AI coding agents claim 10x speed, but end-to-end gains only 10-15%: developer's real-world experience

Even_Package_8573 · reddit · 2026-08-24

A developer with extensive experience using AI coding agents shares real-world findings: single-task coding speed is indeed 10x faster, but end-to-end efficiency (from idea to reliable release) only improves by 10-15%. The bottleneck has shifted to spec writing, code review, and QA. The author also compares Claude Opus and GLM-5.3: Opus for reasoning and planning, GLM-5.3 for handling large context.

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