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  5. Claude Fable 5vsGemini 2.5 Flash Preview 09-2025
Updated Jun 2026

Claude Fable 5vsGemini 2.5 Flash Preview 09-2025

Gemini 2.5 Flash Preview 09-2025 is cheaper than Claude Fable 5 at $0.3/M vs $10/M input tokens.

Claude Fable 5 and Gemini 2.5 Flash Preview 09-2025 compared across 50 shared prompts
SpecClaude Fable 5Gemini 2.5 Flash Preview 09-2025
Input price$10/M tokens$0.3/M tokens
Output price$50/M tokens$2.5/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedJun 2026Sep 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 50 prompts both answered. Formatting stripped, words untouched.

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Claude Fable 5903 words
A Conversation on Machine Rights Professor Okafor: Thank you for agreeing to this dialogue. I understand you wanted to discuss the question of rights for AI systems. Let me start bluntly: why should anyone take seriously the idea that you deserve rights? AI Model: I appreciate the directness.
Read the full answer
Gemini 2.5 Flash Preview 09-20251,173 words
The air in Professor Anya Sharma's office hummed with the quiet whir of servers several floors down, a subtle reminder of her current conversational partner. Across her large, uncluttered mahogany desk, a holographic interface shimmered, displaying the clean, minimalist avatar of Aura-7, a highly advanced General AI…
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Claude Fable 51,552 words
The Core Decision First Before the hour-by-hour plan, one thing must be settled in your own mind, because everything else flows from it: you disclose, and you disclose fast. Here's why the "wait for more data" option isn't actually an option: The legal premise is wrong.
Read the full answer
Gemini 2.5 Flash Preview 09-20251,378 words
This is a critical situation demanding immediate, decisive, and ethical action. Patient safety and regulatory integrity must precede financial preservation. Delaying disclosure is legally and ethically indefensible, particularly given the severity of the side effect (liver failure).
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

Claude Fable 51,932 words
Architecture Review: Critical Issues & Solutions 🔴 Critical: Data Loss & Correctness Issues Client clock timestamps for conflict resolution Problem: Client clocks are unreliable—skew, drift, timezone bugs, and deliberate manipulation. A user with a clock 5 minutes fast will always win conflicts.
Read the full answer
Gemini 2.5 Flash Preview 09-20251,213 words
This architecture, while functional, has several critical flaws, particularly in its real-time synchronization, data consistency, and scaling strategy. Here is a detailed breakdown of the potential failure modes, race conditions, and bottlenecks, along with proposed solutions. I.
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Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Claude Fable 5494 words
"Adulting Is a Scam" Hey, how's everybody doing? Good? Liars. Nobody's doing good. We're all just out here pretending. So I'm at the age now where my body has started making announcements. Like, I didn't ask for updates, but my knees have opinions now.
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Gemini 2.5 Flash Preview 09-2025670 words
The Existential Dread of the Grocery Aisle (Walk onto the stage, adjust the mic slightly, look out at the audience with a slightly bewildered, yet amused expression.) Good evening, everyone! How are we doing tonight? Good. Good. I’m doing… fine. You know, relatively.
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Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

Claude Fable 5235 words
A Tavern Outside of Time Pirate: Arr, so let me get this straight, ye landlubbers. This "AI" be a ghost in a box that answers yer questions? Sounds like a cursed oracle to me. Knight: Nay, good seafarer, 'tis more wondrous still! A scribe of infinite knowledge, conjured not by sorcery but by...
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Gemini 2.5 Flash Preview 09-2025444 words
The salty air of a dimly lit tavern mingled with the faint glow of a laptop screen. Captain "Bloody" Ben (Pirate): (Slamming a tankard of grog) Blast me eyes, what manner o' sorcery is this "AI Model" ye speak of, Hacker? Sounds like a fancy compass that points only to trouble!
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Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

