Compare / head-to-head
Claude 3.5 SonnetvsGLM-5.1
GLM-5.1 leads 2 of 2 shared benchmarks. GLM-5.1 is 3.1x cheaper per token. Both offer a 200K-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 2
GLM-5.1 leads
Cheaper per token
GLM-5.1
3.1x cheaper, input + output
Larger context
Tie
both 200K tokens
Provider uptime (30d)
100% · —
Anthropic · Z.ai
Claude 3.5 Sonnet
Anthropic · released 2024-10-22
textvision
Quality
Benchmark matrix
2 shared · 2 only Claude 3.5 Sonnet · 5 only GLM-5.1| Benchmark | Claude 3.5 Sonnet | GLM-5.1 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 2 | ||||
| GPQA Diamond | 55.3% ↗epoch | 89.9% ↗epoch | -34.6 pt | GLM-5.1 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 8.5% ↗epoch | 93.3% ↗epoch | -84.8 pt | GLM-5.1 |
| Only Claude 3.5 Sonnet reports · 2 | ||||
| SWE-bench Verified | 49% ↗ | not reported | — | — |
| AIME 2025 | 3.3% ↗matharena | not reported | — | — |
| Only GLM-5.1 reports · 5 | ||||
| AIME 2026 | not reported | 95.8% ↗matharena ⚠ | — | — |
| LMArena Elo | not reported | 1462.4 ↗ | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 36.8% ↗epoch | — | — |
| SimpleQA Verified | not reported | 34% ↗epoch | — | — |
| SWE-bench Verified (Epoch AI run) | not reported | 74.2% ↗epoch | — | — |
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 Claude 3.5 Sonnet minus GLM-5.1 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 | Claude 3.5 Sonnet | GLM-5.1 | Edge |
|---|---|---|---|
| Context window | 200K tokens | 200K tokens | Tie |
| Max output | 8K tokens | 131K tokens | GLM-5.1 |
| Input price / 1M | $3 ↗ | $1.4 ↗ | GLM-5.1 |
| Output price / 1M | $15 ↗ | $4.4 ↗ | GLM-5.1 |
| Cached input / 1M | $0.3 ↗ | $0.26 ↗ | GLM-5.1 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $18 | $5.8 | GLM-5.1 |
| Modalities | text · vision | text | Claude 3.5 Sonnet |
| Released | 2024-10-22 | 2026-04-07 | — |
| Cited benchmark scores | 4 | 7 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude 3.5 Sonnet vs …
Models sharing the most benchmarksMore matchups
GLM-5.1 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude 3.5 Sonnet and GLM-5.1 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.