Christopher Nulty

Head of External Comms, @AnthropicAI | @Airbnb, @Yahoo, @SEIU & @ColgateUniv alum. Opinions are my own, etc.

[Christopher Nulty @cnulty]

@itsclivetime Welcome to the team!

[Claude @claudeai]

Introducing Claude Opus 4.8: it builds on Opus 4.7 with sharper judgment, more honesty about its own progress, and the ability to work independently for longer than its predecessors.

Available today at the same price.

[Christopher Nulty @cnulty]

@chrisrohlf @AnthropicAI Welcome aboard!

[Andrej Karpathy @karpathy]

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.

[Christopher Nulty @cnulty]

@cameron_parker @barakgila No love for the Finger Lakes!

[Sholto Douglas @_sholtodouglas]

When do you reach for other models instead of Claude? What can we do better? Hit me with all of your frustrations. dms open.

If you can give me detail (e.g. specifics/transcipts) - it'll help a lot in finding out exactly what we need to do to improve the next model

[Logan Graham @logangraham]

A lot of people have been wondering about Mythos, Glasswing, and the vulns we / our partners are fixing. Today, I’m excited for us to start sharing more. (For context, I lead Glasswing @AnthropicAI.)

Two independent evaluations this week—from XBOW and the UK AISI—confirm what we've been seeing internally: Claude Mythos Preview is a step change in autonomous cybersecurity capabilities. We need to start preparing fast for a world of models with this level of capabilities.

The UK AI Security Institute tested the model we shipped at the launch of Project Glasswing and found Mythos Preview is the first model to solve both of their end-to-end cyber ranges, including one (Cooling Tower) which no model had ever cleared. But attackers (and defenders) have sophistication & cost constraints – Mythos is also the only model that clears every one of their tasks estimated over 8 hours under their deliberately low 2.5M-token cap.

XBOW tested it on their offensive security benchmarks, finding "token-for-token, unprecedented precision." It's the only model to succeed at subtle V8 sandbox work.

Other Glasswing partners shared similar stories. In a few weeks of testing, Mythos Preview has helped them find many thousands of (estimated) high + critical severity vulnerabilities, sometimes double what they'd normally find in a year.

I don't share this to boost Mythos. In fact, this is not about Mythos. It’s about preparing for the coming world of models being better, faster, cheaper, and more creative than some of the best human experts at dual use capabilities. Clearly, we need them supporting defenders as widely as can be done safely – and especially the least resourced ones.

Within a year, Mythos will probably look quite dumb (relative to other new models). And others may release openly available or unguardrailed models of Mythos-level capabilities.

We started Project Glasswing because capabilities like Mythos Preview's won't stay rare, or stay in careful hands. We are bringing it to defenders as fast as we responsibly can, while working to figure out, for example, the right safeguards and patching & disclosure processes.

Also, to be clear, compute has never been a limiter in our rollout.

Expect a fuller update on our Glasswing work in the coming days.

XBOW report: https://t.co/Mumtbf3kE3

UK AISI report: https://t.co/vBgqz0AeKJ

[Christopher Nulty @cnulty]

It's interesting to see how much this trend has shifted in the last 6 months.

[Similarweb @Similarweb]

Gen AI traffic share update

Main takeaways:
→ Claude and Gemini continue to grow.
→ ChatGPT moves closer to the 50% mark.

🗓️ 12 months ago:
ChatGPT: 77.6%
Gemini: 7.27%
DeepSeek: 6.01%
Grok: 3.17%
Perplexity: 1.75%
Copilot: 1.56%
Claude: 1.37%

🗓️ 6 months ago:
ChatGPT: 69.5%
Gemini: 15.9%
DeepSeek: 4.06%
Grok: 3.31%
Perplexity: 2.22%
Claude: 2.12%
Copilot: 1.97%

🗓️ 3 months ago:
ChatGPT: 61.2%
Gemini: 23.9%
Grok: 3.94%
DeepSeek: 3.09%
Claude: 3.29%
Copilot: 1.87%
Perplexity: 1.74%

🗓️ 1 month ago:
ChatGPT: 53.7%
Gemini: 26.7%
Claude: 7.95%
DeepSeek: 3.97%
Grok: 3.20%
Copilot: 1.98%
Perplexity: 1.50%

[sam mcallister @sammcallister]

Claude Mythos Preview becomes the first model to solve both of the AISI cyber ranges.

[Christopher Nulty @cnulty]

Some interesting new data from Ramp on the progress we’ve made in enterprise. AI is not a winner-take-all game, but the biggest perception shift over the last year may be this: winning consumer (i.e., unpaid users) is not the same as ‘winning AI’

[Ara Kharazian @arakharazian]

ANTHROPIC beats OpenAI in business adoption for the first time. per @tryramp data

Today's update of Ramp AI Index shows 34.4% of businesses using Anthropic versus 32.3% using OpenAI.

Adoption of Anthropic quadrupled over the last year, while OpenAI rose only 0.3%.

[Christopher Nulty @cnulty]

@bcherny Fly like Boris!

[Christopher Nulty @cnulty]

@kimmonismus Yeah, we agree… https://t.co/IsyRBzzrVS

[Helen Toner @hlntnr]

One of the things that made the Mythos release hard to interpret is that Anthropic held back details on most vulns they found, to give defenders time to patch.

1 month later, info from orgs with access to Mythos is starting to trickle out, e.g. this post from Mozilla today:

[Christopher Nulty @cnulty]

@LaurenGoode I think you meant ‘hold light and shade’. As a company, we think it’s really important to talk about both the benefits and risks of AI.

[Christopher Nulty @cnulty]

@rpoo Welcome!!

[Thariq @trq212]

"everyday we're trying to obtain more compute to pass on to you, we're sorry if it takes sometime but we're going to acquire as much as we can"

you heard the man

[Christopher Nulty @cnulty]

@GerritD Great to see you!

[marisa @meshtimes_]

30 mins into the claude code keynote and every speaker so far has been a woman. just saying 🫶🏻

@asvora @angjiang @katelyn_lesse @_catwu Dianne Penn @claudeai

[Thariq @trq212]

Claude in Space 🤞

[Christopher Nulty @cnulty]

Good morning from Code with Claude!