Compare / head-to-head
GLM-5.1vsGPT-5.4 Pro
GPT-5.4 Pro leads 3 of 3 shared benchmarks. GLM-5.1 is 36.2x cheaper per token. GPT-5.4 Pro has the larger context window (1.1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 3
GPT-5.4 Pro leads
Cheaper per token
GLM-5.1
36.2x cheaper, input + output
Larger context
GPT-5.4 Pro
1.1M tokens
Provider uptime (30d)
— · 95.3079%
Z.ai · OpenAI
GLM-5.1
Z.ai · released 2026-04-07
text
GPT-5.4 Pro
OpenAI · released 2026-03-05
textvision
Quality
Benchmark matrix
3 shared · 4 only GLM-5.1 · 9 only GPT-5.4 Pro| Benchmark | GLM-5.1 | GPT-5.4 Pro | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| GPQA Diamond | 89.9% ↗epoch | 94.4% ↗ | -4.5 pt | GPT-5.4 Pro |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 36.8% ↗epoch | 82.5% ↗epoch | -45.7 pt | GPT-5.4 Pro |
| SimpleQA Verified | 34% ↗epoch | 46.3% ↗epoch | -12.3 pt | GPT-5.4 Pro |
| Only GLM-5.1 reports · 4 | ||||
| AIME 2026 | 95.8% ↗matharena ⚠ | not reported | — | — |
| LMArena Elo | 1462.4 ↗ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 93.3% ↗epoch | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 74.2% ↗epoch | not reported | — | — |
| Only GPT-5.4 Pro reports · 9 | ||||
| Humanity's Last Exam (no tools) | not reported | 42.7% ↗ | — | — |
| ARC-AGI-1 (Verified) | not reported | 94.5% ↗ | — | — |
| ARC-AGI-2 (Verified) | not reported | 83.3% ↗ | — | — |
| BrowseComp | not reported | 89.3% ↗ | — | — |
| FrontierMath Tier 1-3 | not reported | 50% ↗ | — | — |
| FrontierMath Tier 4 | not reported | 38% ↗ | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 58.5% ↗epoch | — | — |
| GDPval (wins or ties) | not reported | 82% ↗ | — | — |
| Humanity's Last Exam (with tools) | not reported | 58.7% ↗ | — | — |
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 GPT-5.4 Pro 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 | GPT-5.4 Pro | Edge |
|---|---|---|---|
| Context window | 200K tokens | 1.1M tokens | GPT-5.4 Pro |
| Max output | 131K tokens | 128K tokens | GLM-5.1 |
| Input price / 1M | $1.4 ↗ | $30 ↗ | GLM-5.1 |
| Output price / 1M | $4.4 ↗ | $180 ↗ | GLM-5.1 |
| Cached input / 1M | $0.26 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $5.8 | $210 | GLM-5.1 |
| Modalities | text | text · vision | GPT-5.4 Pro |
| Released | 2026-04-07 | 2026-03-05 | — |
| Cited benchmark scores | 7 | 13 | — |
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
GPT-5.4 Pro 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 GPT-5.4 Pro on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.