Key Takeaways
GPT-5.3 Codex wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
GLM-4.7-Flash wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
Price Advantage
GLM-4.7-Flash
Benchmark Advantage
GPT-5.3 Codex
Context Window
GPT-5.3 Codex
Speed
GLM-4.7-Flash
Pricing Comparison
Price Comparison
| Metric | GPT-5.3 Codex | GLM-4.7-Flash | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.75 | $0.06 | GLM-4.7-Flash |
| Output (per 1M tokens) | $14.00 | $0.40 | GLM-4.7-Flash |
| Cache Read (per 1M) | $0.17 | $0.01 | GLM-4.7-Flash |
Using a 3:1 input/output ratio, GLM-4.7-Flash is 97% cheaper overall.
GPT-5.3 Codex Providers
No provider data available
GLM-4.7-Flash Providers
No provider data available
Benchmark Comparison
3
Benchmarks Compared
3
GPT-5.3 Codex Wins
0
GLM-4.7-Flash Wins
Benchmark Scores
| Benchmark | GPT-5.3 Codex | GLM-4.7-Flash | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 54.0 | 22.1 | |
Coding Index Code generation & understanding | 53.1 | 11.0 | |
GPQA Graduate-level science | 91.5 | 45.2 |
GPT-5.3 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Other models
Context & Performance
Context Window
GPT-5.3 Codex
400,000
tokens
GLM-4.7-Flash
202,752
tokens
GPT-5.3 Codex has a 49% larger context window.
Speed Performance
| Metric | GPT-5.3 Codex | GLM-4.7-Flash | Winner |
|---|---|---|---|
| Tokens/second | 63.8 tok/s | 87.8 tok/s | |
| Time to First Token | 83.49s | 0.71s |
GLM-4.7-Flash responds 38% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-5.3 Codex | GLM-4.7-Flash |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-5.3 Codex | GLM-4.7-Flash |
|---|---|---|
| License | Proprietary | Open Source |
| Author | OpenAI | Z-ai |
| Released | Feb 2026 | Jan 2026 |
GPT-5.3 Codex Modalities
Input
textimage
Output
text
GLM-4.7-Flash Modalities
Input
text
Output
text