Compare / head-to-head
Claude Opus 4vsGLM-5.1
GLM-5.1 leads 3 of 3 shared benchmarks. GLM-5.1 is 15.5x 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 – 3
GLM-5.1 leads
Cheaper per token
GLM-5.1
15.5x cheaper, input + output
Larger context
Tie
both 200K tokens
Provider uptime (30d)
100% · —
Anthropic · Z.ai
Claude Opus 4
Anthropic · released 2025-05-22
textvision
Quality
Benchmark matrix
3 shared · 3 only Claude Opus 4 · 4 only GLM-5.1| Benchmark | Claude Opus 4 | GLM-5.1 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| GPQA Diamond | 76.3% ↗epoch | 89.9% ↗epoch | -13.6 pt | GLM-5.1 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 64.4% ↗epoch | 93.3% ↗epoch | -28.9 pt | GLM-5.1 |
| SWE-bench Verified (Epoch AI run) | 70.7% ↗epoch | 74.2% ↗epoch | -3.5 pt | GLM-5.1 |
| Only Claude Opus 4 reports · 3 | ||||
| SWE-bench Verified | 72.5% ↗ | not reported | — | — |
| AIME 2024 (no extended thinking) | 33.9% ↗ | not reported | — | — |
| Terminal-bench | 43.2% ↗ | not reported | — | — |
| Only GLM-5.1 reports · 4 | ||||
| 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 | — | — |
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 Opus 4 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 Opus 4 | GLM-5.1 | Edge |
|---|---|---|---|
| Context window | 200K tokens | 200K tokens | Tie |
| Max output | 32K tokens | 131K tokens | GLM-5.1 |
| Input price / 1M | $15 ↗ | $1.4 ↗ | GLM-5.1 |
| Output price / 1M | $75 ↗ | $4.4 ↗ | GLM-5.1 |
| Cached input / 1M | $1.5 ↗ | $0.26 ↗ | GLM-5.1 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $90 | $5.8 | GLM-5.1 |
| Modalities | text · vision | text | Claude Opus 4 |
| Released | 2025-05-22 | 2026-04-07 | — |
| Cited benchmark scores | 6 | 7 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Opus 4 vs …
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GLM-5.1 vs …
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Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 4 and GLM-5.1 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.