Letta launches FrontierMemory, an agent-memory benchmark scored by downstream task performance
carsonfarmer · x · 2026-10-22
Letta introduced FrontierMemory, a new benchmark evaluating agent memory via downstream task performance rather than recall, which existing benchmarks have saturated via agentic search. The leaderboard: Opus 5.5 (max) and GLM-5.3 (max) tie at 73.3% ($2.80/$3.58 task cost), Kimi K3 (max) at 66.7%, GPT-6.1 Sol (max) and Gemini 4 Argon (high) at 60.0% (GPT-6.1 cheapest at $0.77), with Muse Wonder at 46.7% and Grok 4.7 at 33.3%.
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