Key Takeaways
GPT-5 Codex wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
- Better at math
- Has reasoning mode
GPT-5.4 wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
Price Advantage
GPT-5 Codex
Benchmark Advantage
GPT-5.4
Context Window
GPT-5.4
Speed
GPT-5 Codex
Pricing Comparison
Price Comparison
| Metric | GPT-5 Codex | GPT-5.4 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.25 | $2.50 | GPT-5 Codex |
| Output (per 1M tokens) | $10.00 | $15.00 | GPT-5 Codex |
| Cache Read (per 1M) | $0.13 | $0.25 | GPT-5 Codex |
Using a 3:1 input/output ratio, GPT-5 Codex is 39% cheaper overall.
GPT-5 Codex Providers
No provider data available
GPT-5.4 Providers
No provider data available
Benchmark Comparison
6
Benchmarks Compared
0
GPT-5 Codex Wins
3
GPT-5.4 Wins
Benchmark Scores
| Benchmark | GPT-5 Codex | GPT-5.4 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 44.6 | 57.0 | |
Coding Index Code generation & understanding | 38.9 | 57.3 | |
Math Index Mathematical reasoning | 98.7 | - | - |
MMLU Pro Academic knowledge | 86.5 | - | - |
GPQA Graduate-level science | 83.7 | 92.0 | |
LiveCodeBench Competitive programming | 84.0 | - | - |
GPT-5.4 significantly outperforms in coding benchmarks.
Cost vs Quality
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GPT-5 Codex
Other models
Context & Performance
Context Window
GPT-5 Codex
400,000
tokens
GPT-5.4
1,050,000
tokens
GPT-5.4 has a 62% larger context window.
Speed Performance
| Metric | GPT-5 Codex | GPT-5.4 | Winner |
|---|---|---|---|
| Tokens/second | 187.4 tok/s | 76.9 tok/s | |
| Time to First Token | 7.89s | 179.87s |
GPT-5 Codex responds 144% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-5 Codex | GPT-5.4 |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-5 Codex | GPT-5.4 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | OpenAI |
| Released | Sep 2025 | Mar 2026 |
GPT-5 Codex Modalities
Input
textimage
Output
text
GPT-5.4 Modalities
Input
textimagefile
Output
text