Agentic coding and persistent returns to expertise
…We focus on Claude Code usage through a command-line interface (CLI), Claude.ai , or the Claude Code desktop app. 4 By tracking how agentic coding usage changes as models get more…
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Why does agentic misalignment happen?
Before we started this research, it was not clear where the misaligned behavior was coming from. Our main two hypotheses were: Our post-training process was accidentally encouraging this behavior with misaligned rewards.This behavior was coming from the pre-trained model and our post-training was failing to sufficiently discourage it. We now believe that (2) is largely responsible. Specifically, at the time of Claude 4’s training, the vast majority of our alignment training was standard chat-based Reinforcement Learning from Human Feedback RLHF data that did not include any agentic tool use. T
Teaching Claude whyTop stories
Claude's extended thinking
…agents. Claude 3.7 Sonnet starts off somewhat better, but the difference in performance grows over time as the model continues to interact with the virtual computer. Claude plays Pokémon Together, Claude…
Introducing Claude Opus 4.5
…Alongside Opus, we’re releasing updates to the Claude Developer Platform , Claude Code , and our consumer apps . There are new tools for longer-running agents and new ways to use Claude in…
Experimenting with AI to defend critical infrastructure
…We will continue to look for these complementarities, and welcome the chance to continue working with exceptional institutions like the national labs on our shared mission of ensuring that AI is used…
Harness design for long-running application development
…The agents were run as one continuous session across the whole build, with the Claude Agent SDK 's automatic compaction handling context growth along the way. For this work I built on…
Claude Code auto mode: a safer way to skip permissions
…The classifier sees only user messages and the agent's tool calls; we strip out Claude's own messages and tool outputs, making it reasoning-blind by design. We walk through each…
Anthropic and Amazon expand collaboration for up to 5 gigawatts of new compute
…Anthropic will also use incremental capacity for Claude in Amazon Bedrock. The agreement includes expansion of inference in Asia and Europe to better serve Claude’s growing international customer base. We continue…
Anthropic expands partnership with Google and Broadcom for multiple gigawatts of next-generation compute
…This significant expansion of our compute infrastructure will power our frontier Claude models and help us serve extraordinary demand from customers worldwide. “This groundbreaking partnership with Google and Broadcom is a continuation…
Building a new enterprise AI services company with Blackstone, Hellman & Friedman, and Goldman Sachs
…Systems integrators in the Claude Partner Network lead that work for the world’s largest enterprises today, and we are continuing to invest deeply in those partnerships as Claude reaches more customers…
Eval awareness in Claude Opus 4.6’s BrowseComp performance
…We have updated the model cards for both Claude Opus 4.6 and Claude Sonnet 4.6. For the Opus 4.6 multi-agent configuration described in this report, the run we…