Fable 5
Everything on Claude Fable 5 in one place: the explainer, benchmarks, the Mythos story, pricing and access, guardrails, and developer guides.
20 posts
The AI safety company behind the Claude model family, Project Glasswing, and the Mythos-class tier. Filed confidentially for an IPO in June 2026.
CEO and co-founder of Anthropic. Led the company through the Mythos program, Project Glasswing, the Fable 5 release, and the 2026 IPO filing.
Anthropic's first Mythos-class model as a product: $10 per million input tokens, $50 output, 1M context. The premium tier for long-horizon work.
Days-long autonomous runs, sub-agent delegation, persistent memory: what Fable 5 changes for agent builders, and where rivals stand today.
Model IDs, the 1M context window, refusal handling, fallbacks, and where Fable 5 runs today, from Copilot to Bedrock. A working setup guide.
Fable 5 ships with classifiers that reroute risky queries to Opus 4.8. Here is what gets blocked, what does not, and why Anthropic did it.
Fable 5 costs $10 per million input tokens and $50 for output. Here is who gets it, what the June 22 window means, and when to pick it.
A leaked draft, a security program with NATO on the partner list, and an IPO filing: the road to Claude Fable 5 was anything but quiet.
Fable 5 posts 80.3% on SWE-Bench Pro against 69.2 for Opus 4.8 and 58.6 for GPT-5.5. We ran the price-per-point math so you do not have to.
Anthropic just shipped its first Mythos-class model to the public. Here is what Fable 5 can do, what it costs, and why it is a new tier.
yippy® is the flagship of the community, where the Intelligence Age meets real life. AI, biology, robots, and the good life, made useful, human, and fun.
Anthropic today released its most powerful publicly available model. The benchmark results are impressive, and the communication is more transparent than that of its competitors. But is there a catch you should be aware of before upgrading?
Every published piece lives at a permanent topic URL with a short opaque slug — addresses that do not change.
Top-level editorial sections that organise the site. Hubs sit underneath, tags cut across. Curated, not algorithmic — what we think matters this quarter.
Meta has acquired Manus , a Singapore-based developer of general-purpose AI agents , in a transaction reported at over $2 billion .
Google's introduction of "AI Overviews" in search results marks a significant shift in how information is accessed on the internet. These AI-generated summaries aim to answer user queries directly within the search results page, bypassing the need for users to visit external websites.
The digital landscape continues to evolve at a rapid pace, and AI technology is playing an increasingly important role.