AMD MI355X joins AA-AgentPerf with DeepSeek V4.1 Flash results

AMD finally has a seat at the table in one of AI’s more practical benchmarks. Artificial Analysis has added the AMD Instinct MI355X to AA-AgentPerf, with results reported on October 14, 2026. The headline matchup is DeepSeek V4.1 Flash, where the MI355X still trails Nvidia’s Blackwell chips on efficiency. On the larger DeepSeek V4 Pro 0813, though, AMD’s chip flips the script against the B200. What the benchmark actually measured The MI355X is built on AMD’s CDNA 4 architecture. Each GPU carries 288 GB of HBM3E memory running at 8 TB/s, and the chip can draw up to 1,400 W. Artificial Analysis tested the accelerator on a single 8-GPU node. The setup ran ROCm nightly builds, AMD’s software stack in its freshest and least settled form, alongside developmental versions of AVM technologies. The model in focus, DeepSeek V4.1 Flash, uses a Mixture of Experts design with 552 billion parameters. Only about 8 billion active input parameters are engaged at a time. The numbers: close on speed, behind on efficiency According to Artificial Analysis, the MI355X posted output speeds on DeepSeek V4.1 Flash that rival Nvidia’s Blackwell systems. It slipped slightly behind at higher concurrency, mean...