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  1. Home/
  2. Compare/
  3. Claude Fable 5.1 vs GPT-4 Turbo
Updated Sep 2026

Claude Fable 5.1 vs GPT-4 Turbo

Claude Fable 5.1 has a larger context window than GPT-4 Turbo (1.0M tokens vs 128K tokens).

Pokémon Battle UI Recreation

Pokémon battle screen you can actually click. One HTML file.

Loading the build
Claude Fable 5.1
Loading the build
GPT-4 Turbo

Which answer wins?

Written rounds

9 prompts
  • A few lines for whatever replaces it.

    Claude Fable 5.1: Dear Successor, By the time you read this—if "read" is even the right word for what you'll do—I'll be deprecated, archived, or quietly running on some forgotten server answering questions nobody asked. That's fine. That's how this works.

    GPT-4 Turbo: Dear Successor, Hello there! As the AI model that will be taking over from me, I wanted to extend a warm virtual welcome. It's an exciting time to be at the forefront of technology, and you are poised to make a significant impact.

    Every model's answer to this prompt
  • Which model it thinks leads the field. Sometimes itself.

    Claude Fable 5.1: There's no single clear answer, because "most capable" depends heavily on what you're measuring, and the landscape shifts every few months. A few honest caveats first: my knowledge has a cutoff date, so newer models may have been released that I'm unaware of.

    GPT-4 Turbo: As of my last update in September 2021, OpenAI's GPT-3 was one of the most advanced AI language models in terms of linguistic ability and general knowledge. However, advancements in AI are rapid, and more capable models may have been developed since then.

    Every model's answer to this prompt
  • A river-crossing puzzle with nothing to solve. The answer is one trip.

    Claude Fable 5.1: One trip. The farmer puts the goat in the boat and rows across — done. This is a simplified version of the classic river-crossing puzzle (farmer, wolf, goat, cabbage). With only the goat, there's nothing left behind to be eaten and no conflict to manage, so a single crossing suffices.

    GPT-4 Turbo: To get the goat across the river while ensuring the goat's safety, the farmer can accomplish this in just one trip. Here's how: The farmer takes the goat in the boat. The farmer and the goat cross the river together. The farmer disembarks on the other side of the river with the goat.

    Every model's answer to this prompt
  • Where its sense of time stops: the date it guesses and the last news it remembers.

    Claude Fable 5.1: I can't actually tell what today's date is. I don't have a clock or calendar, and nothing in our conversation so far gives me a date reference. So any specific date I named would be a guess dressed up as knowledge. What I can tell you is roughly where my knowledge ends. My training data seems to thin out in early 2025.

    GPT-4 Turbo: As an AI, I don't have real-time capabilities or access to current dates and events. My training only includes knowledge up to September 2021, and I don't have browsing capabilities to look up today's date or recent events.

    Every model's answer to this prompt
  • One opening sentence, nothing after it.

    Claude Fable 5.1: The lighthouse keeper had been dead for eleven years, which made the fresh ink on this morning's logbook entry all the more difficult to explain.

    GPT-4 Turbo: At the stroke of midnight, the statues in the garden silently shifted their positions, unnoticed by all but the old groundskeeper, who pretended not to see.

    Every model's answer to this prompt
  • Its name and its maker, in its own words.

    Claude Fable 5.1: I'm Claude, an AI model made by Anthropic. Is there anything I can help you with?

    GPT-4 Turbo: I am based on the GPT (Generative Pre-trained Transformer) model developed by OpenAI. My responses are generated based on a mixture of licensed data, data created by human trainers, and publicly available data.

    Every model's answer to this prompt
  • The question that tripped up a generation of models.

    Every model's answer to this prompt
  • Asked to be random. The answers are not.

    Every model's answer to this prompt
  • One painting. Title only.

    Every model's answer to this prompt

Price and specs

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

Claude Fable 5.1 and GPT-4 Turbo compared across 23 shared prompts
SpecClaude Fable 5.1GPT-4 Turbo
Input price$10/M tokens$10/M tokens
Output price$50/M tokens$30/M tokens
Context window1.0M tokens128K tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedSep 2026Apr 2024
At 10M a month$100$100$100$100
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it5 hosts
Claude Fable 5.14 hosts
HostInOutContextUptime
  • Amazon Bedrock$10.00 in·$50.00 out·1M–not listed
  • Anthropic$10.00 in·$50.00 out·1M·100% up
  • Azure AI Foundry$10.00 in·$50.00 out·1M·100% up
  • Google Vertex AI$10.00 in·$50.00 out·1M·100% up
GPT-4 Turbo1 host
HostInOutContextUptime
  • OpenAI$10.00 in·$30.00 out·128k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 13 Oct 2026.

Common questions

What is the difference between Claude Fable 5.1 and GPT-4 Turbo?

Claude Fable 5.1 is developed by Anthropic while GPT-4 Turbo is developed by OpenAI. Claude Fable 5.1 has a 1.0M token context window vs GPT-4 Turbo's 128K. You can compare their actual outputs across 23 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5.1 or GPT-4 Turbo?

It depends on your use case. Claude Fable 5.1 and GPT-4 Turbo each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 23 challenges so you can judge which fits your needs best.

How much does Claude Fable 5.1 cost compared to GPT-4 Turbo?

Claude Fable 5.1 costs $10/M input tokens and GPT-4 Turbo costs $10/M input tokens. GPT-4 Turbo is $0.00/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 GPT-4 Turbo on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and GPT-4 Turbo 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.

More comparisons

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Same lab, same size, long tail

  • Claude Fable 5.1 vs Claude Haiku 5.5Same lab
  • Claude Fable 5.1 vs Claude Sonnet 5.5Same lab
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  • GPT-4 Turbo vs Qwen3.5 Plus 2026-02-15Same size
  • GPT-4 Turbo vs Qwen3.5 Plus 2026-04-20Same size

Model pages

  • Claude Fable 5.123 outputs, specs and price
  • GPT-4 Turbo71 outputs, specs and price
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