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Highlights from the Claude 4 system prompt

https://simonwillison.net/2025/May/25/claude-4-system-prompt/
4•dcre•3h ago

Comments

mike_hearn•2h ago
What I'd like to know is why they write it all in the third person. One might expect a system prompt to use the word "you" a lot, but Anthropic don't do that and there must be a reason.
simonw•7m ago
My best guess is that this is a reflection of how these things actually work.

When you "chat" with an LLM you are actually still participating in a "next token" prediction sequence.

The trick to get it to behave like it is a chat is to arrange that sequence as a screenplay:

  User: five facts about squirrels

  Assistant: (provide five facts)

  User: two more

  Assistant:
When you think about the problem like that, it makes sense that the LLM is instructed in terms of how that assistant should behave, kind of like screen directions.

Are the Colors in Astronomical Images 'Real'?

https://www.scientificamerican.com/article/are-the-colors-in-space-real/
1•bryanrasmussen•1m ago•0 comments

Tim Cook's Bad Year Keeps Getting Worse

https://www.wsj.com/tech/ai/apple-ceo-tim-cook-tariffs-ai-48049d0c
4•retskrad•3m ago•1 comments

TES Renewal Skywind – Progress update and gameplay demo [video]

https://www.youtube.com/watch?v=8wWpMR5mo-w
1•AntiqueFig•4m ago•0 comments

ARM PAN

https://blog.siguza.net/PAN/
1•luu•7m ago•0 comments

Gamers Are Making EA, Take-Two and CDPR Scared to Use AI

https://www.forbes.com/sites/paultassi/2025/05/24/gamers-are-making-ea-take-two-and-cdpr-scared-to-use-ai/
1•healsdata•13m ago•0 comments

College Board keeps apologizing for screwing up digital SAT and AP tests

https://arstechnica.com/culture/2025/05/college-board-keeps-apologizing-for-screwing-up-digital-sat-and-ap-tests/
2•arittr•14m ago•0 comments

Does employee happiness create value for firm performance?

https://www.nature.com/articles/s41599-025-05024-2
2•thisislife2•14m ago•0 comments

The 3.5 percent remittance tax

https://marginalrevolution.com/marginalrevolution/2025/05/the-3-5-percent-remittance-tax.html
1•paulpauper•16m ago•0 comments

You Can See the End of the Great Stagnation, but Productivity Statistics

https://marginalrevolution.com/marginalrevolution/2025/05/you-can-see-the-end-of-the-great-stagnation-everywhere-but-in-the-productivity-statistics.html
1•paulpauper•17m ago•0 comments

Crypto Is a Threat to the U.S. Financial System

https://www.nytimes.com/2025/05/23/opinion/trump-crypto-stablecoin.html
2•paulpauper•17m ago•0 comments

Maybe: The personal finance app for everyone

https://github.com/maybe-finance/maybe
1•saikatsg•21m ago•0 comments

News: the US Credit Downgrade

https://www.nominalnews.com/p/moody-us-credit-downgrade
1•MPLan•22m ago•1 comments

Chomsky on What ChatGPT Is Good For

https://chomsky.info/20230503-2/
22•mef•22m ago•5 comments

The Art of Independent Learning

https://afterhoursresearch.substack.com/p/the-art-of-independent-learning
1•snekcaseenjoyer•23m ago•0 comments

Path to a free self-taught education in Computer Science

https://github.com/ossu/computer-science
4•saikatsg•23m ago•0 comments

Amazon has built a robot that can kill the coronavirus in warehouses and stores

https://www.businessinsider.com/amazon-builds-uv-light-robot-to-kill-coronavirus-on-surfaces-2020-5
3•01-_-•24m ago•1 comments

The Newark airport crisis is about to become everyone's problem

https://www.theverge.com/planes/673462/newark-airport-delay-air-traffic-control-tracon-radar
2•01-_-•25m ago•0 comments

Rive – a new way to design, build, and ship user interfaces

https://rive.app/
1•personality1•25m ago•0 comments

Windows was the problem all along [video]

https://www.youtube.com/watch?v=CJXp3UYj50Q
1•Analemma_•28m ago•0 comments

Traditional Funnels Fail and How AI Is Changing That

https://getdecipher.com/blog/why-traditional-funnels-fail-and-how-ai-is-revolutionizing-user-behavior-analysis
1•mrosenfield•29m ago•0 comments

U.S. reports cases of new Covid variant NB.1.8.1 behind surge in China

https://www.cbsnews.com/news/us-reports-cases-new-covid-variant-nb-1-8-1-behind-surge-china/
1•bookofjoe•29m ago•0 comments

Writing a Self-Mutating x86_64 C Program (2013)

https://ephemeral.cx/2013/12/writing-a-self-mutating-x86_64-c-program/
4•kepler471•30m ago•0 comments

I Write

https://neoconomist.com/why-i-write
2•neoconomist•32m ago•0 comments

Whey Isolate vs. Concentrate: Which Is Better for You?

https://www.wheyindex.com/blog/whey-isolate-vs-concentrate-which-is-better-for-you
1•thewheyguy•33m ago•0 comments

Terence Tao on the importance of funding basic mathematical research

https://mathstodon.xyz/@tao/114568996952809637
2•bertman•34m ago•0 comments

Show HN: Zli – A Batteries-Included CLI Framework for Zig

https://github.com/xcaeser/zli
3•caeser•38m ago•0 comments

Direct Preference Optimization vs. RLHF

https://www.together.ai/blog/direct-preference-optimization
2•summarity•40m ago•0 comments

Show HN: Structured JSON Prompts for AI Image Generation

https://github.com/xcaeser/image-json-gen
1•caeser•41m ago•0 comments

Ordinary life improvements 2018-2025

https://smagin.fyi/posts/ordinary-life-improvements/
1•smagin•42m ago•1 comments

How Do You Explain Low Code

https://www.teamrappid.com/blog/how-do-you-explain-low-code
1•mooreds•46m ago•0 comments