DeepSeek V4-Pro vs GPT-5.6 Terra

GPT-5.6 Terra leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

GPT-5.6 Terra

Faster

Tie

Detailed Comparison

Category	DeepSeek V4-Pro	GPT-5.6 Terra
Provider	DeepSeek	OpenAI
Context Window	128K	128K
Input Price ($/1M)	N/A	$10 WIN
Output Price ($/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	No	No

Frequently Asked Questions

Which has a larger context window?

DeepSeek V4-Pro supports 128K context, while GPT-5.6 Terra supports 128K.

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

DeepSeek V4-Pro is proprietary. GPT-5.6 Terra is proprietary.

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