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Introducing Claude Sonnet 5.5
Claude Sonnet 5.5 is a clear upgrade over Claude Sonnet 5, runs 30%+ faster, and costs up to 30% less for most work.
Introducing Claude Opus 4.8
An upgrade to our Opus class of models, with stronger performance across coding, agentic tasks, and professional work, and the consistency to handle long-running work.
Anthropic acquires Stainless
Anthropic is acquiring Stainless, a leader in SDKs and MCP server tooling.
Higher usage limits for Claude and a compute deal with SpaceX
We’ve raised Claude's usage limits and agreed a new compute partnership with SpaceX that will substantially increase our capacity in the near term.
Agents for financial services
We're releasing ten new Cowork and Claude Code plugins, integrations with the Microsoft 365 suite, new connectors, and an MCP app for financial services and insurance organizations.
Anthropic and Amazon expand collaboration for up to 5 gigawatts of new compute
We have signed a new agreement with Amazon that will deepen our existing partnership and secure up to 5 GW of capacity for training and deploying Claude.
Scaling Managed Agents: Decoupling the brain from the hands
Harnesses encode assumptions that go stale as models improve. Managed Agents—our hosted service for long-horizon agent work—is built around interfaces that stay stable as harnesses change.
Effective harnesses for long-running agents
We developed a two-fold solution to enable the Claude Agent SDK to work effectively across many context windows: an initializer agent that sets up the environment on the first run, and a coding agent that is tasked with making incremental progress in every session while leaving clear artifacts for the next session.
Introducing Claude Opus 4.5
The best model in the world for coding, agents, and computer use, with meaningful improvements to everyday tasks like slides and spreadsheets. Claude Opus 4.5 delivers frontier performance and dramatically improved token efficiency.
Introducing advanced tool use on the Claude Developer Platform
We’ve added three new beta features that let Claude discover, learn, and execute tools dynamically. Here’s how they work.
Claude now available in Microsoft Foundry and Microsoft 365 Copilot
Claude Sonnet 4.5, Haiku 4.5, and Opus 4.1 are now available in Microsoft Foundry, where Azure customers can build production applications and agents.
Introducing Agent Skills
Build custom Skills to teach Claude specialized tasks. Create once, use everywhere—from spreadsheets to coding. Available across Claude.ai, API, and Code.
A postmortem of three recent issues
A technical report on three bugs that intermittently degraded responses from Claude. Below we explain what happened, why it took time to fix, and what we're changing.
Anthropic Economic Index report: Uneven geographic and enterprise AI adoption
We've extended the Anthropic Economic Index along two important dimensions, introducing a geographic analysis of Claude.ai conversations and a first-of-its-kind examination of enterprise API use. We show how Claude usage has evolved over time, how adoption patterns differ across regions, and how firms are deploying frontier AI to solve business problems.
Claude Opus 4.1 is an upgrade over Opus 4 in agentic tasks, real-world coding, and reasoning.
Paul Smith to join Anthropic as Chief Commercial Officer
Anthropic will appoint Paul Smith as its first Chief Commercial Officer, who will assume the role later this year.
Introducing Anthropic's AI for Science Program
We're offering free API credits to researchers working on high-impact scientific projects, with an emphasis on biology and the life sciences.
Introducing Anthropic's first developer conference: Code with Claude
Join us on May 22, 2025 in San Francisco for workshops, labs, and insights on building with the Claude API, CLI tools, and MCP.
Building effective agents
We've worked with dozens of teams building LLM agents across industries. Consistently, the most successful implementations use simple, composable patterns rather than complex frameworks.
Introducing Contextual Retrieval
Contextual retrieval improves how AI systems access and use information, reducing retrieval failures in large knowledge bases.
Claude is now available in Brazil