What is the difference between Claude Fable 5.1 and Kimi K3?

Claude Fable 5.1 is developed by Anthropic while Kimi K3 is developed by Moonshot AI. Claude Fable 5.1 has a 1.0M token context window vs Kimi K3'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 Kimi K3?

It depends on your use case. Claude Fable 5.1 and Kimi K3 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 Kimi K3?

Claude Fable 5.1 costs $10/M input tokens and Kimi K3 costs $3/M input tokens. Kimi K3 is $7.00/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 Kimi K3 on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Kimi K3 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 5.1vsKimi K3

Kimi K3 is cheaper than Claude Fable 5.1 at $3/M vs $10/M input tokens.

Claude Fable 5.1 and Kimi K3 compared across 10 shared prompts
Spec	Claude Fable 5.1	Kimi K3
Input price	$10/M tokens	$3/M tokens
Output price	$50/M tokens	$15/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Jul 2026

Our Verdict

Claude Fable 5.1

Kimi K3Runner-up

Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: newer, major provider backing.

Kimi K3 costs 3.3x 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

Kimi K3

Input

$3.00

3.3× cheaper

Output

$15.00

3.3× cheaper

Kimi K3 is cheaper on both: 3.3× input, 3.3× output.

Where to run it

21 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

Kimi K317 hosts

HostInOutContextUptime

InferenceNet$2.10 in$10.95 out1M97.2% up Morphfp8$2.38 in$13.30 out1M99.2% up Relacefp4$2.40 in$12.00 out1M99.2% up Makora$2.55 in$12.75 out1M95.2% up DigitalOcean$2.55 in$12.95 out1M99.5% up Sail Researchfp4$2.65 in$13.28 out1M99.9% up

11 more hosts

Phala$2.70 in$13.50 out1M99.3% up DeepInfrabf16$2.85 in$14.25 out1M97.7% up Wafer$3.00 in$12.75 out1M99.6% up Basetenfp8$3.00 in$15.00 out1M93.5% up Chutesmxfp4$3.00 in$15.00 out1M98.6% up Fireworks$3.00 in$15.00 out1M99.9% up Modalmxfp4$3.00 in$15.00 out1M99.7% up Moonshot AImxfp4$3.00 in$15.00 out1M98.7% up Parasailfp4$3.00 in$15.00 out1M98.9% up Together$3.00 in$15.00 out1M99.5% up Alibaba Cloud$3.45 in$17.25 out1M99.8% up

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

Research

What we learned reading every model

FAQ

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More comparisons

Cost per 1M tokens

21 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Kimi K3?

Which is better, Claude Fable 5.1 or Kimi K3?

How much does Claude Fable 5.1 cost compared to Kimi K3?

How can I compare Claude Fable 5.1 and Kimi K3 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

21 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Kimi K3?

Which is better, Claude Fable 5.1 or Kimi K3?

How much does Claude Fable 5.1 cost compared to Kimi K3?

How can I compare Claude Fable 5.1 and Kimi K3 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages