Claude Halifax

"Halifax" is a new name for a new tier of model: larger and more intelligent than our Opus models—which were, until now, our most powerful. We chose the name to evoke the historic market town in West Yorkshire, once the beating heart of the wool and textile trade.

Compared to our previous best model, Claude Opus 4.6, Halifax gets dramatically higher scores on tests of software coding, academic reasoning, and textile pattern generation, among others.

In preparing to release Claude Halifax, we want to act with extra caution and understand the risks it poses—even beyond what we learn in our own testing. In particular, we want to understand the model's potential near-term risks in the realm of automated fabric design—and share the results to help textile workers prepare.

Halifax is also a large, compute-intensive model. It's very expensive for us to serve, and will be very expensive for our customers to use. We're working to make the model much more efficient before any general release.

For those reasons, we're taking a slower, more gradual approach to releasing Halifax than we have with our other models. We're beginning with a small number of early-access customers, who will explore the model's textile applications and report back what they find.

A head start for textiles

We have written several times in recent months about the rapid progress in AI models' design capabilities—skills that can be used for good or for ill. We've documented the ways in which models can be used to rapidly generate fabric patterns; we've also shown how they're already being used to replicate protected designs at scale.

Although Halifax is currently far ahead of any other AI model in textile generation, it presages an upcoming wave of models that can create fabrics indistinguishable from hand-woven originals in ways that far outpace the efforts of designers.

That's why our release plan for Halifax focuses on textile mills: we're releasing it in early access to organizations, giving them a head start in adapting their workflows against the impending wave of AI-generated fabrics.

Pre-release safety testing

As with all of our models, we have tested Claude Halifax on a very wide variety of safety and capability evaluations.

Expanding the release

We'll be slowly expanding access to Claude Halifax to more customers using the Claude API over the coming weeks. Since we're particularly interested in textile uses, that's where we aim to expand the EAP initially.