GLM 5.3 FlashX Legal vs GPT-6 Astra Pro

Price, context window & benchmark comparison

GLM 5.3 FlashX Legal

Z.ai (Zhipu)

$0.37 / $1.25

Input / Output · per 1M tokens

GPT-6 Astra Pro

OpenAI

$10.00 / $50.00

Input / Output · per 1M tokens

Compare different models

Verdict: GLM 5.3 FlashX Legal is 33.9× cheaper than GPT-6 Astra Pro on a typical 3:1 input/output mix. GPT-6 Astra Pro has the larger context window (1.1M vs 1M).

	GLM 5.3 FlashX Legal	GPT-6 Astra Pro
Input price / 1M	$0.37	$10.00
Output price / 1M	$1.25	$50.00
Blended price (3:1)	$0.59	$20.00
Cached input / 1M	$0.075	$1.00
Context window	1M	1.1M
Max output	131K	128K
Intelligence index	—	—
Coding index	—	—
Providers	1	6
Best provider uptime (30m)	100.0%	100.0%
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-11-02	2026-09-04
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, GLM 5.3 FlashX Legal or GPT-6 Astra Pro?

GLM 5.3 FlashX Legal is 33.9× cheaper than GPT-6 Astra Pro on a typical 3:1 input/output mix.

GLM 5.3 FlashX Legal vs GPT-6 Astra Pro: which has a bigger context window?

GLM 5.3 FlashX Legal: 1,048,576 tokens. GPT-6 Astra Pro: 1,050,000 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-6 Astra Pro ≈ $45,000.

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