The Sequence AI of the Week #891: Prompting a Spreadsheet : Inside Google’s TabFM for Tabular AI

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There’s a running joke in machine learning that the field’s most valuable model isn’t a transformer at all — it’s gradient-boosted trees fit on a CSV. For all the noise about frontier models, the workhorses of enterprise ML are still XGBoost pipelines predicting churn, fraud, and credit risk on rows and columns. And the workflow around them has barely changed in a decade: load the table, engineer features, cross-validate, tune hyperparameters, repeat until the AUC stops moving. Every new dataset means starting the ritual over.

Google Research just took direct aim at that ritual. TabFM, released a few days ago, is a foundation model for tabular classification and regression that produces predictions on tables it has never seen, in a single forward pass, with no training, no tuning, and no feature engineering. You hand it the whole problem — training rows, test rows, all of it — as one giant prompt, and it answers. It’s in-context learning, but for spreadsheets. And if the name sounds familiar, it should: this is the same team’s playbook from TimesFM, the time-series foundation model that quietly became one of the most-deployed research artifacts Google has shipped. Understanding TabFM really requires understanding that lineage, so let’s start there.

The TimesFM prelude

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