ChatGPT Releases Two "Best-In-Class" Open-Source Models
August 14, 2025
IBL News | New York
OpenAI released two open-weight language models this week, available to download for free and under the Apache 2.0 license on Hugging Face: gpt-oss-120b and gpt-oss-20b. The last open-weight model released by OpenAI was GPT-2, back in 2019.
“These models outperform similarly sized open models on reasoning tasks, demonstrate strong tool use capabilities, and are optimized for efficient deployment on consumer hardware,” said OpenAI CEO Sam Altman.
ā¢ “The gpt-oss-120b model achieves near-parity with OpenAI o4-mini on core reasoning benchmarks, while running efficiently on a single 80 GB GPU.”
ā¢ “The gpt-oss-20b model delivers similar results to OpenAI o3āmini on common benchmarks and can run on edge devices with just 16 GB of memory, making it ideal for on-device use cases, local inference, or rapid iteration without costly infrastructure.”
ā¢ “These models are compatible with our Responses APIā and are designed to be used within agentic workflows with exceptional instruction following, tool use like web search or Python code execution, and reasoning capabilities.”
OpenAI trained the models on a mostly English, text-only dataset, with a focus on STEM, coding, and general knowledge.
Therefore, these new text-only models are not multimodal, but they can browse the web, call cloud-based models to help with tasks, execute code, and navigate software as an AI agent. The smaller of the two models, gpt-oss-20b, is compact enough to run locally on a consumer device with more than 16 GB of memory.
OpenAI defined its release as “best-in-class open models”, highlighting that they work anywhere: locally, on-device, or through third-party inference providers. The company partnered with several deployment platforms such as Azure, Hugging Face, vLLM, Ollama, llama.cpp, LM Studio, AWS, Fireworks, Together AI, Baseten, Databricks, Vercel, Cloudflare, and OpenRouter.
The fact that the “weights” are publicly available means that any developer can peek at the internal parameters to get an idea of how it processes information. They can work as a complement to OpenAI’s paid services. Unlike ChatGPT, you can run a gpt-oss model without an internet connection and behind a firewall.
With Apache 2.0, models can be used for commercial purposes, redistributed, and included as part of other licensed software.
Open-weight model releases from AlibabaāsĀ QwenĀ as well asĀ Mistral, also operate under Apache 2.0.
To try the models, OpenAI released an open model playgroundā , alongside guides.
In the U.S., the open-weight leader has been Meta. The tech giant released the first of its Llama series of models back in 2023, with Metaās most recent release,Ā Llama 4, arriving a few months ago.
Also, the Chinese startup DeepSeek released its cheap-to-run model that was open-weight this year.
ā¢ NVIDIA: OpenAIās New Open Models Accelerated Locally on NVIDIA GeForce RTX and RTX PRO GPUs
