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GPT-5.3-Codex vs Grok 4.6

Grok 4.6 leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

GPT-5.3-Codex

Faster

Tie

Detailed Comparison

CategoryGPT-5.3-CodexGrok 4.6
ProviderOpenAI xAI
Context Window128K 500K WIN
Input Price ($/1M)$1.75 WIN$2
Output Price ($/1M)$14 $6 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 is cheaper, GPT-5.3-Codex or Grok 4.6?

Grok 4.6 is approximately 49% cheaper than GPT-5.3-Codex per million tokens.

Which has a larger context window?

GPT-5.3-Codex supports 128K context, while Grok 4.6 supports 500K.

Is GPT-5.3-Codex or Grok 4.6 open source?

GPT-5.3-Codex is proprietary. Grok 4.6 is proprietary.

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