Is GPT-5.6 Terra or Gemini 3.8 Flash cheaper?

Gemini 3.8 Flash is cheaper for a typical request of 1,000 input and 500 output tokens: $0.002625 versus $0.008 for GPT-5.6 Terra, about 67% less.

What are the per-token prices of GPT-5.6 Terra and Gemini 3.8 Flash?

GPT-5.6 Terra costs $2.00 input and $12.00 output per million tokens. Gemini 3.8 Flash costs $0.75 input and $3.75 output per million tokens.

Which has the larger context window, GPT-5.6 Terra or Gemini 3.8 Flash?

GPT-5.6 Terra has the larger context window: 1.05M tokens versus 1.05M for Gemini 3.8 Flash.

OpenAI vs Google

GPT-5.6 Terra vs Gemini 3.8 Flash: pricing comparison

Gemini 3.8 Flash costs 3.0× 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	Gemini 3.8 Flash
Provider	OpenAI	Google
Input per 1M tokens	$2.00	$0.75
Output per 1M tokens	$12.00	$3.75
Context window	1.05M	1.05M
Batch discount	50% off	50% off
Typical request (1,000 in / 500 out)	$0.008	$0.002625
Monthly at 1,000 requests/day	$240.00	$78.75

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

Gemini 3.8 Flash: Promotional rate through 31 December 2026; scheduled to rise to $1.50 / $7.50.

Compare with your own numbers

Input tokens

Output tokens

Requests / day

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

Gemini 3.8 Flash per request: $0.002625
Per month: $78.75

Cost by task

Cost per 1,000 requests at standard prices.
Task	Tokens (in / out)	GPT-5.6 Terra	Gemini 3.8 Flash
Short chat reply	500 / 300	$4.60	$1.50
RAG answer	6,000 / 600	$19.20	$6.75
Summarize a long document	12,000 / 1,000	$36.00	$12.75
Output-heavy generation	1,000 / 4,000	$50.00	$15.75

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

Frequently asked questions

Is GPT-5.6 Terra or Gemini 3.8 Flash cheaper?: Gemini 3.8 Flash is cheaper for a typical request of 1,000 input and 500 output tokens: $0.002625 versus $0.008 for GPT-5.6 Terra, about 67% less.
What are the per-token prices of GPT-5.6 Terra and Gemini 3.8 Flash?: GPT-5.6 Terra costs $2.00 input and $12.00 output per million tokens. Gemini 3.8 Flash costs $0.75 input and $3.75 output per million tokens.
Which has the larger context window, GPT-5.6 Terra or Gemini 3.8 Flash?: GPT-5.6 Terra has the larger context window: 1.05M tokens versus 1.05M for Gemini 3.8 Flash.

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