Anthropic, on Tuesday, announced a new version of its AI model, the Claude Opus 4.1, just as rival OpenAI is getting close to launching its new GPT-5 model. The Amazon (AMZN)-backed company said the new model will be available to paid Claude users and in Claude Code.

Developers rejoice—OpenAI has just released two new open-weight models. Unlike most of OpenAI’s models, these new products can be downloaded and used without needing to pay API fees to OpenAI. The models can even run locally on laptops and phones.

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.