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Claude Fable 5.1 — AI News Today

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Claude Fable 5.1 is Anthropic's September 1, 2026 upgrade to Fable 5, state of the art on coding, knowledge work and long-running agentic problem-solving — 52.6% on Terminal-Bench-Science 0.1 (vs 24.7% for Fable 5), 73.4% on CursorBench 3.2.0 at max effort and 65.0% on Humanity's Last Exam with tools. Generally available on Claude apps, the API, AWS, Google Cloud and Microsoft Azure; a 75% cut in cache-read pricing (to $0.25 per million tokens) makes typical workloads about 25% cheaper than Fable 5.

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251 stories about Claude Fable 5.1

1 from your feedssearching across sources...

About Claude Fable 5.1

Claude Fable 5.1 is a large language model by Anthropic. Claude Fable 5.1 is Anthropic's September 1, 2026 upgrade to Fable 5, state of the art on coding, knowledge work and long-running agentic problem-solving — 52.6% on Terminal-Bench-Science 0.1 (vs 24.7% for Fable 5), 73.4% on CursorBench 3.2.0 at max effort and 65.0% on Humanity's Last Exam with tools. Generally available on Claude apps, the API, AWS, Google Cloud and Microsoft Azure; a 75% cut in cache-read pricing (to $0.25 per million tokens) makes typical workloads about 25% cheaper than Fable 5. This page tracks 251 recent news stories about Claude Fable 5.1, curated from 30+ sources and updated every 15 minutes.

Claude Fable 5.1 — Coverage Momentum

11
This month
↓93%
vs last month
175
All-time
Sep 2026
Peak month
0
0
0
5
159
11
MayJunJulAugSepOct

First tracked Aug 2026. Most-citing sources: Medium (46), r/ClaudeAI (42), r/accelerate (18), Towards AI (11). Data aggregated by Best AI News Today from 30+ sources.

251 stories
1 of 5 Top Stories
Discussions

Gemini 4 Argon scores 165 on the Epoch Capabilities Index (ECI), on par with Fable 5.1 (165) but behind Opus 5.5 (167) and GPT-6 Astra (166).

While behind the ECI frontier, Argon is the closest Google’s come since Gemini 3.1 Pro in Feb, and a big jump from Gemini 3.8 Flash (157). Source: Epoch.ai

r/singularity faviconr/singularity·
Meta has launched Muse Wonder – the company's first GPT-6 Astra and Claude Fable 5.1 level model
Media

Meta has launched Muse Wonder – the company's first GPT-6 Astra and Claude Fable 5.1 level model

Mezha faviconMezha·
How Fable 5.1 Saved Me From Drowning in Operating Systems
Media

How Fable 5.1 Saved Me From Drowning in Operating Systems

by Trey Ditto — I had a sea of new business systems and an agent saying the merge went fine. Here's how I prompted Fable 5.1 to audit it instead.

Medium faviconMedium·
Gemini 4 Argon vs ChatGPT 6 Astra vs Claude Fable 5.1
Media

Gemini 4 Argon vs ChatGPT 6 Astra vs Claude Fable 5.1

Geeky Gadgets faviconGeeky Gadgets·
Discussions

I made a quiz with Claude to test how much AI has gotten into your brain. It’s just a fun side project, but you might enjoy!

I scored 50%. Completely free to play, no tracking or anything. I built this using Claude Code (combination of Opus 5.5 and Fable 5.1) over about a day and a half. Had a lot of fun pushing the style...

r/ClaudeAI faviconr/ClaudeAI·
Fable 5.1 Hits 90% on ARC-AGI-2, and Amodei Asks to Slow Down
Media

Fable 5.1 Hits 90% on ARC-AGI-2, and Amodei Asks to Slow Down

by Batuhan Sener — Three weeks of releases, from August 31 to September 20. ARC Prize verified Anthropic’s Fable 5.1 at 90.0% on ARC-AGI-2, and Dario Amodei…

Medium faviconMedium·
GPT-6 Astra vs Claude Fable 5.1: Which One Actually Codes Better?
Media

GPT-6 Astra vs Claude Fable 5.1: Which One Actually Codes Better?

by PhynixAI — Which codes better? Compare GPT-6 Astra and Claude Fable 5.1 on coding benchmarks, independent agent scores and cost per task before you…

Towards AI faviconTowards AI·
Discussions

Does anyone still use Fable 5.1 these days?

