Gemini 3.5 Flash Lite vs GPT-5.6 Luna

Price, context window & benchmark comparison

Gemini 3.5 Flash Lite

Google

$0.30 / $2.50

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 47% cheaper than Gemini 3.5 Flash Lite on a typical 3:1 input/output mix. GPT-5.6 Luna scores higher on the Artificial Analysis Intelligence Index (37.3 vs 22.2). GPT-5.6 Luna has the larger context window (1.1M vs 1M).

	Gemini 3.5 Flash Lite	GPT-5.6 Luna
Input price / 1M	$0.30	$0.20
Output price / 1M	$2.50	$1.20
Blended price (3:1)	$0.85	$0.45
Cached input / 1M	$0.03	$0.02
Context window	1M	1.1M
Max output	66K	128K
Intelligence index	22.2	37.3
Coding index	49.3	71.4
Providers	8	7
Best provider uptime (30m)	100.0%	100.0%
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-07-21	2026-07-09
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, Gemini 3.5 Flash Lite or GPT-5.6 Luna?

GPT-5.6 Luna is 47% cheaper than Gemini 3.5 Flash Lite on a typical 3:1 input/output mix.

Gemini 3.5 Flash Lite vs GPT-5.6 Luna: which has a bigger context window?

Gemini 3.5 Flash Lite: 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 3.5 Flash Lite ≈ $1,850, GPT-5.6 Luna ≈ $1,000.

More comparisons