Concurrency Saturation Analysis

1 min readUpdated 11 March 2026

Fine-grained concurrency sweep from 500 to 1,000 concurrent requests (step 50) to identify the exact saturation knee for each model. Each concurrency level was tested across 3 independent runs with 200 requests per level.

Throughput Saturation Curves

Latency at High Concurrency

Summary

Model	Concurrency at Peak Throughput	Peak Throughput (tok/s)	p99 Latency at Peak	Throughput Range (min-max)
Qwen3-VL-235B-A22B	700	60,131 tok/s	4.27s	59,742 – 60,131 tok/s
Llama-3.1-405B	500	34,050 tok/s	7.80s	33,376 – 34,050 tok/s
DeepSeek V3.2	500	37,413 tok/s	6.49s	36,693 – 37,413 tok/s
Kimi-K2.5	650	7,340 tok/s	35.97s	7,250 – 7,340 tok/s

Key Findings

Saturation Behavior by Architecture

Qwen3-VL-235B maintains throughput around 59,700-60,100 tok/s across the entire 500-1000 range, showing the smallest active parameter footprint (22B) translates to the highest throughput ceiling.
DeepSeek V3.2 plateaus around 36,700-37,400 tok/s, with minimal variance across the sweep. The MoE routing overhead stabilizes at high concurrency.
Llama-405B sustains around 33,400-34,100 tok/s. As a dense model with FP8 quantization, it achieves remarkably high total throughput despite its 405B parameter count.
Kimi-K2.5 stabilizes around 7,250-7,340 tok/s. Despite being the largest model (1T params), TP=4 limits its parallelism bandwidth.

Practical Implications

All models are fully saturated by 500 concurrent requests. Operating beyond 750 concurrent provides no throughput benefit and only increases tail latency. For production deployments, target the 200-500 range for optimal throughput-to-latency tradeoff.

Per-Model Detail

DeepSeek V3.2

Concurrency	Throughput Mean ± CI95	Output Throughput	p99 Latency	p50 Latency
500	37,413 ± 82 tok/s	745 tok/s	6.4915s	0.3935s
550	37,106 ± 102 tok/s	744 tok/s	6.5826s	0.4376s
600	36,718 ± 1,324 tok/s	812 tok/s	6.6742s	0.4216s
650	37,157 ± 248 tok/s	755 tok/s	6.5508s	0.4080s
700	36,817 ± 709 tok/s	780 tok/s	6.6233s	0.4079s
750	36,879 ± 854 tok/s	771 tok/s	6.5957s	0.4150s
800	36,825 ± 640 tok/s	732 tok/s	6.6307s	0.4517s
850	36,693 ± 512 tok/s	753 tok/s	6.6265s	0.4142s
900	36,859 ± 662 tok/s	665 tok/s	6.5952s	0.4241s
950	36,911 ± 184 tok/s	742 tok/s	6.6158s	0.4511s
1000	36,697 ± 1,476 tok/s	897 tok/s	6.6644s	0.4148s

Llama-3.1-405B

Concurrency	Throughput Mean ± CI95	Output Throughput	p99 Latency	p50 Latency
500	34,050 ± 1,149 tok/s	2,457 tok/s	7.7987s	7.7473s
550	33,736 ± 642 tok/s	2,369 tok/s	7.8475s	7.8003s
600	33,393 ± 26 tok/s	2,464 tok/s	7.9579s	7.9149s
650	33,959 ± 1,291 tok/s	2,452 tok/s	7.8168s	7.7641s
700	33,398 ± 76 tok/s	2,457 tok/s	7.9629s	7.9076s
750	33,442 ± 25 tok/s	2,464 tok/s	7.9392s	7.8950s
800	33,406 ± 44 tok/s	2,469 tok/s	7.9690s	7.9060s
850	33,376 ± 105 tok/s	2,437 tok/s	7.9624s	7.9059s
900	33,385 ± 72 tok/s	2,464 tok/s	7.9654s	7.9142s
950	33,440 ± 41 tok/s	2,457 tok/s	7.9508s	7.8954s
1000	33,398 ± 15 tok/s	2,461 tok/s	7.9597s	7.9067s

Qwen3-VL-235B

Concurrency	Throughput Mean ± CI95	Output Throughput	p99 Latency	p50 Latency
500	60,085 ± 135 tok/s	4,528 tok/s	4.2601s	4.2342s
550	59,895 ± 163 tok/s	4,514 tok/s	4.2810s	4.2506s
600	60,014 ± 109 tok/s	4,523 tok/s	4.2684s	4.2392s
650	59,918 ± 336 tok/s	4,515 tok/s	4.2776s	4.2527s
700	60,131 ± 294 tok/s	4,531 tok/s	4.2693s	4.2358s
750	59,811 ± 132 tok/s	4,507 tok/s	4.2834s	4.2535s
800	60,062 ± 59 tok/s	4,526 tok/s	4.2637s	4.2378s
850	59,809 ± 162 tok/s	4,507 tok/s	4.2826s	4.2522s
900	59,754 ± 281 tok/s	4,503 tok/s	4.2862s	4.2552s
950	60,002 ± 284 tok/s	4,522 tok/s	4.2639s	4.2406s
1000	59,742 ± 77 tok/s	4,502 tok/s	4.2897s	4.2595s

Kimi-K2.5

Concurrency	Throughput Mean ± CI95	Output Throughput	p99 Latency	p50 Latency
500	7,316 ± 49 tok/s	552 tok/s	36.0929s	35.7474s
550	7,331 ± 45 tok/s	553 tok/s	35.9924s	35.6532s
600	7,268 ± 51 tok/s	548 tok/s	36.3368s	36.0086s
650	7,340 ± 57 tok/s	554 tok/s	35.9741s	35.5474s
700	7,282 ± 80 tok/s	549 tok/s	36.2510s	35.8314s
750	7,256 ± 92 tok/s	547 tok/s	36.3904s	36.0571s
800	7,272 ± 17 tok/s	548 tok/s	36.3158s	36.0500s
850	7,289 ± 3 tok/s	550 tok/s	36.2254s	35.7805s
900	7,250 ± 16 tok/s	547 tok/s	36.4129s	36.1525s
950	7,292 ± 56 tok/s	550 tok/s	36.2153s	35.8572s
1000	7,260 ± 94 tok/s	547 tok/s	36.3648s	35.9700s

0 Comments

Start the conversation

Be the first to comment and share your perspective with the community.