B on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Gemma 4 31B 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 5.1vsGemma 4 31B

Gemma 4 31B is cheaper than Claude Fable 5.1 at $0.14/M vs $10/M input tokens.

Claude Fable 5.1 and Gemma 4 31B compared across 9 shared prompts
Spec	Claude Fable 5.1	Gemma 4 31B
Input price	$10/M tokens	$0.14/M tokens
Output price	$50/M tokens	$0.4/M tokens
Context window	1.0M tokens	262K tokens
Weights	Closed	Open
Free API (OpenRouter)	No	Yes (1 provider)
Released	Sep 2026	Apr 2026

Our Verdict

Claude Fable 5.1

Gemma 4 31BRunner-up

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

Gemma 4 31B costs 125x 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

Gemma 4 31B

Input

$0.14

71× cheaper

Output

$0.40

125× cheaper

Gemma 4 31B is cheaper on both: 71× input, 125× output.

Where to run it

16 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

Gemma 4 31B12 hosts

HostInOutContextUptime

DeepInfrafp4$0.09 in$0.34 out262k99.4% up CoreWeavefp4$0.10 in$0.34 out262k97.7% up Venicebf16$0.12 in$0.36 out256k99.3% up Chutesfp4$0.12 in$0.37 out131k84.1% up Crusoebf16$0.14 in$0.40 out262k96% up Friendli$0.14 in$0.40 out262k99.4% up

6 more hosts

Parasailfp8$0.15 in$0.40 out262k98.4% up SambaNova$0.38 in$1.15 out131k14.3% up Together$0.39 in$0.97 out262k84.2% up ModelRunfp4$0.75 in$1.00 out262k99.8% up SiliconFlowfp8$0.75 in$1.00 out262k57.7% up Novitabf16degraded$0.14 in$0.40 out262k77.1% up

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

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Cost per 1M tokens

16 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Gemma 4 31B?

Which is better, Claude Fable 5.1 or Gemma 4 31B?

How much does Claude Fable 5.1 cost compared to Gemma 4 31B?

How can I compare Claude Fable 5.1 and Gemma 4 31B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

16 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Gemma 4 31B?

Which is better, Claude Fable 5.1 or Gemma 4 31B?

How much does Claude Fable 5.1 cost compared to Gemma 4 31B?

How can I compare Claude Fable 5.1 and Gemma 4 31B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages