Key Takeaways
Phi-3 Medium 128K Instruct wins:
- Cheaper input tokens
- Cheaper output tokens
GPT-5.1-Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports vision
- Has reasoning mode
Price Advantage
Phi-3 Medium 128K Instruct
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 | Phi-3 Medium 128K Instruct | GPT-5.1-Codex |
|---|---|---|
Vision (Image Input) | ||
Tool/Function Calls | ||
Reasoning Mode | ||
Audio Input | ||
Audio Output | ||
PDF Input | ||
Prompt Caching | ||
Web Search |
License & Release
| Property | Phi-3 Medium 128K Instruct | GPT-5.1-Codex |
|---|---|---|
| License | Open Source | Proprietary |
| Author | Microsoft | OpenAI |
| Released | Unknown | Nov 2025 |
Phi-3 Medium 128K Instruct Modalities
Input
Output
GPT-5.1-Codex Modalities
Input
textimage
Output
text