Brett Caughran(@FundamentEdge):Opus 5.5 is pretty insane for Excel read/write I have a few dozen models that are 4-8 quarters out of date. Prior LLMs had gotten better at simple, single quarter updates, but were still sketchy with multi-quarter refreshes (and failed on from scratch builds, to a typical hedge fund standard). Opus is really the first model that can one-shot my Refresh Modeling Skill Pack in a way that passes my Turing test (i.e. I couldn't tell if this was updated by a human or an agent) and passes final validation in a way that I find reliable Exciting progress.

2026.09.23 16:13

Opus 5.5 is pretty insane for Excel read/write I have a few dozen models that are 4-8 quarters out of date. Prior LLMs had gotten better at simple, single quarter updates, but were still sketchy with multi-quarter refreshes (and failed on from scratch builds, to a typical hedge fund standard). Opus is really the first model that can one-shot my Refresh Modeling Skill Pack in a way that passes my Turing test (i.e. I couldn't tell if this was updated by a human or an agent) and passes final validation in a way that I find reliable Exciting progress.

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