What is the difference between Andromeda Alpha and Claude Fable 5.1?

Andromeda Alpha is developed by OpenRouter while Claude Fable 5.1 is developed by Anthropic. Andromeda Alpha has a 128K token context window vs Claude Fable 5.1's 1.0M. You can compare their actual outputs across 3 challenges on Rival to see how they differ in practice.

Which is better, Andromeda Alpha or Claude Fable 5.1?

It depends on your use case. Andromeda Alpha and Claude Fable 5.1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 3 challenges so you can judge which fits your needs best.

How much does Andromeda Alpha cost compared to Claude Fable 5.1?

Andromeda Alpha costs $0/M input tokens and Claude Fable 5.1 costs $10/M input tokens. Andromeda Alpha is $10.00/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 Andromeda Alpha and Claude Fable 5.1 on Rival?

This page shows a side-by-side comparison of Andromeda Alpha and Claude Fable 5.1 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

Andromeda AlphavsClaude Fable 5.1

Andromeda Alpha is cheaper than Claude Fable 5.1 at $0/M vs $10/M input tokens.

Andromeda Alpha and Claude Fable 5.1 compared across 3 shared prompts
Spec	Andromeda Alpha	Claude Fable 5.1
Input price	Free	$10/M tokens
Output price	Free	$50/M tokens
Context window	128K tokens	1.0M tokens
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Oct 2025	Sep 2026

Our Verdict

Claude Fable 5.1

Andromeda AlphaRunner-up

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

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Andromeda Alpha

Input

$0.000

Output

$0.000

Claude Fable 5.1

Input

$10.00

Output

$50.00

Where to run it

4 hosts

Andromeda Alpha

No hosts listed on OpenRouter.

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

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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Cost per 1M tokens

4 hosts

What we learned reading every model

Common questions

What is the difference between Andromeda Alpha and Claude Fable 5.1?

Which is better, Andromeda Alpha or Claude Fable 5.1?

How much does Andromeda Alpha cost compared to Claude Fable 5.1?

How can I compare Andromeda Alpha and Claude Fable 5.1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

4 hosts

What we learned reading every model

Common questions

What is the difference between Andromeda Alpha and Claude Fable 5.1?

Which is better, Andromeda Alpha or Claude Fable 5.1?

How much does Andromeda Alpha cost compared to Claude Fable 5.1?

How can I compare Andromeda Alpha and Claude Fable 5.1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages