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DeepSeek V4 Flash vs GPT-5.5

DeepSeek V4 Flash leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

DeepSeek V4 Flash

Faster

Tie

Detailed Comparison

CategoryDeepSeek V4 FlashGPT-5.5
ProviderDeepSeek OpenAI
Context Window128K 128K
Input Price ($/1M)$0.14 WINN/A
Output Price ($/1M)$0.28 WINN/A
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceYes No

Frequently Asked Questions

Which has a larger context window?

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

Is DeepSeek V4 Flash or GPT-5.5 open source?

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

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More Comparisons

DeepSeek V4 Flash vs Claude Opus 4.5DeepSeek V4 Flash vs Llama 4 ScoutDeepSeek V4 Flash vs Claude Sonnet 4.6DeepSeek V4 Flash vs Claude Haiku 4.5DeepSeek V4 Flash vs GLM-5.2DeepSeek V4 Flash vs Qwen 3.6DeepSeek V4 Flash vs GPT-4oDeepSeek V4 Flash vs DeepSeek R1GPT-5.5 vs Claude Opus 4.5GPT-5.5 vs Llama 4 ScoutGPT-5.5 vs Claude Sonnet 4.6GPT-5.5 vs Claude Haiku 4.5GPT-5.5 vs GLM-5.2GPT-5.5 vs Qwen 3.6GPT-5.5 vs GPT-4oGPT-5.5 vs DeepSeek R1