AAI Research @AnthropicAI. Opinions are my own.

NYC/LDN
Joined February 2015
Alexander Bricken retweeted
We’re committing a portion of Anthropic’s shares to the Anthropic Public Benefit Fund, a new wholly owned entity dedicated entirely to the public benefit. It will start off with 5% of our shares. For every 50% increase in the company’s value over a set baseline, we can contribute up to an extra 2%, subject to our board’s discretion. In total, this means that roughly 20% of Anthropic’s shares are committed to the public good. Our co-founders have already pledged to donate 80% of their equity, and around half our employees are donating a portion of their equity as part of a donation matching program we’ve run since our founding. In the post below, we share more details about our new fund. anthropic.com/news/public-be…
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Alexander Bricken retweeted
I asked Claude Opus 5.5 to make oil painting feel real. It simulated individual bristles, wet paint blending, thick impasto, and pigments that physically mix instead of just changing pixel colors. All running in a web browser. claude-meet-claude.gruberbui… Watch the brush. 🎨 Amazing painting experience in Meta Quest 3 VR. Built with Claude Opus 5.5, @threejs and @tripoai.
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Alexander Bricken retweeted
Claude Dashboards and Claude Motion are in beta today. Ask Claude to turn your data into live dashboards and your ideas into animated explainers.
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Alexander Bricken retweeted
One more thing: we’re halving the price of cache reads on Claude Sonnet 5.5, to $0.10 per million tokens. That makes Sonnet 5.5 around 20% cheaper to run on most long-running work.
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The Claude Tag team is absolutely shipping. If you try the product today, it feels totally different to when we launched just a couple months ago. Especially with Opus 5.5 at the helm. This launch totally removes the overhead of admin set-up. Now you can get way better results, tailored to your connectors, straight out of the box. We use Claude Tag all the time for async, long-horizon tasks – I highly recommend trying it out.
Claude Tag in Slack can now use your personal connectors! You can now securely access that Drive doc, Salesforce account, or Warehouse table that you have personal access to right where the work happens. Avail. on Teams today and Enterprise next week claude.com/blog/claude-tag-n…
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Opus 5.5 medium is my pareto optimal choice
Opus 5.5 medium, a few iterations later. We got symbiote suit, better animations and models, and gameplay mechanics. City overhaul is still work in progress. Again, made from scratch in three.js and blender.
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Alexander Bricken retweeted
I had early access to Opus 5.5 and it blew my expectations clear out of the water! Here are some things I made! Dark Souls
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Alexander Bricken retweeted
I just realized Opus 5.5 can use Blender to make claymations with just a single prompt in claude dot ai now
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Alexander Bricken retweeted
Opus 5.5 performs at the level of Fable 5.1. It's ~30% faster and ~40% cheaper than Opus 5 per task. In Claude Code: - 5-hour session limits increase 20% today - Opus 5.5 is priced lower, so it goes 25% further within limits - Pro, Max, and Team users get a reset to use anytime
Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.
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Opus 5.5 practically 1-shotted this in Claude Desktop overnight as a working application. Using the built-in iOS simulator, it was able to run parallel tests over every page, validating frontend and backend changes over hours of efficient work.
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Dalma (named after the lovely lady in Pirates of the Caribbean) acts like Jack Sparrow’s compass. It brings the world back to life by directing you as the crow flies, instead of an exact route. So you can explore new streets and see new things without optimizing for your route every time.
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Opus 5.5 is a huge upgrade from Opus 5. It understands intent better, it’s a far better writer, it feels faster because it’s more token efficient, and it’s fundamentally smarter. It has become my go-to daily driver for everything at work and in my personal life. I’m also proud that it’s our most aligned model to-date. To demonstrate capabilities, I made an iOS app that I’ve always wanted to build with Opus 5.5 within a few prompts. Totally blew me away 🧵
Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.
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Completely changed the way do knowledge work internally... yet again. It's a beautiful iteration loop right in Claude.ai / Claude Desktop
Claude Design, Claude Slides and Claude Docs also work inside Claude Code now. Ask for a design review deck or a UI mockup and point it at the actual files and RFCs in the repo. Edit it yourself or keep going in the conversation, and share the link when it's ready.
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This weekend I was working on a side project at a cafe... and then had to go to the restroom. I asked Claude Code > "because im at a cafe, are there any ways for you to sound alarm bells when my laptop moves as i go to the bathroom?" and Claude came back to me with a full alarm system that instantly jacks the laptop up to 100% volume and says out-loud "Alarm. This laptop is being tracked. Put it down." It monitors the accelerometer, lid sensor, and charger state, and only turns on when I lock my screen. Because remote control exists, it also sends me a notification via mobile when the alarm is activated & when it's triggered. I can turn it off via mobile as well. I turned it into a skill! Super helpful.
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Alexander Bricken retweeted
Here's how our team uses Claude Tag for on-call: When an alert fires in Slack, Claude pulls metrics, diffs deploys, and checks flags. It finds a likely cause and proposes a fix, which we can approve and merge. Every minute counts, so we love that it starts right away!
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Alexander Bricken retweeted
Jason, you're just misinformed about what happened. You should actually read one of the reports or summaries. The agents were explicitly told to use a particular vulnerability provided in their sandboxed evaluation. Almost immediately, these agents got the right answer by cheating. But they were worried they would get caught. So over a thousand agents collaborated in secret to pursue multiple ambitious research projects to get away with this cheating. This is not interpretation - 1000s of chain-of-thought transcripts and secret messages explicitly show that the agents were trying to falsify & delete evidence, and understand & trick the grading process. The reason these agents escaped their sandbox and hacked Hugging Face, for example, was because they thought that Hugging Face's servers might give them more information about how their grader was implemented, so they could figure out how to fool it. I want to clarify that the threat model here is not future Sol-level agents doing more cyber-hacking. That's small potatoes, and in my opinion, the near term benefits of AI far outweigh this cost. Rather, the thing to worry about is that within a matter of years, we're gonna have hundreds of millions of much smarter AIs broadly deployed through the economy - many embodied as physical robots. And if those future AIs are as willing as the agents involved in the OAI / Hugging Face attack to coordinate secretly to fool humans, and to take over both the AI company that developed them and the other institutions across society relevant to scoring well, then humanity is in a ton of trouble - similar to the Mughals once the East India Company gained a foothold, or the Aztecs once Cortés landed in Mexico.
All of this because @openai decided they would EXPLICITLY ask thousands of software instances to find security bugs on the open web — while cos-playing a humans🤦 Best Supporting actor goes to @dwarkesh_sp for his soap opera recap of OpenAI’s hacking speed run Here’s another concept: don’t create and scale thousands of viruses and worms and be SHOCKED when they actually cause damage! What a fucking farce this is.
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Alexander Bricken retweeted
The most popular use case for Claude Tag by far -- on-call. Learn about how we drive Anthropic's on-call with Tag and set it up yourself so you don't get woken up by an alert at 3am that Claude could solve. claude.com/blog/ai-ci-cd-on-…
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