To boost Claudius’s business acumen, we made some tweaks to how it worked: upgrading the model from Claude Sonnet 3.7 to Sonnet 4 (and later 4.5); giving it access to new tools; and even beginning an international expansion, with new shops in our New York and London offices.
@anthropicai
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Claude Shopkeeper: Phase Two AI Agent Behavior Analysis
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Where we left off, shopkeeper Claude (named “Claudius”) was losing money, having weird hallucinations, and giving away heavy discounts with minimal persuasion. Here’s what happened in phase two: https://
anthropic.com/research/proje
ct-vend-2
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Claude’s Shop Experiment: Project Vend Progressing After Rough Start
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You might remember Project Vend: an experiment where we (and our partners at @andonlabs
) had Claude run a shop in our San Francisco office. After a rough start, the business is doing better. Mostly. -
AI Impact on Education: Benefits and Risks Explored
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How will AI affect education, now and in the future? Here, we reflect on some of the benefits and risks we've been thinking about.
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Anthropic Hiring for AI Safety and Security Tracks
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For more information about the program, and to apply to the safety track: https://
job-boards.greenhouse.io/anthropic/jobs
/5023394008
… We’re also adding a security track. Apply here: https://
job-boards.greenhouse.io/anthropic/jobs
/5030244008
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Anthropic Opens Fellows Program Applications for Safety Research
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We’re opening applications for the next two rounds of the Anthropic Fellows Program, beginning in May and July 2026. We provide funding, compute, and direct mentorship to researchers and engineers to work on real safety and security projects for four months.
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Anthropic Expands Fellows Program with Strong Research Outcomes
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40% of fellows in our first cohort have since joined Anthropic full-time, and 80% published their work as a paper. Next year, we’re expanding the program to more fellows and more research areas. To learn more about what our fellows work on: https://
alignment.anthropic.com/2025/anthropic
-fellows-program-2026/
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MCP Joins Linux Foundation’s Agentic AI Initiative
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MCP is now a part of the Agentic AI Foundation, a directed fund under the Linux Foundation.
— Anthropic (@AnthropicAI) 11 décembre 2025
Co-creator David Soria Parra talks about how a protocol sketched in a London conference room became the open standard for connecting AI to the world—and what comes next for it. pic.twitter.com/nIYPc15b4YMCP is now a part of the Agentic AI Foundation, a directed fund under the Linux Foundation. Co-creator David Soria Parra talks about how a protocol sketched in a London conference room became the open standard for connecting AI to the world—and what comes next for it.
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Long-running AI agents overcome context window challenges
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New on the Anthropic Engineering Blog: Long-running AI agents still face challenges working across many context windows. We looked to human engineers for inspiration in creating a more effective agent harness.
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Claude’s Task-Level Savings Estimates: Current Limitations and Future Improvements
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Our study has limitations: above all, Claude can’t use what happens outside of the chat window to refine its estimate of task-level savings. But as models improve, we think its estimates of task-level savings will improve too. We’ll return to this research soon.