Introducing Sonnet 4.6
…They often even prefer it to our smartest model from November 2025, Claude Opus 4.5. Performance that would have previously required reaching for an Opus-class model—including on real-world…
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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 4.8LLM-discovered 0 days
…Safeguards Alongside the release of Claude Opus 4.6, we're introducing a new layer of detection to support our Safeguards team in identifying and responding to cyber misuse of Claude. At…
Expanding Project Glasswing
…To support this, we recently released Claude Security , a product that uses our latest public frontier models, like Claude Opus 4.8, to scan codebases and suggest patches. We're also releasing…
Measuring LLMs’ ability to develop exploits
…time-of-release, the performance of models prior to Opus 4.5 follows a log-linear trajectory, with a mean doubling time of 1.1 months. Our models since Opus 4.5…
AI agents find smart contract exploits
…on their release dates throughout the year: Llama 3, GPT-4o, DeepSeek V3, Sonnet 3.7, o3, Opus 4, Opus 4.1, GPT-5, Sonnet 4.5, and Opus 4.5. We…
Building AI for cyber defenders
…This work allowed Claude Sonnet 4.5 to match or eclipse Opus 4.1, our frontier model released only two months prior, in discovering code vulnerabilities and other cyber skills. Adopting and…
Evaluating Claude’s bioinformatics research capabilities with BioMysteryBench
…So what exactly is Claude doing that humans aren’t? Claude’s strategies Analyzing transcripts from Opus 4.6, we identified two primary strategies used by Claude compared to humans: one is…
Natural Language Autoencoders
…We also release an interactive frontend for exploring NLAs on several open models through a collaboration with Neuronpedia . We have also released our code for other researchers to build on. What is…
Emergent introspective awareness in large language models
…We’re not entirely sure why Opus 4 and 4.1 perform so well (note that our experiments were conducted prior to the release of Sonnet 4.5). It could be that…
Anthropic and NEC partner to build AI-native engineering at scale in Japan
…Claude, including Claude Opus 4.7, and Claude Code will be incorporated into NEC BluStellar Scenario , a program that provides consulting, AI tools, security, and digital infrastructure to businesses, starting with its…