Compare / head-to-head
Claude Sonnet 5vsGLM-5.1
Claude Sonnet 5 leads 3 of 4 shared benchmarks. GLM-5.1 is 2.1x cheaper per token. Claude Sonnet 5 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
3 – 1
Claude Sonnet 5 leads
Cheaper per token
GLM-5.1
2.1x cheaper, input + output
Larger context
Claude Sonnet 5
1M tokens
Provider uptime (30d)
100% · —
Anthropic · Z.ai
Claude Sonnet 5
Anthropic · released 2026-06-30
textvision
Quality
Benchmark matrix
4 shared · 4 only Claude Sonnet 5 · 3 only GLM-5.1| Benchmark | Claude Sonnet 5 | GLM-5.1 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 4 | ||||
| GPQA Diamond | 90.5% ↗epoch | 89.9% ↗epoch | +0.6 pt | Claude Sonnet 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 65.6% ↗epoch | 36.8% ↗epoch | +28.8 pt | Claude Sonnet 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 94.7% ↗epoch | 93.3% ↗epoch | +1.4 pt | Claude Sonnet 5 |
| SimpleQA Verified | 33.7% ↗epoch | 34% ↗epoch | -0.3 pt | GLM-5.1 |
| Only Claude Sonnet 5 reports · 4 | ||||
| SWE-bench Verified | 85.2% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 43.2% ↗ | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 29.3% ↗epoch | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.4% ↗ | not reported | — | — |
| Only GLM-5.1 reports · 3 | ||||
| AIME 2026 | not reported | 95.8% ↗matharena ⚠ | — | — |
| LMArena Elo | not reported | 1462.4 ↗ | — | — |
| 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 Sonnet 5 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 Sonnet 5 | GLM-5.1 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 200K tokens | Claude Sonnet 5 |
| Max output | 128K tokens | 131K tokens | GLM-5.1 |
| Input price / 1M | $2 ↗ | $1.4 ↗ | GLM-5.1 |
| Output price / 1M | $10 ↗ | $4.4 ↗ | GLM-5.1 |
| Cached input / 1M | $0.2 ↗ | $0.26 ↗ | Claude Sonnet 5 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12 | $5.8 | GLM-5.1 |
| Modalities | text · vision | text | Claude Sonnet 5 |
| Released | 2026-06-30 | 2026-04-07 | — |
| Cited benchmark scores | 8 | 7 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Sonnet 5 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 Sonnet 5 and GLM-5.1 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.