Haider.(@haider1):anthropic is only about 4 points ahead internally right now it looks like they released opus 5.5 while keeping only mythos 5.5 in-house while openai is holding back the model it trained in august. on Epoch ECI, astra 6.1 already matches fable 5.5 and that's just RL on a 5-month-old astra pre-train

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Haider.@haider1

2026.11.10 02:30

anthropic is only about 4 points ahead internally right now it looks like they released opus 5.5 while keeping only mythos 5.5 in-house while openai is holding back the model it trained in august. on Epoch ECI, astra 6.1 already matches fable 5.5 and that's just RL on a 5-month-old astra pre-train