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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.

www.anthropic.com/claude-fable-and-mythos-5-1
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15 stories about Claude Fable 5.1

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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 15 recent news stories about Claude Fable 5.1, curated from 30+ sources and updated every 15 minutes.

Claude Fable 5.1 — Coverage Momentum

1
This month
↓80%
vs last month
6
All-time
Aug 2026
Peak month
0
0
0
0
5
1
AprMayJunJulAugSep

First tracked Aug 2026. Most-citing sources: r/accelerate (3), The AI Brief (1), r/ClaudeAI (1), Medium (1). Data aggregated by Best AI News Today from 30+ sources.

15 stories
1 of 5 Top Stories
Media

Introducing Claude Fable 5.1 and Claude Mythos 5.1

Anthropic faviconAnthropic·
Discussions

Did Anthropic release Fable 5.1?

I just started doing some work with Claude CLI - the last time I touched it, was 4 days ago, and the difference between then and now is completely insane. I'm kinda flabbergasted. The speed at which...

r/ClaudeAI faviconr/ClaudeAI·
Discussions

Astra possibly dropping tomorrow in anticipation of Fable 5.1

r/accelerate faviconr/accelerate·
Media

GPT-6 and Fable 5.1 Set for August Showdown: Altman Briefs Washington as AI Safety Boundaries Face Renewed Scrutiny

finance.biggo.com faviconfinance.biggo.com·
Vibe check: Fable 5.1—Anthropic is so back (again)
Media

Vibe check: Fable 5.1—Anthropic is so back (again)

by Katie Parrott and Dan Shipper in Vibe Check Anthropic is so back. The company just released Fable 5.1, the successor to the model we called the best coder in the world, Fable 5. After lackluster...

Every on MSN faviconEvery on MSN·
Related Anthropic
Fable 5.1 This Week? Gemini 4 And GPT 6? What Can We Expect
Media

Fable 5.1 This Week? Gemini 4 And GPT 6? What Can We Expect

by Cas — At the top of the model market, the gap has become almost absurdly small. Artificial Analysis currently scores Claude Opus 5 at 63, Claude…

The AI Brief faviconThe AI Brief·
Discussions

Are models going forward going to be gate kept inside the labs like what was stated in Ai 2027?

From what I hear Fable 5.1 or Model 2 or Astra are available but the Ai labs aren’t releasing them. Is this the track we’re going down now? A handicapped version or not releasing it at all until...

r/accelerate faviconr/accelerate·
Discussions

Where is ASTRA/FABLE 5.1/Gemini 4 ?????

It’s alrdy end of August and we still haven’t gotten any of those models . Sama and the other president guy saying we gonna get AGI by the end of the year ( internally atleast ) but I’ll need some...

r/accelerate faviconr/accelerate·
Media

Breaking News: Fable 5.1 Officially Enters Grayscale Release Phase

eu.36kr.com faviconeu.36kr.com·
Media

Breaking News: Fable 5.1 Leaked & Claude Suffers Massive Global Outage

eu.36kr.com faviconeu.36kr.com·

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 15 recent stories about Claude Fable 5.1. Recent headlines include: Anthropic upgrades Claude with new Fable 5.1 model, details here; Introducing Claude Fable 5.1 and Claude Mythos 5.1; Vibe check: Fable 5.1—Anthropic is so back (again). 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.