Gemini 3.1 Pro Preview vs GLM 5.3 Flash

Price, context window & benchmark comparison

Gemini 3.1 Pro Preview

Google

$2.00 / $12.00

Input / Output · per 1M tokens

GLM 5.3 Flash

Z.ai (Zhipu)

$0.15 / $0.50

Input / Output · per 1M tokens

Compare different models

Verdict: GLM 5.3 Flash is 18.9× cheaper than Gemini 3.1 Pro Preview on a typical 3:1 input/output mix. GLM 5.3 Flash scores higher on the Artificial Analysis Intelligence Index (41.8 vs 29.7). GLM 5.3 Flash has the larger context window (1.3M vs 1M).

	Gemini 3.1 Pro Preview	GLM 5.3 Flash
Input price / 1M	$2.00	$0.15
Output price / 1M	$12.00	$0.50
Blended price (3:1)	$4.50	$0.24
Cached input / 1M	$0.20	$0.05
Context window	1M	1.3M
Max output	66K	944K
Intelligence index	29.7	41.8
Coding index	68.8	71.5
Providers	—	31
Best provider uptime (30m)	—	100.0%
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-02-19	2026-08-26
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, Gemini 3.1 Pro Preview or GLM 5.3 Flash?

GLM 5.3 Flash is 18.9× cheaper than Gemini 3.1 Pro Preview on a typical 3:1 input/output mix.

Gemini 3.1 Pro Preview vs GLM 5.3 Flash: which has a bigger context window?

Gemini 3.1 Pro Preview: 1,048,576 tokens. GLM 5.3 Flash: 1,310,720 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Gemini 3.1 Pro Preview ≈ $10,000, GLM 5.3 Flash ≈ $550.00.

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