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DeepSeek V4-Pro 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

CategoryDeepSeek V4-ProGPT-5.3-Codex
ProviderDeepSeek OpenAI
Context Window128K 128K
Input Price ($/1M)N/A $1.75 WIN
Output Price ($/1M)N/A $14 WIN
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceNo No

Frequently Asked Questions

Which has a larger context window?

DeepSeek V4-Pro supports 128K context, while GPT-5.3-Codex supports 128K.

Is DeepSeek V4-Pro or GPT-5.3-Codex open source?

DeepSeek V4-Pro is proprietary. GPT-5.3-Codex is proprietary.