Gemma 4 vs GPT-5.3-Codex

GPT-5.3-Codex leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

GPT-5.3-Codex

Faster

Tie

Detailed Comparison

Category	Gemma 4	GPT-5.3-Codex
Provider	Google	OpenAI
Context Window	128K	128K
Input Price ($/1M)	N/A	$1.75 WIN
Output Price ($/1M)	N/A	$14 WIN
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	Yes	No

Frequently Asked Questions

Which has a larger context window?

Gemma 4 supports 128K context, while GPT-5.3-Codex supports 128K.

Is Gemma 4 or GPT-5.3-Codex open source?

Gemma 4 is open source. GPT-5.3-Codex is proprietary.

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