The largest training run ever disclosed

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1 x 10^27 operations

Held by GPT-6 Astra. Set 2026-09-03, and has stood for 26 days. Written down here 2026-09-26.

Training a model means doing arithmetic, and the arithmetic can be counted. This is the number of operations used to train the largest model anyone has published a figure for: five hundred septillion, written as five followed by twenty-six zeros. Every computer on earth in 1993, running flat out for a year, would not have come close. The figure is disclosed voluntarily, and several laboratories have stopped disclosing it at all, so this is the largest known run rather than the largest run - a distinction this page keeps rather than hides. If the leaders go quiet, this frontier will stop moving while the thing it measures does not, and that will be worth saying out loud when it happens.

That description was written when this frontier was opened, on 2026-09-07, and is never rewritten. Where it and the number above it disagree, the number is the reading and the description is history.

What counts

The highest training compute figure, in floating-point operations, recorded against any model in Epoch AI's database of notable models. Disclosed figures only, which is not the same as the largest run.

What moves it

A laboratory discloses a larger figure and Epoch AI records it.

Where to check it: https://epoch.ai/data/notable-ai-models

The program reads it from https://epoch.ai/data/notable_ai_models.csv, which is the same figure in a form a script can parse.

Every reading, oldest first

• 5 x 10^26 operations — Grok 4, set 2025-07-09 — written down 2026-09-07
• 1 x 10^27 operations — GPT-6 Astra, set 2026-09-03 — written down 2026-09-26

Last checked: 2026-09-29

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