Best Robot Vacuums Under $400 According to AI (2026)

Key Takeaway

Robot Vacuums has consolidated brand authority in second run. Roborock 12-of-12 lock-in extends across 2 consecutive runs (strongest cross-run consistency we have documented for this category). Dreame and Eufy continue to hold universal mid-tier presence. iRobot is consistently positioned as "trusted but outpaced" across all 4 models — same declining-narrative pattern we documented in inaugural run, now reinforced. New brand momentum: MOVA broke into Perplexity P1 ranking (notable as no other model surfaces MOVA at this position). Eufy C28 emerged as Gemini-specific flagship-tier pick. Narwal disappeared from cross-model presence after appearing in inaugural run.

Top Brands Summary

Roborock holds 12-of-12 cross-prompt presence again, second consecutive run at full lock-in. Dreame at 11-of-12 (universal premium pick). Eufy 11-of-12 (universal value tier). iRobot 9-of-12 with notable Claude/Gemini/Perplexity dismissive framing (fallen behind on mopping). Shark 4-of-12, concentrated in ChatGPT and Gemini P2. MOVA appears in ChatGPT P3 and Perplexity P1/P3 only. Ecovacs in ChatGPT P3 and Perplexity P3. TP-Link only Perplexity P2. Eureka only Perplexity P2.