Key Takeaways
GPT-4o wins:
- Supports vision
GLM 4.5 wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Has reasoning mode
Price Advantage
GLM 4.5
Benchmark Advantage
GPT-4o
Context Window
GLM 4.5
Speed
N/A
Pricing Comparison
Price Comparison
| Metric | GPT-4o | GLM 4.5 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $2.50 | $0.60 | GLM 4.5 |
| Output (per 1M tokens) | $10.00 | $2.20 | GLM 4.5 |
| Cache Read (per 1M) | $1.25 | $0.11 | GLM 4.5 |
Using a 3:1 input/output ratio, GLM 4.5 is 77% cheaper overall.
GPT-4o Providers
No provider data available
GLM 4.5 Providers
No provider data available
Benchmark Comparison
1
Benchmarks Compared
0
GPT-4o Wins
0
GLM 4.5 Wins
Benchmark Scores
| Benchmark | GPT-4o | GLM 4.5 | Winner |
|---|---|---|---|
Aider Real-world code editing | 74.4 | - | - |
Both models show comparable benchmark performance.
Cost vs Quality
X-axis:
Y-axis:
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Other models
Context & Performance
Context Window
GPT-4o
128,000
tokens
GLM 4.5
131,072
tokens
GLM 4.5 has a 2% larger context window.
Speed Performance
Speed benchmarks not available for these models
Capabilities
Feature Comparison
| Feature | GPT-4o | GLM 4.5 |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-4o | GLM 4.5 |
|---|---|---|
| License | Proprietary | Open Source |
| Author | OpenAI | Z-ai |
| Released | May 2024 | Jul 2025 |
GPT-4o Modalities
Input
textimagefile
Output
text
GLM 4.5 Modalities
Input
text
Output
text