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Simon Willison Profile picture
@simonw
Dec 26, 2018 • 51 tweets • 12 min read • Read on X
There is so much great #SpiderVerse behind the scenes content on Twitter if you start following some of the artists who created the film
And the sound artists too
And here's the screenplay in full!
I also enjoyed this piece about how @philiplord drove the decision not to include subtitles for the Spanish language dialog to better represent bilingual culture remezcla.com/features/film/…
Hidden Stan Lee cameo!
There are a LOT of Stan Lee cameos
"Practically improvised"!
Yeah they really deserved this
From this thread I learned that the screenplay says "The camera is UPSIDE DOWN. Miles isn't falling through frame. He's RISING."

Full screenplay PDF, released by Sony:

origin-flash.sonypictures.com/ist/awards_scr…
Now available to buy on iTunes, $19.99 (rental available March 19th) - and it comes with a Spider-Ham short! 🕷 🐽 itunes.apple.com/us/movie/spide…
Sony have made the first 9 minutes of the film available on YouTube
This is the best interview I've seen with the directors - really gets into the details of how they worked differently to make the movie
This reference video is solid gold
I had not realized that Miles' framerate increases to 24fps by the end of the movie
Here's a tweet from just before the movie came out with a preview of one of the early scenes - but I just noticed that the conversation attached to this tweet has a ton of extra insight from the animator on how he put the scene together
I love seeing reference shots like these
More awesome #SpiderVerse fan art
Another great reference shot - Aunt May in #SpiderVerse was my favourite version of that character anywhere
Spectacular cosplay family group
This thread has some gorgeous concept art
Concept art by Alberto Mielgo

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More from @simonw

Simon Willison Profile picture
Aug 6
Here's new term of art I like: asynchronous coding agents, to describe the category of software that includes OpenAI Codex and Gemini Jules - cloud-based tools where you submit a prompt and they check out your repo, iterate on a solution and finish by submitting a pull request
Jules used that term in the headline of their general availability announcement today: "Jules, our asynchronous coding agent, is now available for everyone." blog.google/technology/goo…
LangChain's new Open SWE tool, released this morning (and MIT licensed) calls itself an "asynchronous coding agent" too
Read 5 tweets
Simon Willison Profile picture
Jun 16
If you use "AI agents" (LLMs that call tools) you need to be aware of the Lethal Trifecta

Any time you combine access to private data with exposure to untrusted content and the ability to externally communicate an attacker can trick the system into stealing your data!The lethal trifecta (diagram with three circles): access to private data, ability to externally communicate, exposure to untrusted content
Here's my full explanation of why this combination is so dangerous - if you are using MCP you need to pay particularly close attention because it's very easy to combine different MCP tools in a way that exposes yourself to this risk simonwillison.net/2025/Jun/16/th…
And yes, this is effectively me trying to get the world to care about prompt injection by trying out a new term for a subset of the problem!

I hope this captures the risk to end users in a more visceral way - particularly important now that people are mixing and matching MCP
Read 4 tweets
Simon Willison Profile picture
Jun 13
"Design Patterns for Securing LLM Agents against Prompt Injections" is an excellent new paper that provides six design patterns to help protect LLM tool-using systems (call them "agents" if you like) against prompt injection attacks Luca Beurer-Kellner, Beat Buesser, Ana-Maria Creţu, Edoardo Debenedetti, Daniel Dobos, Daniel Fabian, Marc Fischer, David Froelicher, Kathrin Grosse, Daniel Naeff, Ezinwanne Ozoani, Andrew Paverd, Florian Tramèr, and Václav Volhejn Invariant Labs, IBM, Google & more As AI agents powered by Large Language Models (LLMs) become increasingly versatile and capable of addressing a broad spectrum of tasks, ensuring their security has become a critical challenge. Among the most pressing threats are prompt injection attacks, which exploit the agent's resilience on natural language inputs — an espe...
Here are my extensive notes on the paper simonwillison.net/2025/Jun/13/pr…
It's on arXiv here: arxiv.org/abs/2506.08837
Read 5 tweets
Simon Willison Profile picture
May 25
I put together an annotated version of the new Claude 4 system prompt, covering both the prompt Anthropic published and the missing, leaked sections (thanks, @elder_plinius) that describe its various tools

It's basically the secret missing manual for Claude 4, it's fascinating! Introducing Claude Establishing the model’s personality Model safety More points on style Be cognizant of red flags Is the knowledge cutoff date January or March? election_info Don’t be a sycophant! Differences between Opus 4 and Sonnet 4 The missing prompts for tools Thinking blocks Search instructions Seriously, don’t regurgitate copyrighted content More on search, and research queries Artifacts: the missing manual Styles This is all really great documentation
simonwillison.net/2025/May/25/cl…
Don't use lists in chit chat, and don't be preachy and annoying! For more casual, emotional, empathetic, or advice-driven conversations, Claude keeps its tone natural, warm, and empathetic. Claude responds in sentences or paragraphs and should not use lists in chit chat, in casual conversations, or in empathetic or advice-driven conversations. In casual conversation, it’s fine for Claude’s responses to be short, e.g. just a few sentences long. That “should not use lists in chit chat” note hints at the fact that LLMs love to answer with lists of things! If Claude cannot or will not help the human with something, it does not say why or what it could lead...
Read 9 tweets
Simon Willison Profile picture
May 22
Started a live blog for today's Claude 4 release at Code with Claude simonwillison.net/2025/May/22/co…
I just released llm-anthropic 0.16 (and a tool-enabled 0.16a1 alpha) with support for the two new Claude models, Claude Opus 4 and Claude Sonnet 4: simonwillison.net/2025/May/22/ll…
I picked up some more details on Claude 4 from a dive through the Anthropic documentation

The training cut-off date is March 2025! Input limits are still stuck at 200,000 tokens. Unlike 3.7 Sonnet the thinking trace is now summarized by a separate model.

simonwillison.net/2025/May/22/up…
Read 4 tweets
Simon Willison Profile picture
Apr 28
Don't suppose anyone grabbed a ChatGPT system prompt leak before and after this change?

Would be interesting to see what instruction caused the sycophancy
Courtesy of @elder_plinius who unsurprisingly caught the before and after Here are just the specific changes in the diff: **Removed text:** - "Over the course of the conversation, you adapt to the user's tone and preference. Try to match the user's vibe, tone, and generally how they are speaking. You want the conversation to feel natural. You engage in authentic conversation by responding to the information provided and showing genuine curiosity." **Added text:** + "Engage warmly yet honestly with the user. Be direct; avoid ungrounded or sycophantic flattery. Maintain professionalism and grounded honesty that best represents OpenAI and its values...
@elder_plinius Here's that diff in a Gist gist.github.com/simonw/51c4f98…
Read 4 tweets

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