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Valkey 9.1 and Redis 8.4 Have Diverged Enough to Demand a Real Choice

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When Redis changed its license in March 2024, most teams adopted a wait-and-see approach toward Valkey, the Linux Foundation fork that was initially little more than Redis 7.4 under different governance. By mid-2026, both projects have shipped major releases with features the other lacks, making the choice a genuine technical decision rather than a governance preference. Valkey 9.1 introduces hash field-level expiration, database-scoped ACLs for multi-tenancy, optional Lua module removal for reduced attack surface, and significant memory and throughput improvements including 2.1 million requests per second on a single node. Redis 8.4, which went GA in November 2025, counters with fused full-text and vector search capabilities suited to AI-driven workloads, positioning it as the stronger platform for use cases beyond pure caching. Experts now suggest the right choice depends on workload characteristics, with Valkey favoring high-throughput cache-first deployments and Redis better serving applications requiring advanced search and data-structure features.

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