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It's weird how much worse google is at code generation when AlphaCode was already so much stronger than gpt4 today at code generation a year ago:

(alphacode achieved a codeforces rating of ~1300. i think gpt4 is at 392)

AlphaCode is more specialized in programming (competitive programming to be precise) though whilst GPT4 is much more generalized.

AlphaCode also tries dozens of solutions for one problem, not sure if GPT4 does this.

Also, for alphacode paper author built/had tests, and only example passing tests were submitted for final verification.

It's a matter of cost and resources. Alphacode was surely running on unbounded hardware.