What is the difference between Claude Fable 5.1 and Gemini 3 Flash Preview?

Claude Fable 5.1 is developed by Anthropic while Gemini 3 Flash Preview is developed by Google AI. Claude Fable 5.1 has a 1.0M token context window vs Gemini 3 Flash Preview'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 Gemini 3 Flash Preview?

It depends on your use case. Claude Fable 5.1 and Gemini 3 Flash Preview 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 Gemini 3 Flash Preview?

Claude Fable 5.1 costs $10/M input tokens and Gemini 3 Flash Preview costs $0.5/M input tokens. Gemini 3 Flash Preview is $9.50/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 3 Flash Preview on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Gemini 3 Flash Preview 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 3 Flash Preview

Gemini 3 Flash Preview is cheaper than Claude Fable 5.1 at $0.5/M vs $10/M input tokens.

Claude Fable 5.1 and Gemini 3 Flash Preview compared across 10 shared prompts
Spec	Claude Fable 5.1	Gemini 3 Flash Preview
Input price	$10/M tokens	$0.5/M tokens
Output price	$50/M tokens	$3/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Dec 2025

Our Verdict

Claude Fable 5.1

Gemini 3 Flash PreviewRunner-up

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

Gemini 3 Flash Preview costs 17x 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 3 Flash Preview

Input

$0.50

20× cheaper

Output

$3.00

17× cheaper

Gemini 3 Flash Preview is cheaper on both: 20× input, 17× 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

Gemini 3 Flash Preview2 hosts

HostInOutContextUptime

Google Vertex AI$0.50 in$3.00 out1M97.1% up Google AI Studio$0.50 in$3.00 out1M99.9% 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 Gemini 3 Flash Preview?

Which is better, Claude Fable 5.1 or Gemini 3 Flash Preview?

How much does Claude Fable 5.1 cost compared to Gemini 3 Flash Preview?

How can I compare Claude Fable 5.1 and Gemini 3 Flash Preview 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 Gemini 3 Flash Preview?

Which is better, Claude Fable 5.1 or Gemini 3 Flash Preview?

How much does Claude Fable 5.1 cost compared to Gemini 3 Flash Preview?

How can I compare Claude Fable 5.1 and Gemini 3 Flash Preview on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages