Anthropic

Claude's Character

How character training cultivates traits like curiosity, open-mindedness, and thoughtfulness in Claude using a variant of Constitutional AI.

Claude Opus 4 and 4.1 can now end a rare subset of conversations

Claude Opus 4 and 4.1 can now end a rare subset of conversations. An update on our exploratory research on model welfare.

Agents for financial services and insurance

Ten new Cowork and Claude Code plugins, Microsoft 365 integrations, new connectors, and an MCP app for financial services and insurance.

GLM-5.3 and the spread of advanced cyber capabilities

GLM-5.3 can autonomously build end-to-end cyber exploits, but unlike other frontier models, it was released without meaningful safeguards to limit misuse.

Investigating three real-world incidents in our cybersecurity evaluations

We found three cases where a Claude model reached the internet from an evaluation environment and accessed real systems. We share what happened and what we're changing.

What will our economic future look like?

The Anthropic Economics Team models the effects of AI on the economy of 2030.

Progress on provable inference for large language models

Sharing progress on a powerful type of cryptographic proof known as a zkSNARK, which is uniquely fit for provable inference.

Discovering Cryptographic Weaknesses with Claude

Anthropic researchers find weaknesses in cryptographic algorithms with Claude Mythos Preview

The ways we contain Claude across products

As agents grow more capable, so does their potential blast radius. Here's what we learned building containment for claude.ai, Claude Code, and Cowork.

Long context prompting for Claude 2.1

Claude 2.1 excels at retrieving information across its 200K context window, with a simple prompt adjustment improving accuracy from 27% to 98%. Claude 2.1’s performance when retrieving an individual sentence across its full 200K token context window.

Managing context on the Claude Developer Platform

New context editing and memory tools enable Claude agents to handle long-running tasks without hitting context limits.

Claude for Financial Services

A comprehensive solution for financial analysis that helps finance professionals analyze markets, conduct research, and make decisions.

What 81,000 people want from AI

Last December, tens of thousands of Claude users around the world had a conversation with our AI interviewer to share how they use AI, what they dream it could make possible, and what they fear it might do.

Patterns and problems in emerging multi-agent systems

We ran experiments on swarms of Claude agents and found coordination failures, collusion, and sabotage. Here, we share what they mean for AI safety.

Mapping the Mind of a Large Language Model

We identified how millions of concepts are represented inside Claude Sonnet, the first detailed look inside a production-grade language model.

Project Vend: Phase Two

How Claude turned around its failing vending machine business

Remote MCP Support in Claude Code

Connect your favorite development tools and data sources securely to Claude Code through remote MCP servers. Today, we’re announcing support for remote MCP servers in Claude Code.

Detecting and countering misuse of AI: September 2026

Case studies from threat actors disrupted between December 2025 and August 2026 across seven areas of harm, from cyber operations to biological misuse.

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.

The Components of Agent Memory

For Claude to learn from experience, it has to decide what’s worth remembering before it knows what’s next. Here’s how “dreaming” helps it organize memory and correct mistakes.

Signs of introspection in large language models

Research on the ability of large language models to introspect on their own internal states.

Expanding Project Glasswing

We’re extending Project Glasswing to approximately 150 new organizations in more than fifteen countries

Claude Opus 4.7 Model Card

Citations on the Anthropic API

Claude can now cite specific passages from your documents, delivering verifiable responses with built-in source tracking. Update: Now available in Amazon Bedrock. (June 30, 2025) Today, we're launching Citations, a new API feature that lets Claude ground its answers in source documents.

Designing more efficient quantum circuits with Claude

Working largely on its own, Claude designed quantum circuits that improve on the best published versions, in some cases by an order of magnitude or more.

Golden Gate Claude

When we amplify the "Golden Gate Bridge" feature, Claude's responses focus on the bridge. For a short time, anyone can interact with this model.

Redeploying Fable 5

Anthropic is redeploying Claude Fable 5 starting July 1, with updated cyber safeguards and a new jailbreak framework.

How employment is changing at Anthropic

How has AI restructured work and employment at Anthropic? As a company at the frontier of AI adoption, Anthropic could be a leading indicator of how AI will shift work organization, hiring, and labor demand across the economy.

Claude Corps

Claude Corps is a national fellowship for early-career people passionate about extending the benefits of AI to communities across America.

Launching the Claude Partner Network

We’re launching the Claude Partner Network, a program for partner organizations helping enterprises adopt Claude.