GLM 5.3 FlashX Legal vs o3 Mini High

Price, context window & benchmark comparison

GLM 5.3 FlashX Legal

Z.ai (Zhipu)

$0.37 / $1.25

Input / Output · per 1M tokens

o3 Mini High

OpenAI

$1.10 / $4.40

Input / Output · per 1M tokens

Compare different models

Verdict: GLM 5.3 FlashX Legal is 3.3× cheaper than o3 Mini High on a typical 3:1 input/output mix. GLM 5.3 FlashX Legal has the larger context window (1M vs 200K).

	GLM 5.3 FlashX Legal	o3 Mini High
Input price / 1M	$0.37	$1.10
Output price / 1M	$1.25	$4.40
Blended price (3:1)	$0.59	$1.93
Cached input / 1M	$0.075	$0.55
Context window	1M	200K
Max output	131K	100K
Intelligence index	—	—
Coding index	—	16.3
Providers	1	—
Best provider uptime (30m)	100.0%	—
Vision input	Yes	No
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-11-02	2025-02-12
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, GLM 5.3 FlashX Legal or o3 Mini High?

GLM 5.3 FlashX Legal is 3.3× cheaper than o3 Mini High on a typical 3:1 input/output mix.

GLM 5.3 FlashX Legal vs o3 Mini High: which has a bigger context window?

GLM 5.3 FlashX Legal: 1,048,576 tokens. o3 Mini High: 200,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GLM 5.3 FlashX Legal ≈ $1,365, o3 Mini High ≈ $4,400.

More comparisons