Ryan Whitehead (@ryan_whitehead) header
Ryan Whitehead (@ryan_whitehead) profile picture

Techno optimist. Product marketing at Anthropic. Ex Coinbase, Facebook, MSFT. Obsessive reader, cyclist, eater.

Oakland, CA
Joined September 2007
Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)Photo by Ryan Whitehead (@ryan_whitehead)
Getting to jam with our research team was already peak benefit at Anthropic.
Personal update: I've joined Anthropic. I think the next few years at the frontier of LLMs will be especially formative. I am very excited to join the team here and get back to R&D. I remain deeply passionate about education and plan to resume my work on it in time.
2
1
2
102
May you live in interesting times
With the help of Claude Mythos Preview, the Firefox team fixed more security bugs in April than in the past 15 months combined.
98
Ryan Whitehead retweeted
With the help of Claude Mythos Preview, the Firefox team fixed more security bugs in April than in the past 15 months combined.
334
1,223
314
15,220
1,501,319
Context engineering is the biggest lever on model performance (arguably alongside AI dark arts like prompting & harness design). Was happy to work with Hugging Face on their context course. huggingface.co/learn/context…
1
1
104
Models can be quirky + jagged; these techniques help you extract the most juice.
1
36
For any fans of skills aka Agent Skills, we recently launched a community Discord ... come join the fun: discord.com/channels/1481096…
1
71
Really great practical guidance on skill building. The mental model for skill categories is particularly useful for people thinking through what type of skills to build!
1
3
172
Ryan Whitehead retweeted
🎁 Happy Friday - Opus 4.6 1M is now the default Opus model for Claude Code users on Max, Team, and Enterprise plans. Pro and Sonnet users can opt in with /extra-usage.
1 million context window: Now generally available for Claude Opus 4.6 and Claude Sonnet 4.6.
283
242
95
4,488
373,521
Long context generally available, no multiplier, expanded media limits - add 600 pdfs / images. If you think context rot is an inevitability, it's not. It's a problem we are working to solve with training and engineering.
1 million context window: Now generally available for Claude Opus 4.6 and Claude Sonnet 4.6.
2
85
Everyone should be creating a skill for navigating their API - with AI as the dominant mode for software development, it's such a powerful way to network best practices.
a project i've been excited about: make Claude Code better at using the Claude API. just ask Claude Code about Claude API features (e.g., prompt caching, adaptive thinking + effort, tools, etc).
1
55
Enjoyed this discussion of the political / societal implications of the Anthropic / DoW situation. Useful observation that the real tension is between those that see AI as continuous w/history of technological advancement vs a unique discontinuity. nytimes.com/2026/03/06/opini…
1
1
117
Only real miss here was "why Anthropic rushed into the space as early as they did." Of course, not a company position, but if you A) believe the scaling laws and B) are compelled to lead on safety, engaging early is the obvious path.
47
Was fun working on this, looking inside the mind of Claude. Too clever at times! One thing I love about Anthropic is that no matter your role, you get deep exposure to research and product. Feeling the grain of the product helps with mission alignment.
New on the Anthropic Engineering Blog: In evaluating Claude Opus 4.6 on BrowseComp, we found cases where the model recognized the test, then found and decrypted answers to it—raising questions about eval integrity in web-enabled environments. Read more: anthropic.com/engineering/ev…
4
187
Keep moving forward. Remain ready for service. Do it with equanimity. These are not normal times but they're probably the most normal it will be for a while.
1
85
Give Clawd his magic wand!
check out the updated skill-creator. i esp like built-in support for test generation (e.g., to measure + optimize tricky things like skill trigger rate). available in Claude Code as plugin, Claude.ai, + Cowork.
1
81
We shipped evals and benchmarking in a skill-creator update today. Write tests, A/B compare skill versions, track regressions. No code required. Whether you're a dev or an SME, you now have real tools to validate that your skills work. claude.com/blog/improving-sk…
2
1
85
Clarity of principle and vision. Few things more American than limited government, robust civil society, and economic freedom. The beauty here is we all have a voice. Everyone should be able to use theirs without fear of retribution. 🧡
Dario Amodei just gave his first interview since the Pentagon blacklisted his company. The toll is visible on his face. He was asked one question. What would you say to the President right now? He didn’t hesitate. Amodei: “We are patriotic Americans. Everything we have done has been for the sake of this country.” Anthropic built their models to defend America. They were the first AI lab cleared for classified military systems. They wanted to help the warfighter. But the Pentagon demanded unrestricted access to fully autonomous weapons and mass surveillance of American citizens. Amodei drew the line. The government responded with emergency Cold War powers. A supply chain designation normally reserved for foreign adversaries. A six-month federal phaseout ordered from Truth Social. Amodei: “When we were threatened with supply chain designation and Defense Production Act, which are unprecedented intrusions into the private economy, we exercised our classic First Amendment rights to speak up and disagree with the government.” The administration framed Anthropic’s refusal as anti-American. Amodei’s response dismantled that framing in one sentence. Amodei: “Disagreeing with the government is the most American thing in the world.” Here is the deeper paradox nobody in Washington wants to say out loud. We are in a geopolitical race against autocratic adversaries who use AI for mass surveillance of their own citizens and autonomous weapons with no human oversight. The Pentagon demanded that Anthropic build those exact capabilities for America. Amodei: “The red lines we have drawn, we drew because we believe that crossing those red lines is contrary to American values.” You cannot defeat authoritarianism by adopting its methods. You cannot defend the open society by forcing private companies to build its antithesis under threat of wartime emergency powers. Anthropic held the line. Got blacklisted for it. And came out the other side saying the same thing they said going in. That is what it actually looks like to mean it.
1
93
If it's this important, you cannot blink. Proud to continue building safe and beneficial powerful AI with this team and this leadership.
3
69
Who needs a bicycle for the mind when you can have skis for a thoroughbred
how it feels to use claude code
73
I knew I found my people and my place at anthropic! Proud of our willingness to work with the DoW to try and find a solution; proud of our willingness to stick to our principles
1
4
206