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Record · simonwillison.net

Highlights from the Claude 4 system prompt

Simon Willison · 25 min read

A post on simonwillison.net is cited by 10 distinct blogs to date (corpus.blog, measured 11 October 2026).

A record is what was published and who pointed at it. The text of the post is not shown here: read it at the source, or at its Wayback capture.

Read at simonwillison.net (opens in a new tab) Wayback capture (opens in a new tab)

10blogs citing

Citing blogs and links by period
Period Blogs Links
All time1010
Last 90 days00
Last 30 days00
Last 7 days00
Figures for this page
First cited25 May 2025
Latest citation31 May 2026
Words blogs link it with5
External links23
Length5,603
New citing blogs a weeksince May 2025
New citing blogs a week, since May 2025: 73 weeks, peak 5 a week, latest week 0

0 this week (still settling) · peak 5

Show as table
New citing blogs a week, week by week
Week of Value
19 May 20251
26 May 20255
2 Jun 20250
9 Jun 20250
16 Jun 20251
23 Jun 20250
30 Jun 20251
7 Jul 20250
14 Jul 20250
21 Jul 20250
28 Jul 20250
4 Aug 20250
11 Aug 20250
18 Aug 20250
25 Aug 20250
1 Sept 20250
8 Sept 20250
15 Sept 20250
22 Sept 20250
29 Sept 20250
6 Oct 20250
13 Oct 20250
20 Oct 20250
27 Oct 20250
3 Nov 20250
10 Nov 20250
17 Nov 20250
24 Nov 20250
1 Dec 20250
8 Dec 20250
15 Dec 20251
22 Dec 20250
29 Dec 20250
5 Jan 20260
12 Jan 20260
19 Jan 20260
26 Jan 20260
2 Feb 20260
9 Feb 20260
16 Feb 20260
23 Feb 20260
2 Mar 20260
9 Mar 20260
16 Mar 20260
23 Mar 20260
30 Mar 20260
6 Apr 20260
13 Apr 20260
20 Apr 20260
27 Apr 20260
4 May 20260
11 May 20260
18 May 20260
25 May 20261
1 Jun 20260
8 Jun 20260
15 Jun 20260
22 Jun 20260
29 Jun 20260
6 Jul 20260
13 Jul 20260
20 Jul 20260
27 Jul 20260
3 Aug 20260
10 Aug 20260
17 Aug 20260
24 Aug 20260
31 Aug 20260
7 Sept 20260
14 Sept 20260
21 Sept 20260
28 Sept 20260 (still settling)
5 Oct 20260 (still settling)

Each blog counts once, in the week of its first citation. A blog added to the index recently can bring old first citations in at once.

Who cited it

Cited by 10 blogs across 4 subjects: technology 6, arts and culture 1, books and writing 1, business and economics 1, unclassified 1.

Words blogs link it with

The words blogs link this page with, by how many different blogs use them.

  • claude 4 system prompt1 blog
  • claude system prompt1 blog
  • claude’s system prompt1 blog
  • detailed analysis1 blog
  • dug into the claude 4 system prompts1 blog

Cited by 10 blogs in 10 posts

One row per blog, the most recently citing first. Each shows the blog's newest citing post; open a row for the others.

Blog
Newest citing post
Date
Drew Breunig1 post
What Do Humans Need From Docs?

linked as “Simon Willison made”

Read at dbreunig.com (opens in a new tab)
31 May 2026
dreamhost.com1 post
We Tested 25 Popular Claude Prompt Techniques: These 5 Actually Work

linked as “dug into the Claude 4 system prompts”

Read at dreamhost.com (opens in a new tab)
19 Dec 2025
tracebit.com1 post
Canaries in the Era of Generative AI | Tracebit

linked as “Claude’s system prompt”

Read at tracebit.com (opens in a new tab)
3 Jul 2025
arjunsriva.com1 post
LLMs for Backend Engineers: From First Principles

linked as “Claude 4 system prompt”

Read at arjunsriva.com (opens in a new tab)
17 Jun 2025
diwank.space1 post
On AGI: Economic Gravity (Pt 2/6)

linked as “Claude System Prompt”

Read at diwank.space (opens in a new tab)
1 Jun 2025
ludditus.com1 post
Claude’s dirty secrets and… Grok would kill for money!

linked as “detailed analysis”

Read at ludditus.com (opens in a new tab)
30 May 2025
eod.com1 post
Large Language Profanity

linked as “leaked LLM system prompts”

Read at eod.com (opens in a new tab)
28 May 2025
Michael Tsai1 post
Claude 4

linked as “Simon Willison”

Read at mjtsai.com (opens in a new tab)
27 May 2025
The Zvi1 post
Claude 4 You: The Quest for Mundane Utility

linked as “Simon Willison offers us an organized version of the highlights”

Read at thezvi.wordpress.com (opens in a new tab)
26 May 2025
Lorin Hochstein1 post
LLMs are weird, man

linked as “Simon Willison about Claude’s system prompt.”

