What is the difference between Claude Fable 5.1 and Kimi K2 Thinking?

Claude Fable 5.1 is developed by Anthropic while Kimi K2 Thinking is developed by Moonshot AI. Claude Fable 5.1 has a 1.0M token context window vs Kimi K2 Thinking's 262K. 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 K2 Thinking?

It depends on your use case. Claude Fable 5.1 and Kimi K2 Thinking 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 K2 Thinking?

Claude Fable 5.1 costs $10/M input tokens and Kimi K2 Thinking costs $0.6/M input tokens. Kimi K2 Thinking is $9.40/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 K2 Thinking on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Kimi K2 Thinking 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 K2 Thinking

Kimi K2 Thinking is cheaper than Claude Fable 5.1 at $0.6/M vs $10/M input tokens.

Claude Fable 5.1 and Kimi K2 Thinking compared across 10 shared prompts
Spec	Claude Fable 5.1	Kimi K2 Thinking
Input price	$10/M tokens	$0.6/M tokens
Output price	$50/M tokens	$2.5/M tokens
Context window	1.0M tokens	262K tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Nov 2025

Our Verdict

Claude Fable 5.1

Kimi K2 ThinkingRunner-up

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

Kimi K2 Thinking 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

Kimi K2 Thinking

Input

$0.60

17× cheaper

Output

$2.50

20× cheaper

Kimi K2 Thinking is cheaper on both: 17× input, 20× output.

Where to run it

6 hosts

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 K2 Thinking2 hosts

HostInOutContextUptime

Google Vertex AI$0.60 in$2.50 out262k99.8% up Novitabf16$0.60 in$2.50 out262k100% up

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

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

6 hosts

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Kimi K2 Thinking?

Which is better, Claude Fable 5.1 or Kimi K2 Thinking?

How much does Claude Fable 5.1 cost compared to Kimi K2 Thinking?

How can I compare Claude Fable 5.1 and Kimi K2 Thinking on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

6 hosts

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Kimi K2 Thinking?

Which is better, Claude Fable 5.1 or Kimi K2 Thinking?

How much does Claude Fable 5.1 cost compared to Kimi K2 Thinking?

How can I compare Claude Fable 5.1 and Kimi K2 Thinking on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages