What is the difference between Claude Fable 5.1 and Gemini 2.5 Pro Experimental?

Claude Fable 5.1 is developed by Anthropic while Gemini 2.5 Pro Experimental is developed by Google AI. Claude Fable 5.1 has a 1.0M token context window vs Gemini 2.5 Pro Experimental's 1.0M. You can compare their actual outputs across 7 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5.1 or Gemini 2.5 Pro Experimental?

It depends on your use case. Claude Fable 5.1 and Gemini 2.5 Pro Experimental each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 7 challenges so you can judge which fits your needs best.

How much does Claude Fable 5.1 cost compared to Gemini 2.5 Pro Experimental?

Claude Fable 5.1 costs $10/M input tokens and Gemini 2.5 Pro Experimental costs $1/M input tokens. Gemini 2.5 Pro Experimental 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 Gemini 2.5 Pro Experimental on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Gemini 2.5 Pro Experimental 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 5.1vsGemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental is cheaper than Claude Fable 5.1 at $1/M vs $10/M input tokens.

Claude Fable 5.1 and Gemini 2.5 Pro Experimental compared across 7 shared prompts
Spec	Claude Fable 5.1	Gemini 2.5 Pro Experimental
Input price	$10/M tokens	$1/M tokens
Output price	$50/M tokens	$2/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Mar 2025

Our Verdict

Claude Fable 5.1

Gemini 2.5 Pro Experimental

Not enough votes to call it. On the specs, nothing separates them.

Gemini 2.5 Pro Experimental costs 25x 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

Gemini 2.5 Pro Experimental

Input

$1.00

10× cheaper

Output

$2.00

25× cheaper

Gemini 2.5 Pro Experimental is cheaper on both: 10× input, 25× output.

Where to run it

6 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

Gemini 2.5 Pro Experimental2 hosts

HostInOutContextUptime

Google AI Studio$0.63 in$5.00 out1M100% up Google Vertex AI$1.25 in$10.00 out1M97.5% 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, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Gemini 2.5 Pro Experimental?

Which is better, Claude Fable 5.1 or Gemini 2.5 Pro Experimental?

How much does Claude Fable 5.1 cost compared to Gemini 2.5 Pro Experimental?

How can I compare Claude Fable 5.1 and Gemini 2.5 Pro Experimental on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

6 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Gemini 2.5 Pro Experimental?

Which is better, Claude Fable 5.1 or Gemini 2.5 Pro Experimental?

How much does Claude Fable 5.1 cost compared to Gemini 2.5 Pro Experimental?

How can I compare Claude Fable 5.1 and Gemini 2.5 Pro Experimental on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages