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The biggest update in 5 years. v5 brings a modular design, first-class quantization, and a new OpenAI-compatible serving API. Optimized for PyTorch and fully interoperable with the modern AI stack (vLLM, llama.cpp, GGUF).
Transformers v5The backbone of modern AI, re-engineered
Apache 2.0 licensed open-weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases.
OpenAI Open Modelsgpt-oss-120b and gpt-oss-20b open-weight language models