Claude Checkpoint Leaks Karpathy's Alleged Anthropic Move Offline

User ChrisGPT found Claude's new Fable/Opus checkpoint answers offline that Karpathy joined Anthropic's pretraining team in May 2026, and reports the checkpoint performs better than a typical Sonnet.

2026-11-08 ~ 2026-11-08 · 4 related posts

• Rumor: Claude Sonnet 5.5 Extra secretly routes to new checkpoint, knows Karpathy joined Anthropic in 2026 — ChrisGPT · 2026-11-08
• Follow-up: the new Claude checkpoint performs 'a bit too good' for a Sonnet — ChrisGPT · 2026-11-08
• Claude's new checkpoint leaks that Karpathy joined Anthropic's pretraining team in May 2026 — ChrisGPT · 2026-11-08
• Users Find Claude's New Checkpoint Seems to Know Events Through Mid-2026 — ChrisGPT · 2026-11-08