GPT-5 CodexvsOpenAI o4-mini
GPT-5 Codex is the newer model, released after OpenAI o4-mini.
| Spec | GPT-5 Codex | OpenAI o4-mini |
|---|---|---|
| Input price | — | $1.1/M tokens |
| Output price | — | $4.4/M tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Sep 2025 | Apr 2025 |
| SWE-bench Verified | 74.5% | 68.1% |
Our Verdict
GPT-5 Codex
OpenAI o4-miniRunner-up
Not enough votes to call it. On the specs, GPT-5 Codex has the edge: bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
GPT-5 Codex
Input
—
Output
—
OpenAI o4-mini
Input
$1.10
Output
$4.40
Where to run it
1 host
GPT-5 Codex
No hosts listed on OpenRouter.
OpenAI o4-mini1 host
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
Writing DNA
Style Comparison
Similarity
62%
GPT-5 Codex uses 229.7x more bold
GPT-5 Codex
OpenAI o4-mini
64%Vocabulary73%
17wSentence Length21w
0.38Hedging0.39
2.3Bold0.0
3.5Lists2.0
0.15Emoji0.00
0.49Headings0.00
0.05Transitions0.05
Based on 13 + 17 text responses
Research
What we learned reading every model
FAQ
Common questions
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