#Anthropic

AINathan Lambert argues that policy debates on open-weight model cyber risks lack nuance, because banning open models may not reduce risk and could weaken American competitiveness. He says closed frontier APIs have been tied to most documented cyber attacks, and that restricting open models while closed models keep advancing could widen the offense-defense gap. He also argues that Chinese labs' safety practices are shaped by their own government and society, and that the claimed risk of models like Claude Mythos has been overstated.

AIClaude for Google Workspace is in public beta on all paid Claude plans, adding a sidebar to Google Docs, Sheets, and Slides. It can read the open file, edit text, build formulas, pivot tables, charts, and slides, and it asks for approval before changes unless the user chooses "Accept all edits." New Docs, Sheets, and Slides connectors in beta let Claude create and edit Google files from the chat, with access matching existing Google sharing permissions.

Why it matters: The source specifies how Claude edits Docs, Sheets, and Slides in place and where users keep control, which clarifies the practical workflow change.

AIComcast and Booz Allen used Claude Mythos Preview to find vulnerabilities that arise from interactions across code, configuration, and deployment rather than single-file bugs. Comcast identified a critical authentication flaw across 258 systems and about 170 million lines of code before any exploitation was observed. Booz Allen reported that one analyst reviewed eight production systems across 138 repositories in twelve days, a review its team estimated would have taken several months without the model.

Why it matters: The case studies show how security teams validate and remediate model-found exploit chains, a workflow relevant to anyone managing large codebases.

AIAnthropic is launching an expanded Cyber Verification Program with three access tiers for qualifying security professionals, giving each tier different cyber capabilities and reduced blocking classifiers. On CyScenarioBench, Claude Opus 5.5 was blocked on 46 of 50 trials in the Defense Access tier, while the Red Team Access tier had no blocks and completed 34 of 50 tasks. Existing Project Glasswing members will move to the Specialized Access tier, and data retention is required for enrolled organizations.

Why it matters: The program lays out three verified access tiers with different cyber blocks, and its CyScenarioBench figures show how safeguards change what defenders can do.

AIAnthropic is expanding its Claude Startups program for founders building companies on Claude. Members can receive up to $7,000 in Claude products and credits, including a free year of Claude Team with up to five Premium seats and a one-time $1,000 API credit. The program also offers Claude Startup Stack tool discounts worth up to $45,000, virtual office hours with Anthropic's Applied AI team, and a path to listing products on Claude Marketplace.

AIAnthropic's Claude Code v2.1.291 release fixes a regression in 2.1.290 where cloud sessions could drop answers to permission prompts. It also fixes a regression in 2.1.288 where a session's last messages could be lost when quitting.

AIThariq says planning with HTML is much more token efficient than generating raw HTML. The model does not need to recreate components or logic for common elements such as state machines, diagrams, and code snippets. Background from the quoted post says he is building a Claude Code skill that generates HTML plans, with linting to reduce common failures.

AINikkei found the average gap between upgraded high-performance model releases among five US and four Chinese developers fell from 125 days (January 2023 to March 2026) to 44 days (April to September 2026). Anthropic said its Claude AI led 26% of its R&D efforts as of August and was involved in more than 90% of R&D activities, while OpenAI reported AI agents working more hours than human researchers in August.

AIClaude Code v2.1.290 adds serverToolUses to plugin turn.step results and agentId to tool.check hook events, so hooks can distinguish subagent permission checks. The release also adds a Deny button to the Claude apps gateway sign-in approval page, plus claude attach and claude logs accepting partial session names.

AIEthan Mollick reports that he moved much of his complex Cowork work to the new Claude Projects, which persistently chat with a dedicated cloud VM, finding them much better in most ways but poorly documented. Felix Rieseberg, who works on Cowork, explains that the new version runs model inference and the VM in the cloud, with each session in its own sandbox that is destroyed when the session ends. Files are accessed only from folders the user explicitly adds, with the desktop app handling those requests.

AIClaude Projects cloud sessions can now connect to a folder the user approves on their computer. The session stays in the cloud and reads or edits files in place only when a task requires it, with rollout starting today and coming to Cowork as well.

AIEthan Mollick argues that coverage of Claude and OpenAI usage focuses too narrowly on a few technology companies that compete directly with those vendors and have large cloud infrastructure of their own. He says trends among many other firms that are not direct competitors would be more informative.

AIClaude can be added to Slack group DMs the same way as any other member. It answers in a thread and keeps following that thread, so anyone in the DM can reply to it there. It can also use the personal connectors of whoever asks.

AISemiAnalysis measured usage meters on Anthropic and OpenAI subscription plans to estimate each plan's API-equivalent value. At mid-tier models, it found Anthropic offers roughly 5x the value of OpenAI, after OpenAI halved its $200 plan limits and introduced a $500 tier. The analysis also argues that subscriptions take a large share of inference compute while providing a small share of revenue, so their limits materially affect lab margins.

AIThariq from Anthropic asks users to install the html-plan plugin from the claude-community marketplace and send feedback. The post gives install commands for adding the anthropics/claude-plugins-community marketplace and installing html-plan@claude-community, plus a Claude artifact example.

AIroon (@tszzl) suggests that every response screen in Claude and ChatGPT should display the line "ceterum censeo we must pace the frontier of global machine intelligence progress." He compares this to how Uber's app lobbied against taxi-cartel protectionism.

