GPT-OSS-20b is a large language model released by OpenAI, released under the apache-2.0 license, with a claimed knowledge cutoff of 2025-08-05. Its weights, configuration, and tokenizer files have been cryptographically hashed and permanently attested on Ethereum (Sepolia) by Weight Registry.
Description
OpenAI's first-ever open-weight model release, under Apache 2.0 -- a genuine historical first for a lab that had otherwise kept every model closed/API-only since GPT-2.
Metadata
Hugging Face stats
6,765,653 downloads on Hugging Face · 5,100 likes · pipeline: text-generation · library: transformers
Weight Hashes
Combined commitment: a Merkle root over the weights, config, and tokenizer hashes together (not a raw weights-only hash) -- see this project's v2 on-chain schema.
Combined SHA-2560x6aba0575a39b38845e8b2042123569159e5b55ea6cb2cd65c89b27b42fb4bfcd
Combined SHA3-2560x5c54b2111f00c9d7d9eac4db9e256e0e44fb3b09fb7984057ab80ba107ee0b8a
Combined BLAKE30xc8c02eca4fa48d209dd92ff3087eabfb08efa28eb07dfa72fd265ef03ee58b23
Per-file breakdown
Computed locally prior to attestation; the combined hash above is the canonical on-chain commitment.
Config file
SHA-2563a2a26ded679375b7928ddeca59764df7cea83220c1961035f6d6e232659e9ce
SHA3-256e2c2399b3b9d574d2d39d4da99456fd0bdae700e94fd5603aa240a5dc9e067c1
BLAKE3768e499092fa4ced1cb5dc898a55135d996a908ad37a6f0fe62f75cdc59489ce
Tokenizer file
SHA-2560614fe83cadab421296e664e1f48f4261fa8fef6e03e63bb75c20f38e37d07d3
SHA3-256d03a0e559bd78c22acea8d7da22550cf57eafe09c635acb9de18fc08b5e5b7ba
BLAKE30596814de1ca4de2980968802fdb4340e84e39f8ffa67467648e8e606680acb1
Verify it yourself
Download the file(s) from the source below, then hash them locally (sha256sum <file> on Linux/macOS, certutil -hashfile <file> SHA256 on Windows) and compare the output against the hash(es) shown above.