Angela Jiang

interdisciplinarian. leading claude platform @anthropicai

[Angela Jiang @angjiang]

If you're perfectly qualified to do something, you've already outgrown it

[Sean Strong @sean_t_strong]

You can now embed your website in Claude and have it be interactable. You can do this via MCP apps, where we've enabled frame_domains support for verified plugins.

It was a blast to build this out with the team & our partners, let us know what you think!

[Milli @justtmilli]

one thing i learned from video games is that when you come across enemies, you're going the right direction.

[Angela Jiang @angjiang]

Hard problems only. Good company. Excited to have you with us @threepointone!

[sunil pai @threepointone]

week 1 as mots @AnthropicAI, very fkin excited to work with @katelyn_lesse @angjiang et al

[Angela Jiang @angjiang]

@ViktorMiykov yeah works for any claude model! you just need to call it via the messages api.

[Angela Jiang @angjiang]

make your long context sessions 35% faster

[ClaudeDevs @ClaudeDevs]

Message threads are now in public beta on the Messages API.

The API caches your conversation on the server between turns, so instead of resending the full conversation, you send only new messages and the previous message ID, and Claude starts responding sooner.

[Angela Jiang @angjiang]

@xGoatJames if you use the api, you can implement this directly for your own agentic harness (very easy!)

on subs, we implemented this on claude code too so you should see 35% faster time to first token at longer contexts (500k-1M tokens)

[Rod Howarth @rodhowarth]

AI is rough if you're a software engineer who loves the engineering more than the software. It’s incredible for those that care more about the end result than how it was built. Make the shift.

[Angela Jiang @angjiang]

@jon_vs_moloch Haha

[Angela Jiang @angjiang]

there are cathedrals everywhere for those with the eyes to see

ps. we are hiring and are actively trying to solve these problems

[Katelyn Lesse @katelyn_lesse]

software engineers are going to have to tackle a new set of problems to unlock powerful multiagent systems to solve the world's hardest problems - right now is one of the most interesting moments in history to be an engineer. https://t.co/YsQ0xta4KR

[Anthropic @AnthropicAI]

Anthropic has filed an S-1 registration statement with the SEC related to its proposed IPO.

Read more: https://t.co/ofhv0DK3Zp

Legal disclaimer: A registration statement relating to these securities has been filed with the SEC but has not yet become effective. These securities may not be sold, nor may offers to buy be accepted, prior to the time the registration statement becomes effective. This post does not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

[Angela Jiang @angjiang]

A very clear eyed picture of what’s coming. You will need a software factory for defense, not just internal productivity.

[Alan Wells @alanwells]

Just spent the last 7 days on the front lines of the vulnpocalypse fending off an active cyber attack on one of our products.

Some thoughts:

- Software factories are going to be required equipment for everyone. There’s just no way to keep up with the pace of highly automated adversaries without one.

- We were lucky because we had spent the last few months getting our software factory running well. It is nice to have for product development but proved to be absolutely essential this week.

- At the minimum you need to have a coding server in the cloud pre-provisioned with read only access to all your logs and all the services you depend on for observability. With that in place you are a prompt away from reasonably good situational awareness, ongoing monitoring with loops, and ability for coding agents to validate fixes against your actual, observed attack patterns.

- Shared coding server also unlocks multiplayer incident response where everyone can see every session and jump in as needed. Sharing session links that can be forked is much higher bandwidth than re-explaining things.

- You don’t need to be Ramp/Stripe/Uber scale to have a working software factory in the cloud. We are a team of 3. Ours is built with an @opencode server (thanks @thdxr!), a forked version of compound engineering optimized for automated workflows (thanks @kieranklaassen!) and a multiplayer agent in slack that handles crons (we have our own harness but pick your favorite here).

- To get our software factory up and running well, we had to stop all new product development for ~6 weeks and just focus on getting the validation systems working that enabled us to reliably shipping PR without human code review. This felt very painful in the moment but was totally worth the eventual speedup in velocity.

- KYC for @AnthropicAI & @OpenAI cyber programs is now easy and quick (at least for defensive access), but a day felt like a lifetime this week. Submit your app now before you really need it.

- Getting Mythos access unlocked a deeper level of analysis that helped us shift from reactive mitigation to proactive patching. Wish we had done this a few weeks earlier. Get started now!

[Angela Jiang @angjiang]

@staysaasy this is hard lesson for many new managers to learn

[Angela Jiang @angjiang]

@rodkendrick It may even make sense for background jobs to be slower (for cheaper!)

[Angela Jiang @angjiang]

We GA’d opus 5.5 fast mode yesterday where you can run opus at 2.5x speeds at 2x the cost

And now we’re making Claude product surfaces faster across the board. Baseline speeds are up 3x-1.5x.

[ClaudeDevs @ClaudeDevs]

We keep improving performance across Claude, and you may have noticed it starts responding sooner!

Claude Code now gzips the conversation it sends on every turn, so it reaches the model faster. Cloud sessions also start up as soon as you start typing.

[Angela Jiang @angjiang]

@SuzanMaseki If you ever get impatient with your experiments…

Let me know how they go

[Angela Jiang @angjiang]

Opus 5.5 FAST

[ClaudeDevs @ClaudeDevs]

Opus 5.5 fast mode in the Claude Platform is no longer in research preview, and we’ve removed the waitlist!

It’s the same Opus 5.5 but up to 2.5x faster, at $8 / $40 per million tokens.

It's also available in Microsoft Foundry (Hosted on Azure), with Google Cloud coming soon.

Fast mode in Claude Code remains unchanged, and uses extra usage credits.

See our docs here:
https://t.co/RikPqqIY0W

https://t.co/oB0fhEgC88

[Angela Jiang @angjiang]

@CodeAkram Yes

[Angela Jiang @angjiang]

@SuzanMaseki yeah you're fine. https://t.co/ldAwMh9pRd has details on what we do/don't allow. your use case falls under acceptable use

[Angela Jiang @angjiang]

Distilling claude to produce models without safeguards opens up new attack vectors. We’re making it harder to do so to improve safety.

[Anthropic @AnthropicAI]

Over the last few months, we’ve made significant progress in reducing the effectiveness of distillation attacks against Claude.

In this post, we explain how: https://t.co/uWiRSLBuOS

[Angela Jiang @angjiang]

@hrkrshnn Hey - running evals should be a legitimate use case. Feel free to DM me your details as I’d like to find a way to make that something we support better