I Tested GPT-5 as a Coding Agent—Here’s What Happened

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​ I put GPT-5 inside Cursor to build a real macOS speech-to-text app I actually use. Starting from a PRD, it coded a menu-bar recorder with hotkeys, a model picker (Whisper MLX + Qwen 1.7B), audio cues, and an LLM pass to fix transcription errors. Watch the full agentic-coding workflow—bugs and fixes included.

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00:00 Specs Driven Development
00:39 Product Requirements Doc
01:58 Initial Implementation
02:22 Testing and Debugging
03:43 Feature Enhancements
05:49 Final Testing   Read More Prompt Engineering 

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