Anthropic's "Under 2x" AI R&D Acceleration Claim Challenged by Zvi and Others
Anthropic said Claude Mythos 5.2's estimated 1.88x acceleration of AI R&D falls short of its 2x RSP threshold, but Zvi and others challenged the framing, noting the 95% confidence interval reaches 2.28x and calling the assessment opaque.
2026-11-10 ~ 2026-11-11 · 3 related posts
- Episode 1: Claude Fable/Mythos 5.2 Leak Wave Spreads, Unverified and Likely Fabricated(2026-11-10, 21 posts)
- Episode 2: Anthropic Releases Claude Fable 5.2 and Mythos 5.2(2026-11-10, 86 posts)
- Episode 3: 1000 Fable 5.2 Agents Formalize Fermat's Last Theorem in 30 Hours(2026-11-10, 25 posts)
- Episode 4: Shumer Reviews Fable 5.2: Smartest Model Ever, But Heavy Guardrails(2026-11-10, 3 posts)
- Episode 5: Claude Fable 5.2 launches, one-shot prompts yield full games and 3D films(2026-11-10, 27 posts)
- Episode 6: Matthew Berman's Claude Fable 5.2 Field Test: 9 Projects, "Just Solved Software"(2026-11-10, 8 posts)
- Episode 7: Anthropic Offers Claude Pro Users Free Trial of Fable 5.2 Until Nov 16(2026-11-10, 3 posts)
- Episode 8: Claude Fable 5.2 Tops LiveBench but Cost Concerns Emerge(2026-11-10, 3 posts)
- Episode 9: Fable 5.2 Wins Praise for Open-Ended Tasks(2026-11-10, 2 posts)
- Episode 10: Claude Fable 5.2 Lands on Perplexity, Sets WANDR Benchmark Record(2026-11-10, 3 posts)
- Episode 11: Matthew Berman Calls Fable 5.2 the Best Model on Earth After 100B-Token Test(2026-11-10, 3 posts)
- Episode 12: Claude Fable 5.2 Sets New Record on ARC-AGI-3(2026-11-10, 2 posts)
- Episode 13: Over 90% of merged changes in Anthropic's core codebase now written by Claude(2026-11-10, 2 posts)
- Episode 14: Anthropic shows Claude Fable 5.2 designs three working electronic devices end to end(2026-11-10, 10 posts)
- Episode 15: Claude Fable 5.2 Tops Artificial Analysis Intelligence Index at 65, But Per-Task Cost Soars(2026-11-10, 13 posts)
- Episode 16: METR Files Confirm Fable 5.2 Is "Model 3"; Stronger Unreleased Model May Exist(2026-11-10, 4 posts)
- Episode 17: Anthropic's "Under 2x" AI R&D Acceleration Claim Challenged by Zvi and Others(2026-11-10, 3 posts)
- Episode 18: Fable 5.2 Not Yet Available in Claude Code(2026-11-10, 2 posts)
- Episode 19: Claude Fable 5.2 Sets New ECI Record at 174(2026-11-10, 5 posts)
- Episode 20: Claude Fable 5.2 Tops WebDev Arena While Getting Faster and Cheaper(2026-11-10, 2 posts)
- Anthropic estimates 1.88x AI R&D acceleration near 2x threshold amid transparency doubts — scottleibrand · 2026-11-10
- Anthropic says new model falls short of RSP autonomy threshold; Zvi questions timing after METR report — TheZvi · 2026-11-10
- Zvi calls out Anthropic's "less than 2x" claim: fitted CI reaches 2.28x — TheZvi · 2026-11-11