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
Anthropic
17 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.