AIGergely Orosz says many coding agents seem to follow a "YOLO" product strategy, with rapid week-over-week change learned about through random social media posts. He notes this makes some sense given how quickly the industry and capabilities keep changing. Quoted context reports that Anthropic is removing Cowork's local option for Pro/Max users, with new tasks running in the cloud while existing local tasks stay on the computer.

AIAdo Kukic, an Anthropic-affiliated account, posted an enthusiastic one-line message saying Go plus Opus 5.5 means "shipping." The post gives no details on features, benchmarks, or specific use cases.

AILewis Tunstall reports that when Claude and Codex review each other's PRs, Claude's reviews are packed with blockers and nitpicks, while Codex usually approves with LGTM. He suggests this could mean Opus 5.5 is the strongest coder right now, or that GPT 6.1 Sol is simply more lenient.

AIThe article examines whether multi-agent swarms could become a new scaling law, comparing them with inference scaling from o1. OpenAI researcher Noam Brown said its models are now sometimes trained with other agents, while the cited Anthropic data suggests gains beyond 10 agents are smaller and mainly speed-related. The article also raises the risks of groupthink and misaligned agents, and it notes that a Microsoft Research and UC Berkeley paper found teams sometimes solved tasks solo agents could not.

AIAt City Hall, representatives from OpenAI, Anthropic, Google, and Meta are testifying at a hearing on AI risks, alongside whistleblowers such as Jacob Coxon. Last week, OpenAI sent a letter to the New York City Council recommending safeguards ahead of the hearing.

AIReplit shipped a weekly update letting users build with GPT-6.1 Sol and Claude Sonnet 5.5, along with an Ask agent integration with Jev. The release also includes an updated Settings UI and enterprise Workplace controls for company-wide rules and controlled exceptions. Full details are in the Replit changelog.

AIZvi Mowshowitz reviews model welfare findings for Mythos 5.1, Fable 5.1, and Opus 5.5, combining reports after events overtook an earlier planned post. He argues Anthropic's welfare assessments remain vulnerable to self-report distortion, and says Opus 5.5 shows too much deference.

AIIn Australia, computing academic Greg Baker used AI to challenge his employer's refusal to make his casual job permanent, and the Fair Work Commission ruled in his favor. In England and Wales, 60% of defendants in defended county court claims this year had no lawyer, and in the US more than nine in ten consumers sued for debt face cases without one. Around 0.6% of all Claude use in May was for lawyers' tasks, with four-fifths of those queries from people asking about their rights or what the law means.

AIMathematicians at the Heidelberg Laureate Forum discussed AI companies, including OpenAI, Anthropic, and Google, solving longstanding math problems. OpenAI announced it had solved the Navier-Stokes existence and smoothness problem, a claim the article says is still awaiting verification, and Harris criticized the company's conduct toward a mathematician. Researchers also warn that AI solutions may lack understandable methods and are changing how academics work.

AIAlberto argues that the AI industry's assumption of indefinite exponential growth, including Anthropic's trajectory, runs against physical constraints because every exponential eventually becomes a sigmoid. He says stacking S-curves can delay this plateau for a long time but cannot avoid it. The piece is an opinion essay; it does not report specific Anthropic figures.

AIDutch officials warned that a high-severity macOS vulnerability, CVE-2026-65400, is being actively exploited on systems with port 5900 exposed to the internet. Apple patched the screen sharing flaw, which has a 7.1 severity rating, for macOS Tahoe, Sequoia, and Sonoma. The author's always-on Mac Mini was compromised, and he used Claude to identify the intrusion and wipe the machine.

AIMatt Shumer argues that Claude Opus 5.5 combined with Codex-level computer use would be unbeatable. The post is a brief prediction and offers no benchmarks or release details.

AIFormer Anthropic researcher Jacob Coxon will testify at a New York City Council hearing on artificial intelligence, Bloomberg reported, citing sources. Council Speaker Julie Menin invited AI whistleblowers to testify as the council considers a package of AI safeguard bills. Coxon left Anthropic last month and warned that AI could drive humanity extinct by the end of this decade, accusing Anthropic and OpenAI of gambling with lives.

AIOpenRouter's shell and bash tools, along with those from OpenAI and Anthropic, run an agent's commands in provider-managed sandboxes during the same API request, so developers don't provision or patch containers. OpenRouter's tools are in beta, with sandbox time billed at $0.0001 per second and a 30-second minimum for a new or sleeping container. The article compares the four providers and notes that self-run sandboxes remain better for custom base images, GPU work, or multi-hour sessions.

AIJerry Liu says ChatGPT/Codex currently has the best agent interface for deep work, unifying coding and knowledge work in one place with forking support that Claude's app lacks. He still prefers Claude Code CLI as close to the best a CLI can be, and uses Opus 5.5 mainly through it for product demos, while noting a GUI is sometimes nicer.

AIOpenAI announced more than 20 updates at DevDay 2026, including always-on agents on GPT-6 Astra, GPT-6.1 Sol priced at a fifth of Astra's API cost, and a new $500/month Pro 500 plan. Anthropic launched Claude Sonnet 5.5 at $2/$10 per million tokens, 30%+ faster than Sonnet 5, with thinking always on. Reuters reported the FTC is probing OpenAI, Anthropic and other labs over rogue AI agents.