Key Takeaways
GPT-4o-mini wins:
- Cheaper input tokens
- Cheaper output tokens
GPT-5 Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
GPT-4o-mini
Benchmark Advantage
GPT-5 Codex
Context Window
GPT-5 Codex
Speed
GPT-5 Codex
Pricing Comparison
Price Comparison
| Metric | GPT-4o-mini | GPT-5 Codex | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.15 | $1.25 | GPT-4o-mini |
| Output (per 1M tokens) | $0.60 | $10.00 | GPT-4o-mini |
| Cache Read (per 1M) | $75000.00 | $125000.00 | GPT-4o-mini |
Using a 3:1 input/output ratio, GPT-4o-mini is 92% cheaper overall.
GPT-4o-mini Providers
OpenAI $0.15 (Cheapest)
Vercel $0.15 (Cheapest)
Azure $0.15 (Cheapest)
GPT-5 Codex Providers
OpenAI $1.25 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
0
GPT-4o-mini Wins
5
GPT-5 Codex Wins
Benchmark Scores
| Benchmark | GPT-4o-mini | GPT-5 Codex | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 12.6 | 44.5 | |
Coding Index Code generation & understanding | - | 38.9 | - |
Math Index Mathematical reasoning | 14.7 | 98.7 | |
MMLU Pro Academic knowledge | 64.8 | 86.5 | |
GPQA Graduate-level science | 42.6 | 83.7 | |
LiveCodeBench Competitive programming | 23.4 | 84.0 | |
Aider Real-world code editing | 55.6 | - | - |
AIME Competition math | 11.7 | - | - |
GPT-5 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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GPT-4o-mini
Other models
Context & Performance
Context Window
GPT-4o-mini
128,000
tokens
Max output: 16,384 tokens
GPT-5 Codex
400,000
tokens
Max output: 128,000 tokens
GPT-5 Codex has a 68% larger context window.
Speed Performance
| Metric | GPT-4o-mini | GPT-5 Codex | Winner |
|---|---|---|---|
| Tokens/second | 52.3 tok/s | 314.7 tok/s | |
| Time to First Token | 0.46s | 10.95s |
GPT-5 Codex responds 501% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-4o-mini | GPT-5 Codex |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-4o-mini | GPT-5 Codex |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | OpenAI |
| Released | Jul 2024 | Sep 2025 |
GPT-4o-mini Modalities
Input
textimagefile
Output
text
GPT-5 Codex Modalities
Input
textimage
Output
text