Compare / head-to-head
GLM-5.1vsQwen3.5-Flash
GLM-5.1 leads 5 of 5 shared benchmarks. Qwen3.5-Flash is 18.4x cheaper per token. Qwen3.5-Flash has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
5 – 0
GLM-5.1 leads
Cheaper per token
Qwen3.5-Flash
18.4x cheaper, input + output
Larger context
Qwen3.5-Flash
1M tokens
Provider uptime (30d)
— · —
Z.ai · Qwen
GLM-5.1
Z.ai · released 2026-04-07
text
Qwen3.5-Flash
Qwen · released 2026-02-23
textvision
Quality
Benchmark matrix
5 shared · 2 only GLM-5.1 · 0 only Qwen3.5-Flash| Benchmark | GLM-5.1 | Qwen3.5-Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 89.9% ↗epoch | 82.3% ↗epoch | +7.6 pt | GLM-5.1 |
| LMArena Elo | 1462.4 ↗ | 1397.7 ↗ | +64.7 | GLM-5.1 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 36.8% ↗epoch | 9.5% ↗epoch | +27.3 pt | GLM-5.1 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 93.3% ↗epoch | 84.4% ↗epoch | +8.9 pt | GLM-5.1 |
| SimpleQA Verified | 34% ↗epoch | 20.3% ↗epoch | +13.7 pt | GLM-5.1 |
| Only GLM-5.1 reports · 2 | ||||
| AIME 2026 | 95.8% ↗matharena ⚠ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 74.2% ↗epoch | not reported | — | — |
| Only Qwen3.5-Flash reports · 0 | ||||
| Qwen3.5-Flash reports nothing GLM-5.1 does not. | ||||
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is GLM-5.1 minus Qwen3.5-Flash in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | GLM-5.1 | Qwen3.5-Flash | Edge |
|---|---|---|---|
| Context window | 200K tokens | 1M tokens | Qwen3.5-Flash |
| Max output | 131K tokens | — | — |
| Input price / 1M | $1.4 ↗ | $0.029 ↗ | Qwen3.5-Flash |
| Output price / 1M | $4.4 ↗ | $0.287 ↗ | Qwen3.5-Flash |
| Cached input / 1M | $0.26 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $5.8 | $0.316 | Qwen3.5-Flash |
| Modalities | text | text · vision | Qwen3.5-Flash |
| Released | 2026-04-07 | 2026-02-23 | — |
| Cited benchmark scores | 7 | 5 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GLM-5.1 vs …
Models sharing the most benchmarksMore matchups
Qwen3.5-Flash vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GLM-5.1 and Qwen3.5-Flash on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.