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The open models don't really match Opus.

For example I regularly do Fable+Opus agentic coding runs over 24 hours without intervention.

I think I've had GLM do a run that was a few hours. That's the closest I've had an open model come on that kind of work.

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Even if they don't match current-day Opus in everything, they do beat 6 month old Opus, which we have no reason to believe it was smaller than the latest version.
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Yes. And Opus goes a very long way compared to Fable, Anthropic isn't doing any favour, it's clearly just 2 models with a very different amount of parameters.
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