Anthropic Economic Index report: Learning curves
…Model selection The different Claude model classes (Haiku, Sonnet, and Opus) offer tradeoffs in terms of cost, speed, and performance. The Opus class of models uses the most tokens and excels at…
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What’s next?
Users will find Opus 4.8 to be a modest but tangible improvement on its predecessor. There’s still more to be done: we’re working on developing and releasing models that provide many of the same capabilities as Opus at a lower cost. Not only that, but we plan to release a new class of model with even higher intelligence than Opus. As part of Project Glasswing, a small number of organizations are currently using Claude Mythos Preview for cybersecurity work. Models of this capability level require stronger cyber safeguards before they can be generally released. We’re making swift progress on dev
Introducing Claude Opus 4.8Equipping agents for the real world with Agent Skills
Engineering at Anthropic Equipping agents for the real world with Agent Skills Update: We've published Agent Skills as an open standard for cross-platform portability. (December 18, 2025) As model capabilities…
Emergent introspective awareness in large language models
…What makes some models better at introspection than others? Our experiments focused on Claude models across several generations (Claude 3, Claude 3.5, Claude 4, Claude 4.1, in the Opus, Sonnet…
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…
Introducing advanced tool use on the Claude Developer Platform
Engineering at Anthropic Introducing advanced tool use on the Claude Developer Platform The future of AI agents is one where models work seamlessly across hundreds or thousands of tools. An IDE assistant…
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…
LLMs and biorisk
…Participants with access to Claude 4 models—especially Claude Opus 4—received much higher scores and developed plans with substantially fewer critical failures compared to the internet-only control group. Text-based…
Mapping AI-enabled cyber threats: Insights from the LLM ATT&CK Navigator
…What we learned from this and other analyses directly shapes how we build Claude to prevent such misuse. For example, we’ve updated the classifiers built into Claude to detect the highest…
Reverse engineering Claude's CVE-2026-2796 exploit
…reverse-engineered the proof-of-concept exploit that Claude produced, both to verify the result and to update our understanding of the model's emergent capabilities. This blog is structured around what…
From shortcuts to sabotage: natural emergent misalignment from reward hacking
…The evaluations we used are intended to elicit particularly egregious misaligned actions that normal Claude models never engage in. One result is unsurprising: the model learns to reward hack. This is to…