DeepSeek V4.1 Flash 552B β MI325X vs MI355X Performance per Dollar
Cost per million tokens of MI325X (AMD CDNA 3) versus MI355X (AMD CDNA 4) on DeepSeek V4.1 Flash 552B. Large-hyperscaler-volume ownership TCO normalized by total tokens β performance per dollar across LLM workloads. Pick the more cost-efficient SKU at every target interactivity level. Use the chart controls below to switch sequences, precisions, and metrics β same interactions as the main inference chart.
AgentX replays real coding-agent sessions rather than fixed-length prompts, so context grows turn over turn and most of each request is served from cache instead of being recomputed. That turns the comparison into a systems question: KV transfer between nodes, prefix-aware routing, and cache capacity all move the curve alongside raw chip throughput. Fixed-sequence workloads stay the clean baseline for kernel and silicon performance, so the two scenarios answer different questions about the same hardware. Learn more about AgentX β
At 103 tok/s/user on DeepSeek V4.1 Flash 552B, MI325X costs $0.03 per million tokens; MI355X costs $0.00. MI355X is 1030% more cost-efficient at this operating point.
MI355X edges MI325X at 138 tok/s/user on DeepSeek V4.1 Flash 552B β $0.00 per million tokens versus $0.05, a 1174% cost-per-token gap.
Push DeepSeek V4.1 Flash 552B to 174 tok/s/user and MI325X lands at $0.07 per million tokens against MI355X's $0.00 β MI355X pulls ahead by 1847%. (Numbers reflect the default agentic-traces Β· fp4 selection for this URL β table and chart below update if you change sequence, precision, or model in the controls.)
Chip pricing (owning hyperscaler): MI325X $1.10/chip/hr Β· MI355X $1.50/chip/hr. Source: SemiAnalysis Market July 2026 Pricing Surveys & AI Cloud TCO Model.
| Metric | Interactivity (tok/s/user) | Interactivity (tok/s/user) | Interactivity (tok/s/user) |
|---|---|---|---|
| Dollar per Million Tokens | MI325X:$0.030MI355X:$0.003 | MI325X:$0.046MI355X:$0.004 | MI325X:$0.073MI355X:$0.004 |
| Concurrency | MI325X:~3MI355X:~52 | MI325X:~2MI355X:~32 | MI325X:~1MI355X:~32 |
Inference Performance
Agentic inference metrics from the AgentX scenario and fixed-sequence inference metrics across models, hardware configurations, and serving parameters.