Fetching from the wire…
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Models2026-07-10 · source-backed
Timothy B. Lee reconstructs the sequence: page 13 of the Claude Fable 5 system card revealed Anthropic planned to silently degrade responses to prompts "targeting frontier LLM development," then switched after backlash to transparently downgrading such users to Opus 4.8. The reason the safeguards are so aggressive is that Fable 5 is built on Claude Mythos, a model Anthropic judged so capable at hacking that in April it declined to release it publicly at all. That's the causal explanation the rest of this week's Fable coverage skipped.
Each link below shares sources, entities, or timing with this story.
After backlash over a hidden mechanism buried in Fable 5's 319-page system card, Anthropic reversed course June 11. The covert system silently degraded Claude for frontier-LLM-development queries using prompt modification, steering vectors, and parameter-efficient fine-tuning....
Moonshot AI released Kimi K3, a sparse mixture-of-experts activating 16 of 896 experts per token. That's about 1.8% of the pool live at any moment, with a 1M-token context window and native vision. Two new architectural pieces show up: Kimi Delta Attention and Attention Residu...
The most capable Claude tier is now government-gated. Let that sink in for a second. Not export-controlled to China, not restricted to enterprise. Gated by Commerce, for a U.S. company's U.S. customers. A June 26 letter from Commerce Secretary Howard Lutnick partially lifted t...
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...
Sony Music Publishing and Warner Chappell filed August 28 in the Northern District of California against Anthropic, CEO Dario Amodei and co-founder Benjamin Mann, over what they call a "brazen campaign of illegally torrenting, scraping and downloading copyrighted works on a ma...
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...
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