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GPT-5.3-Codex vs LongCat-2.0

GPT-5.3-Codex leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

GPT-5.3-Codex

Faster

Tie

Detailed Comparison

CategoryGPT-5.3-CodexLongCat-2.0
ProviderOpenAI Meituan
Context Window128K 128K
Input Price ($/1M)$1.75 WINN/A
Output Price ($/1M)$14 WINN/A
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceNo Yes

Frequently Asked Questions

Which has a larger context window?

GPT-5.3-Codex supports 128K context, while LongCat-2.0 supports 128K.

Is GPT-5.3-Codex or LongCat-2.0 open source?

GPT-5.3-Codex is proprietary. LongCat-2.0 is open source.