Anthropic

Open source activity

As of Nov 6, 2026

Anthropic's most recently active public repositories right now are almost entirely about the Claude Code and Cowork ecosystem rather than model research: the official and community plugin marketplaces, the public Agent Skills repository, and a Python SDK for building Claude agents were all touched the same day. That's a visible shift in where the company's open-source energy is going — toward developer tooling and a third-party extension ecosystem, not toward publishing new model architectures or training code.

Two smaller, more specific repos round out the recent activity: an "oss-scanner" security tool and a vertical-specific "financial-services" repository, suggesting Anthropic is also investing in industry reference implementations and open-source dependency-security tooling alongside the general-purpose SDKs and quickstarts. None of this touches Claude's weights or training pipeline directly — as with most frontier labs, the model itself stays closed, and what's public is the surrounding developer surface.

Most active repositories