GLM 5.3 FlashX Legal vs GPT-4o

Price, context window & benchmark comparison

GLM 5.3 FlashX Legal

Z.ai (Zhipu)

$0.37 / $1.25

Input / Output · per 1M tokens

GPT-4o

OpenAI

$2.50 / $10.00

Input / Output · per 1M tokens

Compare different models

Verdict: GLM 5.3 FlashX Legal is 7.4× cheaper than GPT-4o on a typical 3:1 input/output mix. GLM 5.3 FlashX Legal has the larger context window (1M vs 128K).

	GLM 5.3 FlashX Legal	GPT-4o
Input price / 1M	$0.37	$2.50
Output price / 1M	$1.25	$10.00
Blended price (3:1)	$0.59	$4.38
Cached input / 1M	$0.075	$1.25
Context window	1M	128K
Max output	131K	16K
Intelligence index	—	—
Coding index	—	—
Providers	1	—
Best provider uptime (30m)	100.0%	—
Vision input	Yes	Yes
Reasoning	Yes	No
Tool calling	Yes	Yes
Released	2026-11-02	2024-05-13
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, GLM 5.3 FlashX Legal or GPT-4o?

GLM 5.3 FlashX Legal is 7.4× cheaper than GPT-4o on a typical 3:1 input/output mix.

GLM 5.3 FlashX Legal vs GPT-4o: which has a bigger context window?

GLM 5.3 FlashX Legal: 1,048,576 tokens. GPT-4o: 128,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GLM 5.3 FlashX Legal ≈ $1,365, GPT-4o ≈ $10,000.

More comparisons