Compare / head-to-head
GLM-4.5-FlashvsGPT-4o
GLM-4.5-Flash and GPT-4o do not yet share a public benchmark, so quality cannot be compared apples-to-apples. GLM-4.5-Flash has the larger context window (200K tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0
no overlap yet
Cheaper per token
GLM-4.5-Flash
list price, input + output
Larger context
GLM-4.5-Flash
200K tokens
Provider uptime (30d)
— · 95.4802%
Z.ai · OpenAI
GLM-4.5-Flash
Z.ai
text
Quality
Benchmark matrix
0 shared · 0 only GLM-4.5-Flash · 8 only GPT-4o| Benchmark | GLM-4.5-Flash | GPT-4o | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 0 | ||||
| No public benchmark is reported for both models yet. | ||||
| Only GLM-4.5-Flash reports · 0 | ||||
| GLM-4.5-Flash reports nothing GPT-4o does not. | ||||
| Only GPT-4o reports · 8 | ||||
| GPQA Diamond | not reported | 46% ↗ | — | — |
| MMLU | not reported | 85.7% ↗ | — | — |
| AIME 2025 | not reported | 11.7% ↗matharena | — | — |
| AIME 2024 | not reported | 13.1% ↗ | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 0.4% ↗epoch | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | not reported | 6.4% ↗epoch | — | — |
| SimpleQA Verified | not reported | 26% ↗epoch | — | — |
| SWE-bench Verified (Epoch AI run) | not reported | 31% ↗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 GLM-4.5-Flash minus GPT-4o 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-4.5-Flash | GPT-4o | Edge |
|---|---|---|---|
| Context window | 200K tokens | 128K tokens | GLM-4.5-Flash |
| Max output | 98K tokens | 16K tokens | GLM-4.5-Flash |
| Input price / 1M | $0 ↗ | $2.5 ↗ | GLM-4.5-Flash |
| Output price / 1M | $0 ↗ | $10 ↗ | GLM-4.5-Flash |
| Cached input / 1M | $0 ↗ | $1.25 ↗ | GLM-4.5-Flash |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0 | $12.5 | GLM-4.5-Flash |
| Modalities | text | text · vision | GPT-4o |
| Released | — | 2024-05-13 | — |
| Cited benchmark scores | 0 | 9 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-4o vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GLM-4.5-Flash and GPT-4o on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.