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site iconSimon WillisonModify

Creator of Datasette and Lanyrd, co-creator of the Django Web Framework.
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Made some notes on how Cursor works under the hood based on their security documentation - it turns out an organization's list of subprocessors offers...

2025-05-12 03:17:08

Made some notes on how Cursor works under the hood based on their security documentation - it turns out an organization's list of subprocessors offers a loose form of "view source" for their infrastructure!
https://simonwillison.net/2025/May/11/cursor-security/

Gemini 2.5 now applies the 75% cached token discount automatically - previously you had to manually configure it Potentially big cost savings here for...

2025-05-09 23:34:42

Gemini 2.5 now applies the 75% cached token discount automatically - previously you had to manually configure it

Potentially big cost savings here for applications that run prompts against the same long context, or continue existing conversations https://simonwillison.net/2025/May/9/gemini-implicit-caching/

The lack of love for magic links is interesting (I'm not a fan personally, especially since I'm never confident if they'll work on my laptop if I clic...

2025-05-08 23:23:31

The lack of love for magic links is interesting

(I'm not a fan personally, especially since I'm never confident if they'll work on my laptop if I click the link on my mobile phone)



Jeremy Howard: What auth ui do you prefer as a user?

i.e would you rather login to a service you use regularly by having it send you an email with a link ("magic link"), by clicking a button for a provider you've previously logged in to eg google/github/etc (oauth), or classic user/password?

This bug was affecting my llm-gemini plugin too: I just shipped a release fixing that https://simonwillison.net/2025/May/8/llm-gemini-0191/ If you're ...

2025-05-08 13:50:43

This bug was affecting my llm-gemini plugin too: I just shipped a release fixing that https://simonwillison.net/2025/May/8/llm-gemini-0191/

If you're calculating costs against Gemini you should know that you need to add candidatesTokenCount and thoughtsTokenCount together for the total billed amount



Paul Gauthier: The $6.32 benchmark cost for Gemini 2.5 Pro Preview 03-25 was incorrect. The true cost was higher, possibly significantly so.

Unfortunately 03-25 is no longer available to re-run. The new 05-06 version costs $37 to run the benchmark.

Root cause analysis:
https://aider.chat/2025/05/07/gemini-cost.html

RT AI Engineer: 👀 Speaker drop! "The only conference your engineers NEEED to attend" the SOTA in AI Engineering from @saranormous @simonw @gdb @ant...

2025-05-08 06:40:43

RT AI Engineer
👀 Speaker drop!

"The only conference your engineers NEEED to attend"

the SOTA in AI Engineering from @saranormous @simonw @gdb @anthropicai @raizamrtn @ben_kus @ArtificialAnlys @jessemhan @thedanigrant @willccbb @JustinLin610 @shresbm @kwindla @ankrgyl (and a few more to be announced....)

A feature I would love to see from every single hosted API vendor is some kind of special case where if you prompt "what model ID are you?" it replies...

2025-05-07 03:17:46

A feature I would love to see from every single hosted API vendor is some kind of special case where if you prompt "what model ID are you?" it replies with a definitely-not-hallucinated stable version identifier

(If model vendors are going to start switching date-based aliases to different models now it's the least they can do!)



Simon Willison: @OfficialLoganK So gemini-2.5-pro-preview-05-06 is now an alias for gemini-2.5-pro-preview-03-25, but how about gemini-2.5-pro-exp-03-25 - has that been updated to the new model too?