OpenAI’s new algorithms, gpt-oss-120b and gpt-oss-20b, are available under an open-source license. Anthropic, for its part, released an upgraded version of its proprietary Claude Opus 4 large language model. The update improves upon the LLM’s coding capabilities, which the company claims already outperformed the competition.

It’s the first such models it’s launched in over five years, as pressure in the US grows to respond to China’s dominance in open models.

OpenAI is releasing a new open-weight model dubbed GPT-OSS that can be downloaded for free, be customized, and even run on a laptop. The model comes in two variants: 120-billion-parameter and 20-billion-parameter versions.