Search Anthropic

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 Sonnet 5
Sonnet 5 delivers frontier performance across coding, agents, and professional work at scale.
Emotion concepts and their function in a large language model
All modern language models sometimes act like they have emotions. What’s behind these behaviors? Our interpretability team investigates.
Harness design for long-running application development
Harness design is key to performance at the frontier of agentic coding. Here's how we pushed Claude further in frontend design and long-running autonomous software engineering.
Anthropic acquires Vercept to advance Claude's computer use capabilities
Anthropic has acquired Vercept to strengthen Claude's computer use capabilities.
Introducing Claude Sonnet 4.6
Claude Sonnet 4.6 is a full upgrade of the model’s skills across coding, computer use, long-reasoning, agent planning, knowledge work, and design.
AI models are showing a greater ability to find and exploit vulnerabilities on realistic cyber ranges
In a recent evaluation of AI models’ cyber capabilities, current Claude models can now succeed at multistage attacks on networks with dozens of hosts using only standard, open-source tools, instead of the custom tools needed by previous generations.
Project Vend: Phase two
In June, we revealed that we’d set up a small shop in our San Francisco office lunchroom, run by an AI shopkeeper. It was part of Project Vend, a free-form experiment exploring how well AIs could do on complex, real-world tasks. How has Claude's business been since we last wrote?
Commitments on model deprecation and preservation
We are committing to preserving the weights of all publicly released models, and all models that are deployed for significant internal use.
Advancing Claude for Financial Services
Claude for Financial Services adds a native Excel plugin, real-time market connectors, and skills for modeling, comp analysis, and earnings reports.
Claude for Life Sciences
Discover how Claude accelerates life sciences research with new scientific connectors, skills, and improved performance for drug discovery and clinical work.
Enabling Claude Code to work more autonomously
Claude Code upgrades include a native VS Code extension, terminal UX updates, and checkpoints for autonomous development.
Building AI for cyber defenders
We invested in improving Claude's ability to help defenders detect, analyze, and remediate vulnerabilities in code and deployed systems. This work allowed Claude Sonnet 4.5 to match or eclipse Opus 4.1 in discovering code vulnerabilities and other cyber skills. Adopting and experimenting with AI will be key for defeners to keep pace.
Introducing Claude Sonnet 4.5
Claude Sonnet 4.5 is the best coding model in the world, strongest model for building complex agents, and best model at using computers.
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.
Claude is now generally available in Xcode
Connect your Claude account to Xcode 26 for AI-powered coding assistance. Debug, refactor, and build Apple apps faster with Claude Sonnet 4 by Anthropic.
Detailed cyber evaluations of Claude 4
We partnered with Pattern Labs on a range of cybersecurity evaluations of Claude Opus 4 and Claude Sonnet 4, with Opus demonstrating especially notable improvement over previous models.
Project Vend: Can Claude run a small shop? (And why does that matter?)
We let Claude run a small shop in the Anthropic office. Here's what happened.
Introducing Claude 4
Discover Claude 4's breakthrough AI capabilities. Experience more reliable, interpretable assistance for complex tasks across work and learning.
Reasoning models don't always say what they think
Research from Anthropic on the faithfulness of AI models' chain-of-thought reasoning.