Dao AI Lab

license

BSD-3-Clause(OSI)

source

public

core-gated

ungated

BSD-3-Clause license body confirmed. The repository is public and unarchived and builds the whole product, and the README describes no paid tier, enterprise edition or license-gated build beside it, so source is public and the core ungated.

• https://github.com/Dao-AILab/flash-attention/blob/main/LICENSE recorded 2026-08-18

  LICENSE file is the verbatim BSD-3-Clause text

• https://api.github.com/repos/Dao-AILab/flash-attention recorded 2026-08-18

  Repo metadata - license spdx_id BSD-3-Clause, private false, archived false, default branch main - for Dao-AILab/flash-attention.

• https://github.com/Dao-AILab/flash-attention/blob/main/README.md recorded 2026-08-18

  README describes the official implementation of FlashAttention and FlashAttention-2, IO-aware exact attention, with the papers, benchmarks and Hopper-specific kernels beside it, with no paid tier, enterprise edition or license-key-gated build beside it.