DeepSeek V4 vs GPT-5.5

DeepSeek V4 leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

DeepSeek V4

Faster

Tie

Detailed Comparison

Category	DeepSeek V4	GPT-5.5
Provider	DeepSeek	OpenAI
Context Window	128K	128K
Input Price ($/1M)	$0.435 WIN	$5
Output Price ($/1M)	$0.87 WIN	$30
Arena ELO	N/A	N/A
Coding	N/A	N/A
Reasoning	N/A	N/A
Speed (tokens/sec)	N/A	N/A
Open Source	Yes	No

Frequently Asked Questions

Which is cheaper, DeepSeek V4 or GPT-5.5?

DeepSeek V4 is approximately 96% cheaper than GPT-5.5 per million tokens.

Which has a larger context window?

DeepSeek V4 supports 128K context, while GPT-5.5 supports 128K.

Is DeepSeek V4 or GPT-5.5 open source?

DeepSeek V4 is open source. GPT-5.5 is proprietary.

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