GPT-4o vs GPT-5.5

GPT-4o leads in 4 of 8 categories

Arena ELO

GPT-4o

Cheaper

GPT-4o

Faster

GPT-4o

Detailed Comparison

Category	GPT-4o	GPT-5.5
Provider	OpenAI	OpenAI
Context Window	128K	128K
Input Price ($/1M)	$2.5 WIN	$5
Output Price ($/1M)	$10 WIN	$30
Arena ELO	1340 WIN	N/A
Coding	30.8% SWE-bench	N/A
Reasoning	unknown	N/A
Speed (tokens/sec)	~100 t/s WIN	N/A
Open Source	No	No

Frequently Asked Questions

Which is cheaper, GPT-4o or GPT-5.5?

GPT-4o is approximately 64% cheaper than GPT-5.5 per million tokens.

Which is better for coding, GPT-4o or GPT-5.5?

GPT-4o scores 30.8% SWE-bench on coding benchmarks, while GPT-5.5 scores N/A.

Which has a larger context window?

GPT-4o supports 128K context, while GPT-5.5 supports 128K.

Is GPT-4o or GPT-5.5 open source?

GPT-4o is proprietary. GPT-5.5 is proprietary.

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