pi.py day: "vibe coding" with AI

How good is AI for writing code?
Generating unlimited digits of "pi" is not an easy task.
So I prompted Sonnet 3.7 (on Claude, made by Anthropic) to do it.
And it did! See code below.
This is apparently now called "Vibe coding" :)

Pi Day - Wikipedia

Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (the 3rd month) since 3, 1, and 4 are the first three significant figures of π

before we look at fancy AI solution, let's se result of "HI" (Human Intelligence)

decimals = 1000; x = 3 * (10 ** int(decimals + 20)); i = 1; pi = x

while x > 0: x = x * i // ((i + 1) * 4); pi += x // (i + 2); i += 2

print(pi // (10 ** 20))

or equivalent in JavaScript:

let decimals = 1, i = 1n, x = 3n * (10n ** BigInt(decimals + 20)), pi = x;

while (x > 0) { x = x * i / ((i + 1n) * 4n); pi += x / (i + 2n); i += 2n; }

console.log(pi / (10n ** 20n));

This is much more compact and faster than AI solution below, and is based on this:

DraganSr: Pi: A Million Digits of Pi in 9 Lines of Javascript (2024)

The speed advantage is because BigInt is faster than "decimal".

DraganSr: "Pi" day: pi digits & code (2022) 

another previous multi-language solution.

Anthropic CEO, Dario Amodei: in the next 3 to 6 months, AI is writing 90% of the code, and in 12 months, nearly all code may be generated by AI : r/singularity

Vibe coding - Wikipedia

Vibe coding is an AI-dependent computer programming practice where a person describes a problem in a few sentences as a prompt to a large language model (LLM) tuned for coding. The LLM generates software, freeing the programmer from having to write and debug the underlying code.[1][2][3] Vibe coding is claimed by its advocates to allow even amateur programmers to produce software without the extensive training and skills which coding previously needed.[4] The term was introduced by Andrej Karpathy in February 2025