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GPT-4o vs GPT-5.3-Codex

GPT-4o leads in 3 of 8 categories

Arena ELO

GPT-4o

Cheaper

GPT-5.3-Codex

Faster

GPT-4o

Detailed Comparison

CategoryGPT-4oGPT-5.3-Codex
ProviderOpenAI OpenAI
Context Window128K 128K
Input Price ($/1M)$2.5 $1.75 WIN
Output Price ($/1M)$10 WIN$14
Arena ELO1285 WINN/A
Coding30.8% SWE-bench N/A
Reasoningunknown N/A
Speed (tokens/sec)~100 t/s WINN/A
Open SourceNo No

Frequently Asked Questions

Which is cheaper, GPT-4o or GPT-5.3-Codex?

GPT-4o is approximately 21% cheaper than GPT-5.3-Codex per million tokens.

Which is better for coding, GPT-4o or GPT-5.3-Codex?

GPT-4o scores 30.8% SWE-bench on coding benchmarks, while GPT-5.3-Codex scores N/A.

Which has a larger context window?

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

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

GPT-4o is proprietary. GPT-5.3-Codex is proprietary.