81% of software teams merged AI code they did not fully understand, TestMu survey finds

Nov 13, 2026
TestMu AI's quality engineering report also finds 44% of teams see more bugs reach production as AI-written code grows.

Eighty-one percent of software teams have merged AI-generated code or tests they did not fully understand, according to a survey by TestMu AI, formerly LambdaTest. Its State of AI in Quality Engineering 2026 report also finds that 44% of teams see more bugs or incidents reach production as AI writes more of their code.

At 40% of teams AI now writes more than half of production code, yet only 41% run any automated check on AI-written code before merging; most rely on manual review. TestMu AI, which sells AI testing tools, says AI output should be checked by a system independent of the model that produced it.

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