Gemini 3 Flash Preview vs GPT-6 Luna

Price, context window & benchmark comparison

Gemini 3 Flash Preview

Google

$0.50 / $3.00

Input / Output · per 1M tokens

GPT-6 Luna

OpenAI

$0.10 / $0.50

Input / Output · per 1M tokens

Compare different models

Verdict: GPT-6 Luna is 5.6× cheaper than Gemini 3 Flash Preview on a typical 3:1 input/output mix. GPT-6 Luna has the larger context window (1.1M vs 1M).

	Gemini 3 Flash Preview	GPT-6 Luna
Input price / 1M	$0.50	$0.10
Output price / 1M	$3.00	$0.50
Blended price (3:1)	$1.13	$0.20
Cached input / 1M	$0.05	$0.01
Context window	1M	1.1M
Max output	66K	128K
Intelligence index	—	37.3
Coding index	—	—
Providers	—	7
Best provider uptime (30m)	—	100.0%
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2025-12-17	2026-09-22
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, Gemini 3 Flash Preview or GPT-6 Luna?

GPT-6 Luna is 5.6× cheaper than Gemini 3 Flash Preview on a typical 3:1 input/output mix.

Gemini 3 Flash Preview vs GPT-6 Luna: which has a bigger context window?

Gemini 3 Flash Preview: 1,048,576 tokens. GPT-6 Luna: 1,050,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Gemini 3 Flash Preview ≈ $2,500, GPT-6 Luna ≈ $450.00.

More comparisons