OpenAI Codex MinivsGemini 3.1 Pro Preview
OpenAI Codex Mini is cheaper than Gemini 3.1 Pro Preview at $1.5/M vs $2/M input tokens.
| Spec | OpenAI Codex Mini | Gemini 3.1 Pro Preview |
|---|---|---|
| Input price | $1.5/M tokens | $2/M tokens |
| Output price | $6/M tokens | $12/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Released | May 2025 | Feb 2026 |
| SWE-bench Verified | 71.3% | 80.6% |
Our Verdict
Gemini 3.1 Pro Preview
OpenAI Codex MiniRunner-up
Not enough votes to call it. On the specs, Gemini 3.1 Pro Preview has the edge: bigger model tier, newer, bigger context window.
Slight edge
API pricing
Cost per 1M tokens
OpenAI Codex Mini
Input
$1.50
1.3× cheaper
Output
$6.00
2.0× cheaper
Gemini 3.1 Pro Preview
Input
$2.00
Output
$12.00
OpenAI Codex Mini is cheaper on both — 1.3× input, 2.0× output
Research
What we learned reading every model
FAQ
Common questions
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