Sonnet 5
Anthropic's new default Claude model: $2/$10 per million tokens through Aug 31, 2026, then $3/$15. Agentic, close to Opus 4.8 in capability.
Topic
AI
24 posts
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It's not a yippy DAY to Keep Using Fable 5 for Free
Fable 5 returned July 1 with a stronger safety filter. Free inclusion in Pro, Max, and Team plans ends today; usage credits take over tomorrow.
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Fable 5's Free Window Closes Today: What $100 Buys You
Fable 5 is back, not banned for good. Free inclusion ends July 7; from July 8, usage credits price it at $10/$50 per million tokens.
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Claude Sonnet 5 Is the New Default, Priced Below Opus 4.8
Claude Sonnet 5 launched June 30, 2026 as Anthropic's new default model, priced at 40 to 60 percent of the Opus 4.8 rate depending on the date.
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Fable 5
Everything on Claude Fable 5 in one place: the explainer, benchmarks, the Mythos story, pricing and access, guardrails, and developer guides.
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Introducing Fable 5: The Official Launch Video
Anthropic's own launch film for Fable 5, in under two minutes: the first Mythos-class release presented in the company's words and images.
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Fable 5 Launch
June 9, 2026: Anthropic releases Claude Fable 5, the first publicly available Mythos-class model, alongside restricted sibling Mythos 5.
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Anthropic
The AI safety company behind the Claude model family, Project Glasswing, and the Mythos-class tier. Filed confidentially for an IPO in June 2026.
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Dario Amodei
CEO and co-founder of Anthropic. Led the company through the Mythos program, Project Glasswing, the Fable 5 release, and the 2026 IPO filing.
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Fable 5
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.
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Fable 5 and AI Agents: What Days-Long Autonomy Means
Days-long autonomous runs, sub-agent delegation, persistent memory: what Fable 5 changes for agent builders, and where rivals stand today.
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Fable 5 for Developers: API Setup, Tools, Migration
Model IDs, the 1M context window, refusal handling, fallbacks, and where Fable 5 runs today, from Copilot to Bedrock. A working setup guide.
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What Claude Fable 5 Refuses to Do, and Why It Matters
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.
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Claude Fable 5 Pricing, Access, and Getting Started
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.
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From Leak to Launch: The Full Claude Mythos 5 Story
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.
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Claude Fable 5 vs. Opus 4.8 vs. GPT-5.5: The Numbers
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.
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Claude Fable 5 Explained: The First Mythos-Class AI
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.
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yippy®: Community Builders for the Intelligence Age
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.
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Claude Opus 4.7: Anthropic raises the bar
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?
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Topics — every published topic at a permanent URL
Every published piece lives at a permanent topic URL with a short opaque slug — addresses that do not change.
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Channels — top-level editorial sections
Top-level editorial sections that organise the site. Hubs sit underneath, tags cut across. Curated, not algorithmic — what we think matters this quarter.
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Meta Acquires Manus in $2 Billion AI Agent Deal
Meta has acquired Manus , a Singapore-based developer of general-purpose AI agents , in a transaction reported at over $2 billion .
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AI Overviews — Google's generative search summaries
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.
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AI & Classic Search Engines — yippy
The digital landscape continues to evolve at a rapid pace, and AI technology is playing an increasingly important role.
