GLM 5.3 FlashX Legal vs GPT-5.6 Sol Pro

Price, context window & benchmark comparison

GLM 5.3 FlashX Legal

Z.ai (Zhipu)

$0.37 / $1.25

Input / Output · per 1M tokens

GPT-5.6 Sol Pro

OpenAI

$4.00 / $20.00

Input / Output · per 1M tokens

Compare different models

Verdict: GLM 5.3 FlashX Legal is 13.6× cheaper than GPT-5.6 Sol Pro on a typical 3:1 input/output mix. GPT-5.6 Sol Pro has the larger context window (1.1M vs 1M).

	GLM 5.3 FlashX Legal	GPT-5.6 Sol Pro
Input price / 1M	$0.37	$4.00
Output price / 1M	$1.25	$20.00
Blended price (3:1)	$0.59	$8.00
Cached input / 1M	$0.075	$0.40
Context window	1M	1.1M
Max output	131K	128K
Intelligence index	—	—
Coding index	—	—
Providers	1	—
Best provider uptime (30m)	100.0%	—
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-11-02	2026-07-09
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, GLM 5.3 FlashX Legal or GPT-5.6 Sol Pro?

GLM 5.3 FlashX Legal is 13.6× cheaper than GPT-5.6 Sol Pro on a typical 3:1 input/output mix.

GLM 5.3 FlashX Legal vs GPT-5.6 Sol Pro: which has a bigger context window?

GLM 5.3 FlashX Legal: 1,048,576 tokens. GPT-5.6 Sol 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-5.6 Sol Pro ≈ $18,000.

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