What a coincidence, just yesterday I asked an LLM to generate a C compiler for the 8051 because SDCC's output was not optimized.
Within an 1.5 hour it was correctly compiling my project at 60% of the size of what SDCC generates.
One or 2 quota refreshes later it passed the SDCC test suite and optimized soft floats.
https://github.com/jyaif/cc51