GPT-5.3-Codex vs MiniMax M3

GPT-5.3-Codex leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

GPT-5.3-Codex

Faster

Tie

Detailed Comparison

Category	GPT-5.3-Codex	MiniMax M3
Provider	OpenAI	MiniMax
Context Window	128K	1M WIN
Input Price ($/1M)	$1.75 WIN	N/A
Output Price ($/1M)	$14 WIN	N/A
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	Yes

Frequently Asked Questions

Which has a larger context window?

GPT-5.3-Codex supports 128K context, while MiniMax M3 supports 1M.

Is GPT-5.3-Codex or MiniMax M3 open source?

GPT-5.3-Codex is proprietary. MiniMax M3 is open source.

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