Kimi K3 2.8T — B200 vs MI355X
Head-to-head AI inference benchmark comparison of B200 (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 →
Throughput at 39 tok/s/user on Kimi K3 2.8T: B200 hits 5618 tok/s/chip, MI355X hits 5708. Per-million costs land at $0.09 and $0.07 respectively. MI355X is 17% cheaper per token; MI355X delivers 2% more tok/s/chip.
B200 / MI355X on Kimi K3 2.8T at 66 tok/s/user: 3446 / 2831 tok/s/chip, $0.14 / $0.15 per million tokens. B200 is 6% cheaper per token; B200 delivers 22% more tok/s/chip.
Toward the upper edge of the 13–120 tok/s/user interactivity band, at 93 tok/s/user on Kimi K3 2.8T: B200 runs 2334 tok/s/chip at $0.21/M tokens, MI355X runs 1858 at $0.22/M. B200 is 9% cheaper per token; B200 delivers 26% more tok/s/chip. (Numbers reflect the default agentic-traces · fp4 selection for this URL — table and chart below update if you change sequence, precision, or model in the controls.)
| Metric | Interactivity (tok/s/user) | Interactivity (tok/s/user) | Interactivity (tok/s/user) |
|---|---|---|---|
| Throughput (tok/s/chip) | B200:5618.4MI355X:5707.6 | B200:3446.1MI355X:2831.5 | B200:2333.6MI355X:1857.9 |
| Cost ($/M tok) | B200:$0.086MI355X:$0.073 | B200:$0.139MI355X:$0.147 | B200:$0.206MI355X:$0.224 |
| tok/s/MW | B200:3285600MI355X:2730892 | B200:2015279MI355X:1354763 | B200:1364704MI355X:888930 |
| Concurrency | B200:~20MI355X:~14 | B200:~11MI355X:~5 | B200:~7MI355X:~3 |