What is the difference between Claude Fable 5.1 and Inkling?

Claude Fable 5.1 is developed by Anthropic while Inkling is developed by Thinking Machines. Claude Fable 5.1 has a 1.0M token context window vs Inkling'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 Inkling?

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

Claude Fable 5.1 costs $10/M input tokens and Inkling costs $1/M input tokens. Inkling is $9.00/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 Inkling on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Inkling 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 5.1vsInkling

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

Claude Fable 5.1 and Inkling compared across 10 shared prompts
Spec	Claude Fable 5.1	Inkling
Input price	$10/M tokens	$1/M tokens
Output price	$50/M tokens	$4.05/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Open
Free API (OpenRouter)	No	Yes (1 provider)
Released	Sep 2026	Jul 2026

Our Verdict

Claude Fable 5.1

InklingRunner-up

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

Inkling costs 12x 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

Inkling

Input

$1.00

10× cheaper

Output

$4.05

12× cheaper

Inkling is cheaper on both: 10× input, 12× output.

Where to run it

7 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

Inkling3 hosts

HostInOutContextUptime

DeepInfrafp8$0.95 in$4.05 out524k97.4% up Basetenfp8$1.00 in$4.05 out1M79.6% up Together$1.00 in$4.05 out524k98.2% 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

7 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Inkling?

Which is better, Claude Fable 5.1 or Inkling?

How much does Claude Fable 5.1 cost compared to Inkling?

How can I compare Claude Fable 5.1 and Inkling on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

7 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Inkling?

Which is better, Claude Fable 5.1 or Inkling?

How much does Claude Fable 5.1 cost compared to Inkling?

How can I compare Claude Fable 5.1 and Inkling on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages