Anthropic debuts Sonnet 5 for everyday work

Anthropic debuts Sonnet 5 for everyday work

Anthropic is releasing Claude Sonnet 5, a lower-priced model designed to bring more agentic AI capabilities to everyday users without the same cyber-risk profile as its most powerful systems.

Why it matters: The company says Sonnet 5 can handle autonomous tasks — including browser use, planning, coding and knowledge work — while posing fewer dangerous-cyber risks than its Opus and Mythos models.

Zoom in: Anthropic says Sonnet 5 approaches performance of Opus 4.8, its most advanced widely available model, while Mythos and Fable are still restricted.

  • Sonnet 5 was not deliberately trained on cybersecurity tasks and has a "much lower ability" to perform any dangerous cyber activities than Anthropic's current Opus models.
  • Anthropic is in ongoing discussions with the Trump administration over their models and those talks include the release of Sonnet 5.

    • The intrigue: The next generation Sonnet class model arrives while Anthropic is still waiting for government approval to restore full access to its most powerful models.

  • Mythos is now available on a limited basis and Fable 5 is on track to return soon, a source tells Axios.
  • This comes after the government abruptly asked Anthropic to take down these models over security concerns.
  • The administration also asked OpenAI to stagger the release of its most powerful class of models, GPT-5.6.

    • Between the lines: Anthropic — like OpenAI — is betting that its coveted enterprise users will soon use AI less for chat and more for delegating tasks to agents.

  • Last week, OpenAI released data with Columbia, Duke and the University of Pennsylvania showing that non-developers are the fastest-growing user group for its agentic work tool, Codex.

    • Follow the money: Sonnet 5 becomes the default model for all Claude Free and Pro users today, and is also available to Max, Team and Enterprise customers.

  • The company says the model delivers performance approaching Opus 4.8 at a lower price, giving developers a cheaper option for many coding and agentic workloads.
  • This comes amid a renewed focus around AI usage costs that's led some companies and developers to pivot to cheaper Chinese models.

    • The bottom line: The AI labs are still releasing models as the administration figures out which to allow and which to limit.