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Models2026-07-18 · source-backed
Starting July 20, Fable 5 is included in all Max and Team Premium plans at 50% of limits, with Pro and Team Standard also getting access, per the @claudeai announcement relayed by Simon Willison. For anyone on Max doing daily agent work, this changes the default model calculus without touching API spend. Fable moving from limited-availability to standing tier lineup also suggests it's out of the "we're not sure about capacity" phase.
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Anthropic published "Redeploying Fable 5" on July 18, and the headline reads like good news until you get to the metering. Fable 5 becomes a permanent subscription feature for Max and Team Premium. Good. But it's metered at 50% of standard weekly limits, meaning every Fable to...
Anthropic shipped Fable 5 on June 9. Willison spent ~5.5 hours stress-testing it: slow and expensive, but it handled everything he threw at it, including agentic coding. (Simon Willison) The tell that it's a real working model and not a benchmark queen: because it post-dated A...
He handed Claude Fable 5, in Claude Code for web, the job of evaluating whether smolvm 1.8.3 could safely run untrusted Python and JavaScript under strict constraints. Verdict: it fits, with hardware-isolated VMs rather than shared-kernel containers, enforced CPU/RAM limits, g...
On June 9, Anthropic released Claude Fable 5 and Mythos 5 across Claude.ai, Claude Code (CLI and web), and Cowork. The spec sheet: 1M-token context, 128K max output, a January 2026 knowledge cutoff, and pricing at $10 input / $50 output per million tokens. That's double Opus 4...
Willison published his AI Engineer World's Fair conversation with Anthropic's Cat Wu and Thariq Shihipar, covering Claude Code, Claude Tag, and Fable. Primary-source practitioner conversation with the people who actually build the thing, rather than secondary coverage of a pre...
Simon Willison surfaced Jarred Sumner's writeup of rewriting Bun's core from Zig to Rust this week, and the numbers stopped me cold. PR #30412, merged May 14, added roughly 1 million lines across 2,188 files, reached 99.8% test compatibility on Linux x64, and shrank the binary...
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