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Fable 5

Model ● Covered in 37 stories + Follow

Fable 5 is an Anthropic model referenced in multiple recent reports, including discussions of its performance versus other frontier systems and its role in coding/agent workflows. Coverage also notes Fable 5’s token usage and spending share in Anthropic billing-data snapshots, and that it is included in Anthropic’s Enterprise Frontier Safeguards program as an initial model with data retention options starting with a 30-day period. In export-control-related reporting, Fable 5 (along with Mythos 5) is specifically cited as subject to U.S. nationals-only access restrictions.

Updated 14 September 2026

Specifications

No specifications recorded yet.

Latest developments

Exclusive: Paying for frontier AI models buys 4-month head start at 5x the cost Ars Technica · 2 days ago · 46
GPT-6-Astra Can Do Ambitious Things Zvi (Don't Worry About the Vase) · 4 days ago · 14 Introducing Fugu Max and Fugu Ultra v2: Orchestrating the Pareto Frontier Sakana AI · 44 ASEAN can still hedge between America and China on AI. It needs to get its act together first Fortune · 26
Artificial Analysis benchmarks GPT-6 Astra vs other agent models Artificial Analysis · 1 week ago · 17 August newsletter is out Simon Willison’s Weblog · 1 week ago · 19 Developing Enterprise Frontier Safeguards with our customers Anthropic · 14 Anthropic’s best AI model struggles to attract users as cheaper tools thrive Simon Willison’s Weblog · 3 weeks ago · 44

Timeline

Month Quarter Year

September 2026

OpenAI released GPT-6 Astra, a new model positioned as a major upgrade over prior generations, with specified per-token input and output pricing Model release

Sakana AI releases Fugu Max and Fugu Ultra v2 multi-agent orchestration models via a hosted, OpenAI-compatible API Model release

US NSA, CISA, and FBI issued an advisory accusing six Chinese AI firms of bulk distillation of capabilities from US frontier models Security issue

OpenAI released GPT-6 Astra, its flagship AI model, along with evaluation results, a system card, and related updates to how the model is benchmarked and priced Model release

Anthropic announced Enterprise Frontier Safeguards (EFS) to add customer-controlled zero data retention and automated misuse detection for its frontier models Feature update

August 2026

Anthropic reported a sharp increase in quarterly revenue and reached an annualized revenue run rate of about $65 billion ahead of its planned IPO Other

OpenAI, Google, and DeepSeek released new AI models, alongside price cuts for newly released models by OpenAI and Anthropic Model release

Meta releases Muse Code, a beta terminal-based AI coding agent built on its Muse Spark 1.2 model Product launch

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 released Kimi K3, an open-weight large language model 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

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

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