Claude Fable 5 vs Real QA testing. The results are brutal!

Anthropic says Claude Fable 5 doesn't just write code — it checks its own work. I've spent my whole career in QA, so that claim is aimed straight at my job. I gave it my real product (PromptGym), let it build a feature end to end, then asked it to verify its own work as a QA engineer. It ran its tests, said "safe to ship" with 90% confidence, and recommended I push to production. So I did — and then I tested it the way a real customer would. What happened next is exactly why "building got cheap, but knowing it works didn't." ⏱️ Chapters 0:00 The claim — "it checks its own work" 0:53 The product under test: PromptGym 3:58 The stress test — 3 prompts 4:29 Prompt 1 — build the feature end to end 7:19 What it shipped (and the 2 bugs it caught itself) 8:01 Prompt 2 — "now QA your own work" 8:44 The bet 9:21 Push to production 10:30 Its verdict: safe to ship — 90% confident 11:09 Testing it live, as a real customer 13:30 The kill shot — the link goes home 14:24 Final verdict — do not ship #ClaudeFable5 #Fable5 #Anthropic #AITesting #QAEngineer #SoftwareTesting #AICoding