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Fable 5

Model ● Covered in 26 stories Compare ⇄ + Follow

Fable 5 is Anthropic's flagship AI model that has served as a performance benchmark in the competitive large language model landscape. Recent coverage indicates that Fable 5's position has shifted following the release of Anthropic's Claude Opus 5, which achieves comparable performance at half the cost, while competitors including Moonshot's Kimi K3 and Alibaba's Qwen 3.8 have been positioned relative to Fable 5's capabilities in public announcements and benchmarks.

Updated 3 August 2026

Specifications

No specifications recorded yet.

Latest developments

Opus 5 >> Fable 5 Ben's Bites · 5 days ago · 25

Claude Opus 5: The System Card Zvi (Don't Worry About the Vase) · 1 week ago · 2

[AINews] Claude Opus 5: Fable-level performance at Opus price (half Fable) Latent Space · 1 week ago · 13

Opus 5 costs a third of the price — and that’s actually the problem The New Stack · 1 week ago · 45

Introducing Claude Opus 5 Anthropic News · 26

Anthropic’s Opus 5 is almost Fable 5 The New Stack · 1 week ago · 40

Anthropic launches Opus 5 TechCrunch AI · 1 week ago · 10

Kimi K3: White House alleges Fable 5 siphoning The New Stack · 1 week ago · 31

Timeline

Month Quarter Year

July 2026

Anthropic releases Claude Opus 5 at half the price of Fable 5 with comparable performance Model release

Anthropic releases Claude Opus 5, matching Fable 5 capabilities at half the price Model release

Multiple conflicting podcast episodes report contradictory AI industry developments and announcements Other

Moonshot AI releases Kimi K3, a 2.8 trillion parameter open-weight model achieving frontier-class performance Open source release

Moonshot AI releases Kimi K3 open model with 2.8 trillion parameters and 1-million-token context window Open source release

Sakana AI releases Fugu multi-agent orchestration system Product launch

Moonshot AI releases Kimi K3, a 2.8 trillion-parameter open-weight model competing with frontier American systems Model release

OpenAI releases GPT-5.6 in multiple variants alongside frontier AI model releases from competitors Model release

Fable AI system demonstrates significant performance gains in GPU kernel optimization benchmark Benchmark result

Fable 5 released and achieves top performance on CursorBench benchmark Model release

Anthropic redeployed Fable 5 AI model with enhanced safety restrictions following government export controls Feature update

28 Jul Opus 5 >> Fable 5
25 Jul Claude Opus 5: The System Card
25 Jul [AINews] Claude Opus 5: Fable-level performance at Opus price (half Fable)
24 Jul Opus 5 costs a third of the price — and that’s actually the problem
24 Jul Introducing Claude Opus 5
24 Jul Anthropic’s Opus 5 is almost Fable 5
24 Jul Anthropic launches Opus 5
22 Jul Kimi K3: White House alleges Fable 5 siphoning
21 Jul “Second only to Fable 5:” Alibaba talks the talk with Qwen3.8 without providing any real data
21 Jul LWiAI Podcast #249 - Fable 5 ban, SpaceX Cursor + IPO, OSS Aplenty
20 Jul 📈 Data to start your week
16 Jul Sakana Fugu: One Model to Command Them All
13 Jul datasette code-frequency chart on GitHub
13 Jul Basecamp Bench
10 Jul Fable 5 Vs Opus 4.8: Outcomes-Based Assessments Are A Massive Warning For Frontier AI Labs
9 Jul GPT-5.6 Is Last in 5.x Line, GPT-6 Coming in About a Month
8 Jul The AI Industry Has a Really Dark Secret You're Better Off Not Knowing
7 Jul [AINews] The Field Guide to Fable
2 Jul Fable is back
2 Jul Cursor confirms Fable 5 leads every model on CursorBench
2 Jul Fable 5 will default to Opus 4.8 for coding tasks
2 Jul [AINews] not much happened today
1 Jul Fable is Back: This Safeguard Has Some AI in It!

June 2026

AI industry transitions from interactive chatbots to autonomous agent-based systems as frontier models demonstrate exponential capability improvements Feature update

Trump Administration Negotiates Partial Lifting of Anthropic Model Export Restrictions Policy change

Anthropic discontinues Fable 5 model following US government suspension over jailbreak vulnerability Incident

Relationships

Products & technology

Anthropic develops this model · 10 sources
Integrated with Claude Opus 4.8 · 1 source
Moonshot derived from this model · 1 source
Fable develops this model · 1 source
Cursor deploys this model · 1 source

Competition

Claude Opus 5 competes with this model · 1 source

Regulation

Trump administration regulated by this model · 1 source

The daily briefing

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TLDRocket 3 August 2026

The story of AI in August 2026 is one of consolidation meeting enforcement. Alibaba's Qwen3.8-Max, a 2.4-trillion-parameter mixture-of-experts model with a million-token context window, arrives as a direct challenge to OpenAI and Anthropic's frontier offerings—priced at $2 per million input tokens, it's positioning itself as the capable-and-cheaper alternative that China's AI push has long promised. But the more consequential development is structural: enterprises are finally getting the plumbing to actually deploy these models. June, backed by Salesforce's Marc Benioff, raised $20 million to automate AI integration into legacy systems, scanning corporate infrastructure and generating deployment workflows without expensive consultant fees. This solves what's become clear as the real bottleneck—not model capability, but implementation friction in messy, heterogeneous corporate environments.

Read the full briefing →