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METR's review of Anthropic's R&D acceleration shows an independent audit is not the same as public evidence

METR spent about 11 weeks assessing Anthropic, with permission to view some internal material, and concluded that Anthropic is improving its models at roughly twice its earlier pace. That conclusion could be published. But METR says a majority of the evidence it found most informative was redacted by Anthropic. Readers can review the published methods, results and robustness checks, but that is not the same as being able to recompute them independently; for the rest, it comes down to how far you trust the evaluator's judgment.

Long readEditorial8 min read

Anthropic's FlashProve can prove which model wrote a response. Here is how far the research prototype gets

When you call a model API, you have no way to confirm the model answering is the one you pay for. FlashProve, a research prototype the Anthropic Frontier Red Team published on November 2, 2026, has the provider commit to its weights and attach a proof to each response that you can check on a CPU. What it proves is solid. The limits are many: it checks one greedily decoded token, it runs on Llama 4 Maverick rather than Claude, and proving costs 70 to 95 times the GPU time of ordinary inference.

Long readEditorial5 min read