PyTorch
The framework nearly every modern model is written in.
You're looking at a software record: a tool or platform in the AI stack — who maintains it and what hardware it runs on.
PyTorch won research with Pythonic eager execution, then won production with torch.compile and its distributed stack (FSDP). Born at Meta and governed since 2022 by the PyTorch Foundation under the Linux Foundation, it is the default in which GPT, Llama, Claude-class and most frontier models are implemented — and the reason new chips must run PyTorch before anyone buys them.
Specifications & key facts
Each figure is labeled by basis: vendor spec, vendor claim, reported, estimate, or official. "Not publicly disclosed" means exactly that — we never invent values.
Overview
Sources
Record reviewed as of 2026-01-15 — see Methodology.