After the release of Opus 5.5, I've almost entirely switched to it. It seems to be very smart, very thorough, works hard, and is so much cheaper than Fable that I can barely overrun the weekly quota...

r/ClaudeAI faviconr/ClaudeAI·
RelatedOpus 5.5
Media

I used Fable 5.1 and GPT-6 Astra to build the same portfolio — the difference was immediately obvious

Same prompt executed very differently ...

XDA Developers on MSN faviconXDA Developers on MSN·
Discussions

Language barrier, shadier terms and jargon fog [D]

Hey all, I don't know if you guys are experiencing the same thing, but there is this behaviour that i have been noticing on the latest models on openAI (since sol 5.6) and Anthropic since Fable 5.1...

r/MachineLearning faviconr/MachineLearning·
ZenMux Launches Claude Fable 5.1 Model Access for Developers
Media

ZenMux Launches Claude Fable 5.1 Model Access for Developers

Kitsap Sun faviconKitsap Sun·
Discussions

Animation supposedly generated by Fable 5.5

Source: Tak 🦞 on X "Hey Fable, please make a cool animation" 15 minutes later. FABLE 5.5 IS SO GOOD AT THESE. HOW??? Fable 5.1 is apparently being rerouted to 5.5 for some people. Still speculation,...

r/singularity faviconr/singularity·
Media

Claude Fable 5.1 Remains Latest Publicly Listed Fable Model

TOKENPOST faviconTOKENPOST·
Media

Livestream coder alleges stolen keys were used to run Fable 5.1 swarms

RuntimeWire faviconRuntimeWire·
Media

Claude Fable 5.1 and Mythos 5.1: Anthropic's New AI Frontier

Intelligent Living faviconIntelligent Living·
Media

GPT-6 Astra vs GPT-6.1 Sol vs Gemini 4 Argon vs Claude Fable 5.1: Which Frontier Model Fits Which Job

MarkTechPost faviconMarkTechPost·
Grok 4.7's input price is one-fifth that of Fable 5.1—behind the low cost, where did the official and third-party figures diverge?
Media

Grok 4.7's input price is one-fifth that of Fable 5.1—behind the low cost, where did the official and third-party figures diverge?

On September 21, xAI released Grok 4.7. The announcement page is lined with phrases like "highest performance" and "same price and speed as the previous version." However, the new model's comparison...

note faviconnote·
GPT-6 Astra vs Gemini 4 Argon vs Claude Fable 5.1: The Benchmark Winner Is the One You Can't Buy
Media

GPT-6 Astra vs Gemini 4 Argon vs Claude Fable 5.1: The Benchmark Winner Is the One You Can't Buy

by Chew Loong Nian - AI ENGINEER — Gemini 4 Argon beats GPT-6 Astra and Claude Fable 5.1 on most of the benchmark table Google published on September 30, and almost nobody…

Towards AI faviconTowards AI·

Frequently Asked Questions

What is Claude Fable 5.1?

Claude Fable 5.1 is Claude Fable 5.1 is Anthropic's September 1, 2026 upgrade to Fable 5, state of the art on coding, knowledge work and long-running agentic problem-solving — 52.6% on Terminal-Bench-Science 0.1 (vs 24.7% for Fable 5), 73.4% on CursorBench 3.2.0 at max effort and 65.0% on Humanity's Last Exam with tools. Generally available on Claude apps, the API, AWS, Google Cloud and Microsoft Azure; a 75% cut in cache-read pricing (to $0.25 per million tokens) makes typical workloads about 25% cheaper than Fable 5.

Where can I access Claude Fable 5.1?

Claude Fable 5.1 is available at https://www.anthropic.com/claude-fable-and-mythos-5-1. It's developed by Anthropic.

What is the latest news about Claude Fable 5.1?

As of today, there are 251 recent stories about Claude Fable 5.1. Recent headlines include: Gemini 4 Argon scores 165 on the Epoch Capabilities Index (ECI), on par with Fable 5.1 (165) but behind Opus 5.5 (167) and GPT-6 Astra (166).; GPT-6 Astra vs Claude Fable 5.1: Which One Actually Codes Better?; Claude Fable 5.1 Remains Latest Publicly Listed Fable Model. Updated every 15 minutes.

What other LLM AI models are there?

Claude Fable 5.1 is part of the LLM model category. Browse all comparable AI llm models with live news mentions and benchmarks.