Read at surfingcomplexity.blog (opens in a new tab)
25 May 2025

Links from this post

Link
Host
https://docs.anthropic.com/en/release-notes/system-prompts Who cites this page
docs.anthropic.com
https://docs.anthropic.com/en/docs/build-with-claude/prompt-engineering/overview Who cites this page
docs.anthropic.com
https://www.anthropic.com/research/claude-character Read at anthropic.com (opens in a new tab)
anthropic.com
https://docs.anthropic.com/en/docs/about-claude/models/overview Who cites this page
docs.anthropic.com
https://gist.github.com/simonw/922bd3d55175616dd721cffaea2cf666/revisions Who cites this page
gist.github.com
https://claude.ai/share/87400596-5816-403e-97be-8867d37443c2 Who cites this page
claude.ai
https://gist.github.com/simonw/2652bca69523173aa191fc19ba5f5ec8 Who cites this page
gist.github.com
https://claude.ai/share/fab365ce-077c-4d77-8f37-cf2a763239e5 Who cites this page
claude.ai
https://gist.github.com/simonw/36663cbb8e51c786791e7c451d3aba13 Who cites this page
gist.github.com
https://gist.github.com/simonw/307381aaf6a063d47a79e2bdb4801d5e Who cites this page
gist.github.com
https://twitter.com/elder_plinius Who cites this page
twitter.com
https://github.com/elder-plinius/CL4R1T4S Who cites this page
github.com
https://github.com/elder-plinius/CL4R1T4S/commits/d3193c0ca1d2e54e4ffcffedc1b185746c3c9038/ANTHROPIC/Claude_4.txt Who cites this page
github.com
https://raw.githubusercontent.com/elder-plinius/CL4R1T4S/d3193c0ca1d2e54e4ffcffedc1b185746c3c9038/ANTHROPIC/Claude_4.txt Who cites this page
raw.githubusercontent.com
https://docs.anthropic.com/en/docs/build-with-claude/extended-thinking?ref=aradhye.com Who cites this page
docs.anthropic.com
https://docs.anthropic.com/en/api/messages-count-tokens Who cites this page
docs.anthropic.com
https://tailwindcss.com/ Who cites this page
tailwindcss.com
https://pyodide.org/ Who cites this page
pyodide.org
https://claude.ai/share/7273e94f-9aa4-4e60-a493-59dbc4e3e320 Who cites this page
claude.ai
https://www.papaparse.com/ Who cites this page
papaparse.com
https://sheetjs.com/ Who cites this page
sheetjs.com
https://support.anthropic.com Who cites this page
support.anthropic.com
https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js
cdnjs.cloudflare.com
Elsewhere on simonwillison.net (11)
https://simonwillison.net/2025/May/22/code-with-claude-live-blog/
simonwillison.net
https://simonwillison.net/2025/May/22/updated-anthropic-models/
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System Card: Claude Opus 4 & Claude Sonnet 4 Read at simonwillison.net (opens in a new tab)
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https://simonwillison.net/2023/Mar/22/dont-trust-ai-to-talk-about-itself/
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https://simonwillison.net/2025/May/2/what-we-missed-with-sycophancy/ Who cites this page
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Imitation Intelligence, my keynote for PyCon US 2024 Read at simonwillison.net (opens in a new tab)
simonwillison.net
https://tools.simonwillison.net/claude-token-counter Who cites this page
tools.simonwillison.net
https://simonwillison.net/2025/Mar/21/anthropic-use-brave/ Who cites this page
simonwillison.net
Claude Code: Best practices for agentic coding Read at simonwillison.net (opens in a new tab)
simonwillison.net
https://simonwillison.net/2024/Oct/21/claude-artifacts/ Read at simonwillison.net (opens in a new tab)
simonwillison.net
https://tools.simonwillison.net/ Who cites this page
tools.simonwillison.net

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