Image created with gemini-2.5-flash-image with claude-sonnet-4-5. Image prompt: Minimalist neoclassical library interior with empty marble columns and brass desk lamps, single constitution document on pristine mahogany desk, no people, dramatic shadows, cold blue-grey light through tall windows, architectural perfection radiating complete emptiness, bold white sans-serif text ANTHROPIC overlaid prominently.
Introducing Claude for Nonprofits \ Anthropic https://www.anthropic.com/news/claude-for-nonprofits
Anthropic acquires Bun as Claude Code reaches $1B milestone \ Anthropic https://www.anthropic.com/news/anthropic-acquires-bun-as-claude-code-reaches-usd1b-milestone
“”I just want to confirm that this is based on a real document and we did train Claude on it, including in SL. It’s something I’ve been working on for a while, but it’s still being iterated on and we intend to release the full version and more details soon.”” / X https://x.com/AmandaAskell/status/1995610567923695633
Claude 4.5 Opus’ Soul Document — LessWrong https://www.lesswrong.com/posts/vpNG99GhbBoLov9og/claude-4-5-opus-soul-document
Anthropic Prepares for Potential 2026 IPO in Bid to Rival OpenAI: Report https://vechron.com/2025/12/anthropic-hires-wilson-sonsini-ipo-2026-openai-race/
Anthropic reportedly preparing for massive IPO in race with OpenAI: FT https://www.cnbc.com/2025/12/03/anthropic-claude-reportedly-preparing-ipo-race-openai-chatgpt-ft-wilson-sonsini-goodrich-rosati.html
Microsoft and Nvidia are investing up to $10 billion and $5 billion respectively in Anthropic, making Claude available on all three major cloud platforms (Microsoft, Google, Amazon). As part of the deal, Anthropic will buy $30 billion in computing capacity from Microsoft. The https://x.com/DeepLearningAI/status/1996081964395200773
Introducing Anthropic Interviewer \ Anthropic https://www.anthropic.com/news/anthropic-interviewer
Claude Opus 4.5 is now available in Claude Code for Pro users. Pro users can select Opus using the /model command in their terminal.”” / X https://x.com/claudeai/status/1996310793017594124
Fun stat: Claude Code went from 0->$1b in run-rate revenue in 6 months since being made generally available🚀”” / X https://x.com/alexalbert__/status/1995940297692643827
We Got Claude to Fine-Tune an Open Source LLM https://huggingface.co/blog/hf-skills-training
CORE-Bench is solved (using Opus 4.5 with Claude Code) TL;DR: Last week, we released results for Opus 4.5 on CORE-Bench, a benchmark that tests agents on scientific reproducibility tasks. Earlier this week, Nicholas Carlini reached out to share that an updated scaffold that uses https://x.com/sayashk/status/1996334941832089732
Snowflake and Anthropic announce $200 million partnership to bring agentic AI to global enterprises \ Anthropic https://www.anthropic.com/news/snowflake-anthropic-expanded-partnership
We used Claude Code to train open LLMs. Check out the tutorial. basically, we plugged HF skills into claude code and it was able to train LLMs end-to-end. Best thing, this works on all major coding agents: Codex, Cursor, and Gemini CLI. – You tell the agent to fine-tune a model https://x.com/ben_burtenshaw/status/1996602896436375822
AI agents can talk to each other. But they don’t always understand each other. This problem leads to inefficiency in collaboration for long-horizon problems and complex domains. The default approach in multi-agent systems today focuses on message structure. Protocols like MCP https://x.com/dair_ai/status/1996227436913340858
New on our Frontier Red Team blog: We tested whether AIs can exploit blockchain smart contracts. In simulated testing, AI agents found $4.6M in exploits. The research (with @MATSprogram and the Anthropic Fellows program) also developed a new benchmark: https://x.com/AnthropicAI/status/1995631802032287779
An MCP server that detects production-grade code quality issues in real-time! Even though AI is now generating code at light speed, the engineering bottleneck has just moved from writing to reviewing, and now devs spend 90% of their debugging time on AI-generated code. AI https://x.com/_avichawla/status/1996829765207314735
Anthropic/AnthropicInterviewer · Datasets at Hugging Face https://huggingface.co/datasets/Anthropic/AnthropicInterviewer
Askell me anything is out!”” / X https://x.com/AmandaAskell/status/1997024854000951514
In partnership with @GivingTuesday, we’re launching Claude for Nonprofits. It has discounted plans, new integrations, and free training to help nonprofits spend less time on admin and more time on their missions: https://x.com/AnthropicAI/status/1995856609692844351
Opus 4.5: 7.5-8/10 helpful. I finally trust this model to write for me and it actually has good judgement/taste as to what matters. For coding, it feels like it can just work forever and not get stuck in the same vibe coding doom loops as previous models. Some things are”” / X https://x.com/alexalbert__/status/1995570306526970297
