DeepSeek-V4-Flash-0731 vs GPT-5.5

GPT-5.5 leads in 3 of 8 categories

Arena ELO

Tie

Cheaper

GPT-5.5

Faster

Tie

Detailed Comparison

Category	DeepSeek-V4-Flash-0731	GPT-5.5
Provider	DeepSeek	OpenAI
Context Window	uncertain	128K WIN
Input Price ($/1M)	N/A	$5 WIN
Output Price ($/1M)	N/A	$30 WIN
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 has a larger context window?

DeepSeek-V4-Flash-0731 supports uncertain context, while GPT-5.5 supports 128K.

Is DeepSeek-V4-Flash-0731 or GPT-5.5 open source?

DeepSeek-V4-Flash-0731 is open source. GPT-5.5 is proprietary.

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