Gemini 2.5 Flash vs GPT-5.3-Codex
Gemini 2.5 Flash leads in 5 of 8 categories
Arena ELO
Gemini 2.5 Flash
Cheaper
Gemini 2.5 Flash
Faster
Gemini 2.5 Flash
Detailed Comparison
| Category | Gemini 2.5 Flash | GPT-5.3-Codex |
|---|---|---|
| Provider | OpenAI | |
| Context Window | 1M WIN | 128K |
| Input Price ($/1M) | $0.3 WIN | $1.75 |
| Output Price ($/1M) | $2.5 WIN | $14 |
| Arena ELO | 1362 WIN | N/A |
| Coding | unknown | N/A |
| Reasoning | unknown | N/A |
| Speed (tokens/sec) | ~150 t/s WIN | N/A |
| Open Source | No | No |
Frequently Asked Questions
Which is cheaper, Gemini 2.5 Flash or GPT-5.3-Codex?
Gemini 2.5 Flash is approximately 82% cheaper than GPT-5.3-Codex per million tokens.
Which is better for coding, Gemini 2.5 Flash or GPT-5.3-Codex?
Gemini 2.5 Flash scores unknown on coding benchmarks, while GPT-5.3-Codex scores N/A.
Which has a larger context window?
Gemini 2.5 Flash supports 1M context, while GPT-5.3-Codex supports 128K.
Is Gemini 2.5 Flash or GPT-5.3-Codex open source?
Gemini 2.5 Flash is proprietary. GPT-5.3-Codex is proprietary.
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