GPT-4 Turbo Preview vs GPT-5 Codex
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for GPT-4 Turbo Preview and GPT-5 Codex.
GPT-4 Turbo Preview
The preview GPT-4 model with improved instruction following, JSON mode, reproducible outputs, parallel function calling, and more. Training data: up to Dec 2023. **Note:** heavily rate limited by OpenAI while...
GPT-5 Codex
GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Technical Specifications
| Specification | GPT-4 Turbo Preview | GPT-5 Codex |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Context Window | 128,000 tokens | 400,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2024-01-25 | 2025-09-23 |
API Pricing Comparison
Input Price per Million Tokens
GPT-4 Turbo Preview
$10.00
GPT-5 Codex
$1.25
Output Price per Million Tokens
GPT-4 Turbo Preview
$30.00
GPT-5 Codex
$10.00
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
GPT-4 Turbo Preview Quirks & Gotchas
No developer gotchas reported.
GPT-5 Codex Quirks & Gotchas
No developer gotchas reported.