It doesn't have class support yet!
But it doesn't matter, because LLMs that try to use a class will get an error message and rewrite their code to not use classes instead.
Notes on how I got the WASM build working here: https://simonwillison.net/2026/Feb/6/pydantic-monty/
This is true in a sense, but every little papercut at the lower levels of abstraction degrades performance at higher levels as the LLM needs to spend its efforts on hacking around jank in the Python interpreter instead of solving the real problem.
Reminds of evolutionary debate. Whats important is just because something can learn to adapt doesnt mean theyll find an optimized adaption, nor will they continually refine it.
As far as i can tell AI will only solve problems well where the problem space is properly defined. Most people wont know how to do that.
My models are writing code all day in 3/4 different languages, why would I want to:
a) Restrict them to Python
b) Restrict them to a cutdown, less-useful version of Python?
My models write me Typescript and C# and Python all day with zero issues. Why do I need this?
Is this mostly just for codemode where the MCP calls instead go through a Monty function call? Is it to do some quick maths or pre/post-processing to answer queries? Or maybe to implement CaMeL?
It feels like the power of terminal agents is partly because they can access the network/filesystem, and so sandboxed containers are a natural extension?
> Monty avoids the cost, latency, complexity and general faff of using full container based sandbox for running LLM generated code.
> Instead, it let's you safely run Python code written by an LLM embedded in your agent, with startup times measured in single digit microseconds not hundreds of milliseconds.
Only if the training data has enough Python code that doesn't use classes.
(We're in luck that these things are trained on Stackoverflow code snippets.)