Gemini 3.5 Flash vs GPT-5.3-Codex
Gemini 3.5 Flash leads in 3 of 8 categories
Arena ELO
Tie
Cheaper
Gemini 3.5 Flash
Faster
Tie
Detailed Comparison
| Category | Gemini 3.5 Flash | GPT-5.3-Codex |
|---|---|---|
| Provider | OpenAI | |
| Context Window | 1M WIN | 128K |
| Input Price ($/1M) | $1.5 WIN | $1.75 |
| Output Price ($/1M) | $9 WIN | $14 |
| Arena ELO | N/A | N/A |
| Coding | N/A | N/A |
| Reasoning | N/A | N/A |
| Speed (tokens/sec) | N/A | N/A |
| Open Source | No | No |
Frequently Asked Questions
Which is cheaper, Gemini 3.5 Flash or GPT-5.3-Codex?
Gemini 3.5 Flash is approximately 33% cheaper than GPT-5.3-Codex per million tokens.
Which has a larger context window?
Gemini 3.5 Flash supports 1M context, while GPT-5.3-Codex supports 128K.
Is Gemini 3.5 Flash or GPT-5.3-Codex open source?
Gemini 3.5 Flash is proprietary. GPT-5.3-Codex is proprietary.
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