Google Releases TimesFM-3: A 330M Multivariate Time Series Foundation Model

Balance- · reddit · 2026-09-04

Google Research released TimesFM-3, a 330M-parameter zero-shot time series foundation model whose headline change is native multivariate forecasting — multiple targets, past-only covariates, and past-future covariates (holidays, planned promotions) without fine-tuning.

Architecture

• Decoder-only Transformer, 20 layers, dim 1280, 16 heads, 32 timesteps patched per token
• Alternating attention per layer: causal across time within a series, full attention across series at each timestep
• One-forward-pass forecasting: masked placeholder tokens for the whole horizon are filled simultaneously; outputs 9 quantiles (P10–P90) per target per step

Pretraining & results

• Trained on GiftEvalPretrain, Wikipedia pageviews (to Nov 2023), Google Trends (to end 2022) plus synthetic data — over 1 trillion time points
• Best average rank on Gift-Eval and FEV-Bench vs Chronos-2, Toto 2.0, TimesFM-2.5; univariate-only mode already matches or beats baselines

Caveat: weights ship under the non-commercial TimesFM license — not production-ready. PyTorch weights are on Hugging Face and GitHub; BigQuery integration coming later.

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