V4.1 Flash review: top of Flash tier but wild hallucination swings, tester wary of V4.1 Pro
teortaxesTex · x · 2026-10-07
User @LeroyLi311063 shares hands-on observations of V4.1 Flash: it's the strongest overall among Flash-tier LLMs, but hallucinations drag it down, swinging wildly between "god and maggot."
- It sometimes resolves "diamond-tier" bugs that only Grok 4.7/Opus 5-class models could handle — a Bilibili creator even makes code-review shows from his company's real legacy-code bugs
- Other times it fails on "silver-tier" bugs even Doubao can one-shot; performance feels random
- The hallucination issue also affects V4 Pro on hard long tasks; V4.1 Flash improves but still trails frontier models, so the tester is wary of V4.1 Pro
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