Qwen 3.8 Flash Next 176B-A6B — B200 vs MI355X Performance per Dollar
Cost per million tokens of B200 (NVIDIA Blackwell) versus MI355X (AMD CDNA 4) on Qwen 3.8 Flash Next 176B-A6B. Large-hyperscaler-volume ownership TCO normalized by total tokens — 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 — 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 →
Push Qwen 3.8 Flash Next 176B-A6B to 86 tok/s/user and B200 lands at $0.01 per million tokens against MI355X's $0.01 — MI355X pulls ahead by 10%.
B200: $0.01 per million tokens. MI355X: $0.01. Both at 106 tok/s/user on Qwen 3.8 Flash Next 176B-A6B, with B200 32% cheaper.
Toward the upper edge of the 67–145 tok/s/user interactivity band — at 125 tok/s/user — B200 runs $0.01 per million tokens on Qwen 3.8 Flash Next 176B-A6B while MI355X runs $0.02. B200 is the cheaper choice by 114%. (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.)
Chip pricing (owning hyperscaler): B200 $1.73/chip/hr · 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 | B200:$0.008MI355X:$0.007 | B200:$0.009MI355X:$0.011 | B200:$0.010MI355X:$0.021 |
| Concurrency | B200:~14MI355X:~13 | B200:~12MI355X:~8 | B200:~10MI355X:~5 |
Inference Performance
Agentic inference metrics from the AgentX scenario and fixed-sequence inference metrics across models, hardware configurations, and serving parameters.