Benchmarks & Tests5 min read
Voice Agents
Why Grok 4.1 Fast beats smarter models on a phone call
Overall leaderboards pick the wrong LLMs for voice calls. BenchLM's 2026 ranking puts latency first: Grok 4.1 Fast answers in 0.54s while Claude Opus 4.6, the top scorer, needs 1.78s. Fast models take the conversation; reasoning models stay on background tool calls.
2026-08-05