OpenAI Codex MinivsGemini 3 Flash Preview
Gemini 3 Flash Preview is cheaper than OpenAI Codex Mini at $0.5/M vs $1.5/M input tokens.
| Spec | OpenAI Codex Mini | Gemini 3 Flash Preview |
|---|---|---|
| Input price | $1.5/M tokens | $0.5/M tokens |
| Output price | $6/M tokens | $3/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Released | May 2025 | Dec 2025 |
| SWE-bench Verified | 71.3% | 78.0% |
Our Verdict
Gemini 3 Flash Preview
OpenAI Codex MiniRunner-up
Not enough votes to call it. On the specs, Gemini 3 Flash 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
Output
$6.00
Gemini 3 Flash Preview
Input
$0.50
3.0× cheaper
Output
$3.00
2.0× cheaper
Gemini 3 Flash Preview is cheaper on both — 3.0× input, 2.0× output
Research
What we learned reading every model
FAQ
Common questions
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