Gemini 3 Flash vs GPT-5.2 Codex: Specs & Benchmark Comparison
| Characteristic | Gemini 3 Flash | GPT-5.2 Codex |
|---|---|---|
| Company | OpenAI | |
| Release Date | December 16, 2025 | January 13, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 400K |
| Context (output) | 66K | 128K |
| Input Price / 1M | $0.50 | $1.75 |
| Output Price / 1M | $3.00 | $14.00 |
| Average Score | 0.9 | 0.6 |
Verdict
Gemini 3 Flash leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Gemini 3 Flash — 0.9, GPT-5.2 Codex — 0.6.
API Cost
Gemini 3 Flash is 4.5x cheaper: input $0.50/1M vs $1.75/1M tokens.
Context Window
Gemini 3 Flash supports a larger context: 1M vs 400K tokens.
Recency
GPT-5.2 Codex is newer: released 1/13/2026 vs 12/16/2025.
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The Gemini 3 Flash and GPT-5.2 Codex comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Gemini 3 Flash or GPT-5.2 Codex page. See also the complete list of AI model comparisons.