Is GPT-5.6 Terra or DeepSeek V4 Pro cheaper?

DeepSeek V4 Pro is cheaper for a typical request of 1,000 input and 500 output tokens: $0.00087 versus $0.008 for GPT-5.6 Terra, about 89% less.

What are the per-token prices of GPT-5.6 Terra and DeepSeek V4 Pro?

GPT-5.6 Terra costs $2.00 input and $12.00 output per million tokens. DeepSeek V4 Pro costs $0.435 input and $0.87 output per million tokens.

Which has the larger context window, GPT-5.6 Terra or DeepSeek V4 Pro?

GPT-5.6 Terra has the larger context window: 1.05M tokens versus 1M for DeepSeek V4 Pro.

OpenAI vs DeepSeek

GPT-5.6 Terra vs DeepSeek V4 Pro: pricing comparison

DeepSeek V4 Pro costs 9.2× less than GPT-5.6 Terra for a typical 1,000-input, 500-output request. Here is how the two compare on price, context and discounts.

Prices last updated: September 25, 2026

	GPT-5.6 Terra	DeepSeek V4 Pro
Provider	OpenAI	DeepSeek
Input per 1M tokens	$2.00	$0.435
Output per 1M tokens	$12.00	$0.87
Context window	1.05M	1M
Batch discount	50% off	Not offered
Typical request (1,000 in / 500 out)	$0.008	$0.00087
Monthly at 1,000 requests/day	$240.00	$26.10

GPT-5.6 Terra: Inputs above 272K tokens are billed at a higher long-context rate ($4 / $18).

DeepSeek V4 Pro: Open-weight model; price shown is DeepSeek's first-party API (cache-miss input).

Compare with your own numbers

Input tokens

Output tokens

Requests / day

GPT-5.6 Terra per request: $0.008
Per month: $240.00

DeepSeek V4 Pro per request: $0.00087
Per month: $26.10

Cost by task

Cost per 1,000 requests at standard prices.
Task	Tokens (in / out)	GPT-5.6 Terra	DeepSeek V4 Pro
Short chat reply	500 / 300	$4.60	$0.4785
RAG answer	6,000 / 600	$19.20	$3.13
Summarize a long document	12,000 / 1,000	$36.00	$6.09
Output-heavy generation	1,000 / 4,000	$50.00	$3.92

Output tokens usually dominate the bill — see input vs output token cost.

Frequently asked questions

Is GPT-5.6 Terra or DeepSeek V4 Pro cheaper?: DeepSeek V4 Pro is cheaper for a typical request of 1,000 input and 500 output tokens: $0.00087 versus $0.008 for GPT-5.6 Terra, about 89% less.
What are the per-token prices of GPT-5.6 Terra and DeepSeek V4 Pro?: GPT-5.6 Terra costs $2.00 input and $12.00 output per million tokens. DeepSeek V4 Pro costs $0.435 input and $0.87 output per million tokens.
Which has the larger context window, GPT-5.6 Terra or DeepSeek V4 Pro?: GPT-5.6 Terra has the larger context window: 1.05M tokens versus 1M for DeepSeek V4 Pro.

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