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Fabien Sanglard

What Fabien Sanglard thinks about LLMs

@fabien-sanglard · 8 positions · 0 changes of mind

Programmer and writer known for detailed source code reviews of classic game engines, and author of the Game Engine Black Book series on Wolfenstein 3D and DOOM.

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4 dated positions, 2026, in their own words. Our reading of what Fabien Sanglard has said — not written or endorsed by them.

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  1. Our readingLLMs hallucinate constantly and cannot be trusted to produce code without human verification.

    design

    Their wordsLLMs constantly hallucinate and cannot be trusted. I still have to verify and iterate a lot but now I usually focus on architecture and design instead of code style.

    ↗My agent.md to improve LLM-assisted code qualityfabiensanglard.net 1st of 2 in this piece

  3. Our readingAs an LLM's context grows, it pays less attention to instructions placed in the middle than to those at the start or end.

    Their wordsAs the context grows, a model starts paying less attention to instructions in the middle of the context in favor of what is at the beginning and the end.

    ↗My agent.md to improve LLM-assisted code qualityfabiensanglard.net 2nd of 2 in this piece

  4. 6 weeks earlier

  5. Our readingProgrammers who refuse to use LLMs to code will fall behind those who do.

    Their wordsWriting every line by hand is no longer the norm. Those who refuse to use an LLM will fall behind because they won't be able to produce as much

    ↗Don't you mean extinct?fabiensanglard.net 1st of 3 in this piece

  7. Our readingCode quality still matters even as LLMs make writing code much faster.

    software quality

    Their wordsBut for everything else, code quality still matters tremendously.

    ↗Don't you mean extinct?fabiensanglard.net 2nd of 3 in this piece