Head-to-head AI inference benchmark comparison of B300 (NVIDIA Blackwell) and MI355X (AMD CDNA 4) on Kimi K3 2.8T. Latency, throughput, and cost across LLM workloads. Use the chart controls below to switch sequences, precisions, and metrics — 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 →
B300 posts 6533 tok/s/chip for $0.10 per million tokens at 44 tok/s/user on Kimi K3 2.8T; MI355X posts 7795 tok/s/chip for $0.05. MI355X is 80% cheaper per token; MI355X delivers 19% more tok/s/chip.
Throughput at 80 tok/s/user on Kimi K3 2.8T: B300 hits 4495 tok/s/chip, MI355X hits 3602. Per-million costs land at $0.14 and $0.12 respectively. MI355X is 21% cheaper per token; B300 delivers 25% more tok/s/chip.
B300 / MI355X on Kimi K3 2.8T at 116 tok/s/user: 3443 / 2827 tok/s/chip, $0.18 / $0.15 per million tokens. MI355X is 24% cheaper per token; B300 delivers 22% more tok/s/chip. (Numbers reflect the default agentic-traces · fp4 selection for this URL — table and chart below update if you change sequence, precision, or model in the controls.)
| Metric | Interactivity (tok/s/user) | Interactivity (tok/s/user) | Interactivity (tok/s/user) |
|---|---|---|---|
| Throughput (tok/s/chip) | B300:6532.9MI355X:7794.5 | B300:4494.8MI355X:3601.9 | B300:3443.2MI355X:2826.8 |
| Cost ($/M tok) | B300:$0.096MI355X:$0.053 | B300:$0.140MI355X:$0.116 | B300:$0.182MI355X:$0.147 |
| tok/s/MW | B300:3438364MI355X:3729449 | B300:2365676MI355X:1723392 | B300:1812187MI355X:1352522 |
| Concurrency | B300:~12MI355X:~15 | B300:~7MI355X:~6 | B300:~5MI355X:~4 |
Agentic inference metrics from the AgentX scenario and fixed-sequence inference metrics across models, hardware configurations, and serving parameters.
No measurements to plot for this selection. Review the benchmark controls above or adjust quick filters.
