Gemini 3.1 Pro Preview vs GPT-5.6 Luna

Price, context window & benchmark comparison

Gemini 3.1 Pro Preview

Google

$2.00 / $12.00

Input / Output · per 1M tokens

GPT-5.6 Luna

OpenAI

$0.20 / $1.20

Input / Output · per 1M tokens

Compare different models

Verdict: GPT-5.6 Luna is 10.0× cheaper than Gemini 3.1 Pro Preview on a typical 3:1 input/output mix. GPT-5.6 Luna scores higher on the Artificial Analysis Intelligence Index (37.3 vs 29.7). GPT-5.6 Luna has the larger context window (1.1M vs 1M).

	Gemini 3.1 Pro Preview	GPT-5.6 Luna
Input price / 1M	$2.00	$0.20
Output price / 1M	$12.00	$1.20
Blended price (3:1)	$4.50	$0.45
Cached input / 1M	$0.20	$0.02
Context window	1M	1.1M
Max output	66K	128K
Intelligence index	29.7	37.3
Coding index	68.8	71.4
Providers	—	7
Best provider uptime (30m)	—	100.0%
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-02-19	2026-07-09
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, Gemini 3.1 Pro Preview or GPT-5.6 Luna?

GPT-5.6 Luna is 10.0× cheaper than Gemini 3.1 Pro Preview on a typical 3:1 input/output mix.

Gemini 3.1 Pro Preview vs GPT-5.6 Luna: which has a bigger context window?

Gemini 3.1 Pro Preview: 1,048,576 tokens. GPT-5.6 Luna: 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 ≈ $10,000, GPT-5.6 Luna ≈ $1,000.

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