What is the difference between Claude Fable 5.1 and DeepSeek V3.1?

Claude Fable 5.1 is developed by Anthropic while DeepSeek V3.1 is developed by DeepSeek. Claude Fable 5.1 has a 1.0M token context window vs DeepSeek V3.1's 164K. 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 DeepSeek V3.1?

It depends on your use case. Claude Fable 5.1 and DeepSeek V3.1 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 DeepSeek V3.1?

Claude Fable 5.1 costs $10/M input tokens and DeepSeek V3.1 costs $0.2/M input tokens. DeepSeek V3.1 is $9.80/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 DeepSeek V3.1 on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and DeepSeek V3.1 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.

Updated Sep 2026

Claude Fable 5.1vsDeepSeek V3.1

DeepSeek V3.1 is cheaper than Claude Fable 5.1 at $0.2/M vs $10/M input tokens.

Claude Fable 5.1 and DeepSeek V3.1 compared across 10 shared prompts
Spec	Claude Fable 5.1	DeepSeek V3.1
Input price	$10/M tokens	$0.2/M tokens
Output price	$50/M tokens	$0.8/M tokens
Context window	1.0M tokens	164K tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Aug 2025

Our Verdict

Claude Fable 5.1

DeepSeek V3.1Runner-up

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

DeepSeek V3.1 costs 63x 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

DeepSeek V3.1

Input

$0.20

50× cheaper

Output

$0.80

63× cheaper

DeepSeek V3.1 is cheaper on both: 50× input, 63× 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

DeepSeek V3.18 hosts

HostInOutContextUptime

DeepInfrafp4$0.25 in$0.95 out164k100% up Novitafp8$0.27 in$1.00 out131k99.8% up SiliconFlowfp8$0.27 in$1.00 out164k97.4% up AtlasCloudfp8$0.30 in$0.95 out131k99.3% up CoreWeavefp8$0.55 in$1.65 out161k100% up Mara$0.60 in$1.70 out131k86.6% up

2 more hosts

SambaNovafp8$0.65 in$1.50 out131k93.3% up Google Vertex AIdegraded$0.60 in$1.70 out164k0% 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

12 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and DeepSeek V3.1?

Which is better, Claude Fable 5.1 or DeepSeek V3.1?

How much does Claude Fable 5.1 cost compared to DeepSeek V3.1?

How can I compare Claude Fable 5.1 and DeepSeek V3.1 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 DeepSeek V3.1?

Which is better, Claude Fable 5.1 or DeepSeek V3.1?

How much does Claude Fable 5.1 cost compared to DeepSeek V3.1?

How can I compare Claude Fable 5.1 and DeepSeek V3.1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages