Gemini 3.1 Pro Preview Custom Tools vs GPT-6.1 Terra

Price, context window & benchmark comparison

Gemini 3.1 Pro Preview Custom Tools

Google

$2.00 / $12.00

Input / Output · per 1M tokens

GPT-6.1 Terra

OpenAI

$1.00 / $5.00

Input / Output · per 1M tokens

Compare different models

Verdict: GPT-6.1 Terra is 2.3× cheaper than Gemini 3.1 Pro Preview Custom Tools on a typical 3:1 input/output mix. GPT-6.1 Terra has the larger context window (1.1M vs 1M).

	Gemini 3.1 Pro Preview Custom Tools	GPT-6.1 Terra
Input price / 1M	$2.00	$1.00
Output price / 1M	$12.00	$5.00
Blended price (3:1)	$4.50	$2.00
Cached input / 1M	$0.20	$0.05
Context window	1M	1.1M
Max output	66K	128K
Intelligence index	—	51.3
Coding index	—	—
Providers	—	7
Best provider uptime (30m)	—	100.0%
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-02-25	2026-10-26
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, Gemini 3.1 Pro Preview Custom Tools or GPT-6.1 Terra?

GPT-6.1 Terra is 2.3× cheaper than Gemini 3.1 Pro Preview Custom Tools on a typical 3:1 input/output mix.

Gemini 3.1 Pro Preview Custom Tools vs GPT-6.1 Terra: which has a bigger context window?

Gemini 3.1 Pro Preview Custom Tools: 1,048,576 tokens. GPT-6.1 Terra: 1,050,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Gemini 3.1 Pro Preview Custom Tools ≈ $10,000, GPT-6.1 Terra ≈ $4,500.

More comparisons