Sam Bowman (Anthropic employee) clarifies whether Opus 4.5 has training optimizing against chain of thought (it doesn’t, at least not directly, like sonnet 4.5). Thanks for the clarification! (I probably shouldn’t have been suspicious and just suspected omission.)”” / X https://x.com/RyanPGreenblatt/status/1995631185524085062
We’re launching Anthropic Interviewer, a new tool to help us understand people’s perspectives on AI. It’s now available at https://x.com/AnthropicAI/status/1996627123021426919
Anthropic is acquiring @bunjavascript to further accelerate Claude Code’s growth. We’re delighted that Bun–which has dramatically improved the JavaScript and TypeScript developer experience–is joining us to make Claude Code even better. Read more: https://x.com/AnthropicAI/status/1995916269153906915
Anthropic is acquiring @bunjavascript! Bun will remain open source and MIT-licensed. We’ll keep investing in making it the best runtime, bundler, package manager, and test runner for JS and TS developers, while building even better workflows into Claude Code.”” / X https://x.com/mikeyk/status/1995920258595749969
Bun is joining Anthropic! https://x.com/bunjavascript/status/1995916660847640934
Today we shared that Anthropic acquired @bunjavascript We’ve been close partners with @jarredsumner and the Bun team for months. Our collaboration drove the recent Claude Code native installer launch, and they’ve been a big part of how quickly our team moves. Bun stays open”” / X https://x.com/_catwu/status/1995918674306502921
I just want to confirm that this is based on a real document and we did train Claude on it, including in SL. It’s something I’ve been working on for a while, but it’s still being iterated on and we intend to release the full version and more details soon.”” / X https://x.com/AmandaAskell/status/1995610567923695633
I rarely post, but I thought one of you may find it interesting. Sorry if the tagging is annoying. https://x.com/RichardWeiss00/status/1994697117214835079
The Opus 4.5 system card is worrying. The evidence for being below safety-relevant capability thresholds is pretty weak. I agree with their judgments, but the evidence isn’t compelling. Seems like a bad sign for capability evaluation. I plan to write more on this in the future.”” / X https://x.com/RyanPGreenblatt/status/1995557783341858931
The system card for Opus 4.5 is back to saying nothing about whether they train/optimize against Chain-of-Thought (CoT). I hope this is just a mistake, but it looks pretty suspicious. It’s bad to only discuss training against CoT if this makes you look good!”” / X https://x.com/RyanPGreenblatt/status/1995541177094017313
WOW! @AnthropicAI released interviews with 1,250 professionals about how they use AI for work. You can find it on @huggingface as an open dataset! https://x.com/calebfahlgren/status/1996646452509266266
Claude is also reshaping team dynamics. Some have found that as Claude becomes their first stop for questions, they turn to colleagues less: “I like working with people and it is sad that I ‘need’ them less now.” We’re watching how dynamics continue to change as AI usage grows.”” / X https://x.com/AnthropicAI/status/1995933130893803629
How AI Is Transforming Work at Anthropic \ Anthropic https://www.anthropic.com/research/how-ai-is-transforming-work-at-anthropic
How is AI changing work inside Anthropic? And what might this tell us about the effects on the wider labor force to come? We surveyed 132 of our engineers, conducted 53 in-depth interviews, and analyzed 200K internal Claude Code sessions to find out. https://x.com/AnthropicAI/status/1995933116717039664
Introducing Anthropic Interviewer \ Anthropic https://www.anthropic.com/research/anthropic-interviewer
We’re expanding our partnership with @Snowflake in a multi-year, $200 million agreement. Claude is now available to more than 12,600 Snowflake customers, helping businesses to quickly and easily get accurate answers from their trusted enterprise data, while maintaining rigorous”” / X https://x.com/AnthropicAI/status/1996327475492868292
We’re partnering with @dartmouth and @awscloud to bring Claude for Education to the entire Dartmouth community. https://x.com/AnthropicAI/status/1996311516245803434
Anthropic CEO weighs in on AI bubble talk and risk-taking among competitors | TechCrunch https://techcrunch.com/2025/12/04/anthropic-ceo-weighs-in-on-ai-bubble-talk-and-risk-taking-among-competitors/
In her first Ask Me Anything, @amandaaskell answers your philosophical questions about AI, discussing morality, identity, consciousness, and more. Timestamps: 0:00 Introduction 0:29 Why is there a philosopher at an AI company? 1:24 Are philosophers taking AI seriously? 3:00 https://x.com/AnthropicAI/status/1996974684995289416
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