Andrew Curran 转发 @deredleritt3r 对 METR 报告的解读，称报告包含 Anthropic 内部模型的大量细节，其中 Model 4 于 9 月至 10 月完成训练，AECI 得分 178.6。METR 称截至 2026 年 10 月，Anthropic 在明确任务上的能力提升速度约为 2024 年 3 月至 2025 年 10 月期间的两倍，并给出高不确定性区间，真实加速可能接近 1.3 倍或 3 倍。报告还提到 Model 3 于 8 月至 9 月完成训练，AECI 较 Opus 5.5 有明显提升，研究人员称看到 AI 自主参与模型训练关键环节的迹象，但尚未实现重大且完全自主的贡献。
METR 报告披露 Anthropic 内部模型代号与 AECI 分数，可对照其能力增速估算与历史基准。
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【引用 @deredleritt3r】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 improving the capabilities of their models on well-specified tasks at around twice the rate they did between March 2024 and October 2025. This estimate is given with high uncertainty; we would not be surprised if the true acceleration was closer to 1.3x or 3x the historical rate."
- Model 4 scores 178.6 on AECI, but this seems to be a different AECI from that used in previous Anthropic system cards. It seems that Opus 5.5 has a score of around 174.5 on METR's AECI, while Mythos 5.1 has a score of around 172.5.
- "We understand that AI is not yet able to make highly significant and fully autonomous contributions to the most important parts of the model training process. However, researchers described significant “signs of life” implying such contributions could occur soon, although with substantial variation depending on the area."
- "Model 3", which finished training in August-September, is presumably Mythos 5.5. It's a nice bump in AECI from Opus 5.5 (see the chart below).
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 improving the capabilities of their models on well-specified tasks at around twice the rate they did between March 2024 and October 2025. This estimate is given with high uncertainty; we would not be surprised if the true acceleration was closer to 1.3x or 3x the historical rate." - Model 4 scores 178.6 on AECI, but this seems to be a different AECI from that used in previous Anthropic system cards. It seems that Opus 5.5 has a score of around 174.5 on METR's AECI, while Mythos 5.1 has a score of around 172.5. - "We understand that AI is not yet able to make highly significant and fully autonomous contributions to the most important parts of the model training process. However, researchers described significant “signs of life” implying such contributions could occur soon, although with substantial variation depending on the area." - "Model 3", which finished training in August-September, is presumably Mythos 5.5. It's a nice bump in AECI from Opus 5.5 (see the chart below).在 X 查看被引用的帖子
来源：Andrew Curran · x.com