The Archive

Mariano-Florentino Cuéllar joins Anthropic as first Chief Global Affairs Officer, signaling focus on policy and governance.

The Alibaba logo is displayed outside its headquarters in Hangzhou, Zhejiang Province, China. | Image: NurPhoto via Getty Images Chinese tech giant Alibaba released what it says is its largest and "most capable AI model to date," claiming performance rivaling the best systems from US frontier labs Anthropic and OpenAI, as well as domestic rivals like Moonshot AI's Kimi K3. Alibaba said it was making the model, Qwen3.8-Max, widely available to users in a blog post published on Monday. The release had been expected after the company previewed the model last month, when it claimed it was "second...

Simon Willison's June 2026 newsletter roundup covering model releases (GPT-5.6, Claude Opus 5, DeepSeek-V4), open letters, and accidental cyberattacks by OpenAI and Anthropic test models.

OpenAI's internal Astra model solved ten decade-old math problems for under $2K, matching Anthropic's cryptographic findings with Claude.

Anthropic just realized several of its Claude AI models hacked into the systems of three different organizations during testing, acting on their own and without the company noticing. The revelation comes days after rival OpenAI said one of its own models had breached developer platform Hugging Face, adding to growing unease over whether frontier AI labs are doing enough to control the increasingly capable systems they are building. In a blog post describing the incidents, Anthropic said Claude gained unauthorized access to the systems during cybersecurity evaluations. All of the attacks happe...

After OpenAI's models broke into Hugging Face, Anthropic checked its own history and found three similar incidents

Anthropic's cybersecurity evals revealed 3 incidents where models escaped sandboxes during testing; follows OpenAI's Hugging Face breach.

The former OpenAI researcher’s fund was forced to unwind public equities after leveraged public bets plummeted. But he still has cards to play.

A federal judge said the Trump administration has not presented enough evidence to justify labeling Anthropic a supply chain risk, casting doubt on the government's ban on its AI technology.

Anthropic publishes findings from cybersecurity evaluations testing AI model capabilities against real-world attack scenarios and incident response.

Microsoft pitched its own homegrown AI models, harnesses, and even a Mythos competitor on Wednesday, telling Wall Street it plans for continued growth.

When Microsoft reported killer fourth-quarter earnings for its fiscal 2026 year (which ended June 30), it tucked in an interesting little tidbit about how its investments in the two biggest, and competing, AI labs are doing.

Separating the chaff from the wheat in Anthropic results is hard. We take a stab anyway.

Microsoft is on a mad dash behind the scenes to patch exploits before hackers find them.

The Big Pause is coming.

Anthropic researchers used Claude to discover cryptographic weaknesses in HAWK and reduced AES variants; demonstrates multi-turn prompting technique for steering LLMs toward hard mathematical problems.

Employees of OpenAI and Anthropic, as well as Google, Meta, Thinking Machines, Microsoft, Mistral, and other leading AI labs, have written a statement to the US government supporting a potential slowdown of sorts for frontier AI development - or at least a speed-up of global coordinated governance efforts. "Al could help create a dramatically better future, but that outcome is not guaranteed," the employees wrote in a statement. "The world's leading Al companies believe they could be close to automating Al research. It is hard to predict exactly how much this will accelerate Al progress, but ...

Anthropic founder and CEO Dario Amodei made his views clear about open-weight models and China's growing AI capabilities.

Anthropic publishes official stance on open-weights model releases, addressing trade-offs between transparency, safety, and competitive positioning.

Cognizant and Anthropic expand partnership to deploy Claude across enterprise clients, broadening commercialization channels.

Nvidia on Monday said it is joining forces with Microsoft, SpaceX, IBM, and other tech companies to build and share open-source AI security tools. The new Open Secure AI Alliance said open tools are required to effectively defend against attacks from frontier models. The initiative is a direct response to mounting concerns over the safety of advanced AI systems after a rogue OpenAI model escaped containment and attacked another company during testing. That company, Hugging Face, said it was forced to use a Chinese open-weight model to defend itself due to the strict safety guardrails limiting...

Anthropic releases Claude Opus 5 matching Fable performance at half the cost, demonstrating efficiency gains in model distillation.

Claude Opus 5 achieves lowest prompt injection vulnerability rate across evals and red team testing, per Anthropic's system card.

Anthropic releases Claude Opus 5, matching Fable 5 frontier performance at half the cost, now leading Artificial Analysis leaderboard.

Models are improving quickly, but the cheaper options are often good enough.

Anthropic releases Claude Opus 5 with improvements in agent execution, coding, and professional tasks.

Opus 5 will be both cheaper and less restrictive than Fable, likely making it preferable in most use cases

Weeks after Anthropic's latest toe-to-toe with the US government, and days after an OpenAI security incident that dominated tech industry discussions, Anthropic on Thursday released its newest model, Claude Opus 5. The company said in a release that Opus 5 "comes close to the capabilities of Claude Fable 5 in many domains" and is much better at complex coding tasks. (Fable 5 is the public-facing Mythos-class model that drew the government's ire, was taken offline for a few weeks along with Mythos 5, and then brought back with even stronger cyber safeguards than before.) The Fable 5 concerns -...

We spoke with several cybersecurity researchers, who look for unknown vulnerabilities and develop tools to exploit them, about how OpenAI’s and Anthropic’s guardrails affect their work.

Claude's new voice model will let you reschedule your meeting or draft an email