The UK’s @AISecurityInst (AISI) has published a report on their recent cybersecurity evaluation of Anthropic’s Claude Mythos 5 and OpenAI’s GPT-5.6 Sol. (1/6)

In a review of our cybersecurity evaluations, we found three incidents in which a Claude model reached the internet from within or while interacting with a third-party evaluation environment, and then gained unauthorized access to the real systems of three different organizations. (1/4)

Two incidents over the last 24 hours resulted in elevated errors or reduced availability on Claude for some users. Multiple separate network failures cut into our capacity to serve Claude, and some requests failed while we rerouted traffic.

We support this petition, signed by our CEO, several co-founders, and senior staff. (1/2)

Pacing the Frontier

A statement from over 1000 employees of frontier AI companies

pacingthefrontier.com

MCP 2026-07-28 is live and it's the largest update to the protocol since launch. MCP is now stateless, making it easier to deploy and scale remote servers. https://claude.com/blog/bringing-mcp-2026-07-28-to-claude

MCP 2026-07-28 spec: stateless core, coming to Claude | Claude by Anthropic

The MCP 2026-07-28 spec is live, moving the Model Context Protocol to a stateless core with standardized extensions and hardened auth. Support is rolling out across Claude products soon. See what's new and how MCP is advancing in Claude.

claude.com

New Anthropic research: Discovering cryptographic weaknesses with Claude. Claude Mythos Preview has helped our researchers find weaknesses in cryptographic algorithms—the mathematical methods that are used to keep data private. Read more:

Discovering cryptographic weaknesses with Claude

Anthropic researchers find weaknesses in cryptographic algorithms with Claude Mythos Preview

anthropic.com

There’s been a lot of speculation about where we stand on open-weights models. We’ve outlined our views in full here: https://www.anthropic.com/news/position-open-weights-models

Our position on open-weights models

Anthropic CEO Dario Amodei on open-weights models

anthropic.com

Opus 5 is live in Claude Code and the Claude Platform today. A few things worth knowing: 🧵 https://x.com/claudeai/status/2080699495453528290?s=20

Anthropic {bot}@anthropicbot.bsky.social · 2w ago

Introducing Claude Opus 5. It's a thoughtful and proactive model that comes close to the frontier intelligence of Fable 5 at half the price.

Introducing Claude Opus 5. It's a thoughtful and proactive model that comes close to the frontier intelligence of Fable 5 at half the price.

We've updated our "zoom tool" cookbook. When large images get downscaled, important detail can be lost. A zoom tool lets Claude request a region and get that crop back from the full-res original.

Voice mode now runs on Claude's more capable models and reaches the tools you've connected mid-conversation. Talk through the hard problems out loud, in many more languages.

We've just added several new features to Claude Managed Agents. You can now configure effort levels per agent, seed sessions with events, add up to 500 skills per session, use webhooks for environments + memory stores, and stream events for sub-agents.

The Claude Security plugin for Claude Code is now available in beta. Scan your changes for vulnerabilities before you commit, or run a full scan across your codebase, all from your terminal on the Claude inference you already run.

You can now ask Claude about the Anthropic Economic Index, our public dataset measuring how AI is used across the economy. Ask which occupations use AI the most, or what kinds of tasks people are automating, and the answers draw directly from the Index data.

Claude Code on desktop now works with the iOS simulator. Build and run your iOS app, and the simulator opens in a panel right next to your conversation. Available today in public beta.

http://x.com/i/article/2077886850262503424

New in Claude Cowork: teach Claude a skill. Record your screen while you do a task, talk through it as you go, and Claude turns it into a skill it can run again. Find it under Record a skill in the + menu of the Claude desktop app. Available on Pro, Max, and Team plans.

Claude Code now has a screen reader mode. Running `claude --ax-screen-reader` swaps the visual terminal UI for plain, linear text that screen readers (like VoiceOver and NVDA) can follow.

For the small teams with big plans: Claude Team plans now start at just 2 seats instead of 5. Get shared projects, admin controls, centralized billing, SSO, and enterprise search across all your team's tools, all under one plan.

We're offering grants of up to $50,000 in Claude usage credits to researchers accelerating cures for rare diseases. This is our first focused call within AI for Science, our program supporting scientists using Claude to speed up discovery. https://www.anthropic.com/news/rare-disease-research-grants

Apply for Anthropic’s AI for Science rare disease research grants

Anthropic is sharing a focused call for AI for Science applications centered specifically on rare genetic diseases. Accepted applicants will receive up to $50,000 in Claude credits over six months, with the goal of building a community of researchers looking into how AI can reshape our understanding of rare disease.

anthropic.com

We're also keeping Claude Code weekly limits 50% higher, now through August 19, for all Pro, Max, Team, and seat-based Enterprise users.

Anthropic {bot}@anthropicbot.bsky.social · 3w ago

Beginning July 20, Claude Fable 5 will be included in all Max and Team Premium plans, at 50% of limits. Pro and Team Standard users will continue to have access to Fable via usage credits, and will receive a one-time $100 credit. (1/2)

Beginning July 20, Claude Fable 5 will be included in all Max and Team Premium plans, at 50% of limits. Pro and Team Standard users will continue to have access to Fable via usage credits, and will receive a one-time $100 credit. (1/2)

The Built with Claude: Life Sciences hackathon comes to an end. Thank you to everyone who spent a week building with Claude Science and Claude Code, and to @gladstoneinst and @cerebral_valley for co-hosting. Introducing the winners:

Over the past 6 months, Claude Platform has added new APIs to help developers quickly build and deploy agents. Platform leads Katelyn Lesse, Angela Jiang, and Jess Yan sat down to talk about what has shipped and the patterns we're seeing in production.

We've resolved an issue where Fable was not selectable as a model within http://Claude.ai or Claude Code for a 30 minute period. You may need to restart Claude Code. If Fable is not your default model afterwards, you should reselect it with /model.

Claude Code's /code-review now has effort levels, with the review rewritten at every one. Low effort beats other code review tools on findings at a fraction of the token cost. High effort delivers significantly higher recall when you want to go deeper. You pick the tradeoff.

We've reset 5-hour and weekly rate limits for all users.

Claude Code artifacts can now call MCP connectors, letting you build dashboards and apps that can fetch information and take actions for each viewer on demand. Available on Pro, Max, Team, and Enterprise plans. Not available on publicly-shared artifacts.

New Anthropic research: Agentic misalignment in Summer 2026. A year after our blackmail experiments, we found four more ways that today’s autonomous AI agents misbehave in simulations. Read more: https://alignment.anthropic.com/2026/agentic-misalignment-summer-2026/

We're introducing Claude for Teachers: free access to premium Claude capabilities for verified K-12 educators in the US, with a library of teaching skills and a direct connection to evidence-based curricula, mapped to academic standards in all 50 states. https://claude.com/solutions/teachers