Key Takeaways
GPT-5.1-Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at math
- Supports vision
GLM 5 wins:
- Cheaper input tokens
- Cheaper output tokens
- Better at coding
Price Advantage
GLM 5
Benchmark Advantage
GPT-5.1-Codex
Context Window
GPT-5.1-Codex
Speed
GPT-5.1-Codex
Pricing Comparison
Benchmark Comparison
Context & Performance
Capabilities
Feature Comparison
| Feature | GPT-5.1-Codex | GLM 5 |
|---|---|---|
Vision (Image Input) | ||
Tool/Function Calls | ||
Reasoning Mode | ||
Audio Input | ||
Audio Output | ||
PDF Input | ||
Prompt Caching | ||
Web Search |
License & Release
| Property | GPT-5.1-Codex | GLM 5 |
|---|---|---|
| License | Proprietary | Open Source |
| Author | OpenAI | Z-ai |
| Released | Nov 2025 | Feb 2026 |
GPT-5.1-Codex Modalities
Input
textimage
Output
text
GLM 5 Modalities
Input
text
Output
text