Andrew Curran on X: "Anthropic has a new internal model that finished training last month. METR refers to it as Model 4 (Anthropic has its own internal codename). It is the highest-scoring model in the set METR analyzed, and it is the first to clear 50% on every benchmark it was tested on." / X
Andrew Curran on X: "Anthropic has a new internal model that finished training last month. METR refers to it as Model 4 (Anthropic has its own internal codename). It is the highest-scoring model in the set METR analyzed, and it is the first to clear 50% on every benchmark it was tested on."
Anthropic has a new internal model that finished training last month. METR refers to it as Model 4 (Anthropic has its own internal codename). It is the highest-scoring model in the set METR analyzed, and it is the first to clear 50% on every benchmark it was tested on.
METR says Anthropic has probably hit the 2x Responsible Scaling Policy acceleration threshold, and may now be running as high as 3x! 'We guess that a majority (perhaps ≈80%) of the current (October 2026) acceleration is due to AI.'
Anthropic has a new internal model that finished training last month. METR refers to it as Model 4 (Anthropic has its own internal codename). It is the highest-scoring model in the set METR analyzed, and it is the first to clear 50% on every benchmark it was tested on.
METR says Anthropic has probably hit the 2x Responsible Scaling Policy acceleration threshold, and may now be running as high as 3x! 'We guess that a majority (perhaps ≈80%) of the current (October 2026) acceleration is due to AI.'
Quoting from the report: 'The plot below shows all benchmark scores for frontier models in the AECI, scaled on a log-odds scale, implying that they should evolve linearly with a model’s latent AECI score (if the logistic assumption holds). The highlighted lines represent the 15Show more
METR's report has a ton of details on Anthropic's internal models, including "Model 4", which finished training in September-October:
- We now know where Anthropic got evidence on the "dramatic acceleration of AI R&D" disclosure. METR: "As of October 2026, Anthropic is likely