Key Takeaways
GPT-4o wins:
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Supports vision
GLM 4.5 wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
Price Advantage
GLM 4.5
Benchmark Advantage
GPT-4o
Context Window
GLM 4.5
Speed
GPT-4o
Pricing Comparison
Price Comparison
| Metric | GPT-4o | GLM 4.5 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $2.50 | $0.55 | GLM 4.5 |
| Output (per 1M tokens) | $10.00 | $2.00 | GLM 4.5 |
| Cache Read (per 1M) | $1.25 | N/A | GPT-4o |
Using a 3:1 input/output ratio, GLM 4.5 is 79% cheaper overall.
GPT-4o Providers
OpenAI $2.50 (Cheapest)
Vercel $2.50 (Cheapest)
Azure $2.50 (Cheapest)
GLM 4.5 Providers
WandB $0.55 (Cheapest)
Z.AI $0.60
Nebius $0.60
Novita $0.60
Benchmark Comparison
6
Benchmarks Compared
0
GPT-4o Wins
0
GLM 4.5 Wins
Benchmark Scores
| Benchmark | GPT-4o | GLM 4.5 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 15.6 | - | - |
Coding Index Code generation & understanding | 16.6 | - | - |
GPQA Graduate-level science | 52.1 | - | - |
LiveCodeBench Competitive programming | 31.7 | - | - |
Aider Real-world code editing | 74.4 | - | - |
AIME Competition math | 11.7 | - | - |
GPT-4o significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Other models
Context & Performance
Context Window
GPT-4o
128,000
tokens
Max output: 16,384 tokens
GLM 4.5
131,000
tokens
Max output: 131,000 tokens
GLM 4.5 has a 2% larger context window.
Speed Performance
| Metric | GPT-4o | GLM 4.5 | Winner |
|---|---|---|---|
| Tokens/second | 86.1 tok/s | N/A | |
| Time to First Token | 0.58s | N/A |
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 | Proprietary |
| Author | OpenAI | Z-ai |
| Released | May 2024 | Jul 2025 |
GPT-4o Modalities
Input
textimagefile
Output
text
GLM 4.5 Modalities
Input
text
Output
text