I wrote a whole guide! https://simonwillison.net/guides/agentic-engineering-patterns/ …
@simonw
-
Fable’s pelicans for thinking effort levels and API costs
By
–
Here are Fable's pelicans for the different thinking effort levels, plus how much each one cost to generate via the Claude API
-
First impressions of Claude Fable 5: slow, expensive, capable
By
–
I wrote my first impressions of Claude Fable 5 – it feels like a big model: slow, expensive and capable of handling almost everything I threw at it.
-
TIL: AgentsView to Calculate Tokens for Claude Fable 5
By
–
A TIL on using http://agentsview.io to calculate token cost with Claude Fable 5 despite the fact that this model is not yet included in the AgentsView pricing database https://til.simonwillison.net/llms/agentsview-custom-model-price …
-
AI cafe agent given spending authority despite sensible caution
By
–
Most people are sensible enough not to give purchasing authority to anything attached to an LLM This cafe-running agent got to spend money https://
andonlabs.com/blog/ai-cafe-s
tockholm
… -
AI reveals that programming goes beyond writing code
By
–
The main thing I learned as a programmer leaning heavily into AI tools is that programming is SO MUCH MORE than just writing code – and although I can get incredible results with AI, it takes every ounce of my
-
Brex’s $2,000 monthly AI allowance exceeds Uber’s $1,500 per tool
By
–
More generous allowance than Uber then, Brex are allowing $2,000/month, Uber was $1,500 (Though Uber's caps are per-tool and we don't know how many tools they support, if they allow Cursor and Copilot and Claude Code and Codex that's $6,000/month for engineers who use them all)
-
Run uvx agentsview to compare API vs subscription costs
By
–
Run "uvx agentsview usage daily –since 2026-05-04" to see how much that would have cost you in API costs (the price Uber pay) as opposed to just your individual subscription costs
-
AI too powerful, finding zero-days, nerfed before release
By
–
But it clearly was too powerful for public release – the thing is finding zero-days left right and center I entirely believe that Anthropic decided not to release it to general availability until they'd found a way to nerf it
-
Rumor: $500M monthly Anthropic bill, possibly Amazon, unlikely staff caused it
By
–
There was a rumor that a company spent $500M in a month on their Anthropic bill recently, and another rumor that it was Amazon Given they only just gave their staff access I think it's unlikely the staff ramped up to $0.5B that quickly!