DeepSeek V4 Flash vs GPT-5.6 Terra

DeepSeek V4 Flash leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

DeepSeek V4 Flash

Faster

Tie

Detailed Comparison

Category	DeepSeek V4 Flash	GPT-5.6 Terra
Provider	DeepSeek	OpenAI
Context Window	128K	128K
Input Price ($/1M)	$0.14 WIN	N/A
Output Price ($/1M)	$0.28 WIN	N/A
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 supports 128K context, while GPT-5.6 Terra supports 128K.

Is DeepSeek V4 Flash or GPT-5.6 Terra open source?

DeepSeek V4 Flash is open source. GPT-5.6 Terra is proprietary.

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GPT-5.6 rumors point to 2M context and coding gains

GPT-5.6 looks like a fix-and-upgrade release

GPT-5.6先追前端，再谈超越Mythos

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