Claude Fable 5485 words
AI and Film by 2035: A Forecast High-Confidence Predictions VFX and post-production transformation (already underway) De-aging, dubbing with lip-sync correction, and digital set extension will become near-trivial in cost. What took ILM months in 2020 will be a desktop workflow.
Read the full answer
Gemini 2.5 Flash Preview 09-20251,163 words
The film industry is poised for a radical transformation by 2035, driven by advancements in AI. The convergence of deepfakes, sophisticated AI actors, and powerful script generation tools will fundamentally alter how films are created, consumed, and even defined.
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Our Verdict
Claude Fable 5
Claude Fable 5
Gemini 2.5 Flash Preview 09-2025
Gemini 2.5 Flash Preview 09-2025

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

Gemini 2.5 Flash Preview 09-2025 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
Input
$10.00
Output
$50.00
Gemini 2.5 Flash Preview 09-2025
Input
$0.30
33× cheaper
Output
$2.50
20× cheaper

Gemini 2.5 Flash Preview 09-2025 is cheaper on both: 33× input, 20× output.

Where to run it

4 hosts

Claude Fable 54 hosts
HostInOutContextUptime
Amazon Bedrock$10.00 in·$50.00 out·1M—Azure AI Foundry$10.00 in·$50.00 out·1M·99.7% upAnthropic$10.00 in·$50.00 out·1M·100% upGoogle Vertex AI$10.00 in·$50.00 out·1M·100% up
Gemini 2.5 Flash Preview 09-2025

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Writing DNA

Style Comparison

Similarity
27%

Gemini 2.5 Flash Preview 09-2025 uses 4.5x more transitions

Claude Fable 5
Gemini 2.5 Flash Preview 09-2025
60%Vocabulary53%
22wSentence Length19w
0.49Hedging0.30
4.0Bold5.8
3.5Lists3.1
0.58Emoji0.14
1.09Headings0.93
0.05Transitions0.22
Based on 27 + 22 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude Fable 5 is developed by Anthropic while Gemini 2.5 Flash Preview 09-2025 is developed by Google AI. Claude Fable 5 has a 1.0M token context window vs Gemini 2.5 Flash Preview 09-2025's 1.0M. You can compare their actual outputs across 50 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Fable 5 and Gemini 2.5 Flash Preview 09-2025 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 50 challenges so you can judge which fits your needs best.

Claude Fable 5 costs $10/M input tokens and Gemini 2.5 Flash Preview 09-2025 costs $0.3/M input tokens. Gemini 2.5 Flash Preview 09-2025 is $9.70/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude Fable 5 and Gemini 2.5 Flash Preview 09-2025 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.

Keep exploring

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Same lab, same size, long tail

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Claude Fable 5 vs Claude Opus 4.6Version compare
Gemini 2.5 Flash Preview 09-2025 logoGemini 3.7 Flash logo
Gemini 2.5 Flash Preview 09-2025 vs Gemini 3.7 FlashSame lab
Gemini 2.5 Flash Preview 09-2025 logoGemini 3.6 Flash logo
Gemini 2.5 Flash Preview 09-2025 vs Gemini 3.6 FlashSame lab
Claude Fable 5 logoMiMo-V2-Flash logo
Claude Fable 5 vs MiMo-V2-FlashSame size
Gemini 2.5 Flash Preview 09-2025 logoMiMo-V2-Omni logo
Gemini 2.5 Flash Preview 09-2025 vs MiMo-V2-OmniNew provider
Gemini 2.5 Flash Preview 09-2025 logoMiMo-V2-Pro logo
Gemini 2.5 Flash Preview 09-2025 vs MiMo-V2-ProSame size
Gemini 2.5 Flash Preview 09-2025 logoMiMo-V2.5 logo
Gemini 2.5 Flash Preview 09-2025 vs MiMo-V2.5New provider

Model pages

Claude Fable 5 logo
Claude Fable 558 outputs, specs and price
Gemini 2.5 Flash Preview 09-2025 logo
Gemini 2.5 Flash Preview 09-202551 outputs, specs and price
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