GLM 5.3 FlashX Legal vs Seed 2.1 Turbo

Price, context window & benchmark comparison

GLM 5.3 FlashX Legal

Z.ai (Zhipu)

$0.37 / $1.25

Input / Output · per 1M tokens

Seed 2.1 Turbo

ByteDance Seed

$0.50 / $2.50

Input / Output · per 1M tokens

Compare different models

Verdict: GLM 5.3 FlashX Legal is 41% cheaper than Seed 2.1 Turbo on a typical 3:1 input/output mix. GLM 5.3 FlashX Legal has the larger context window (1M vs 262K).

	GLM 5.3 FlashX Legal	Seed 2.1 Turbo
Input price / 1M	$0.37	$0.50
Output price / 1M	$1.25	$2.50
Blended price (3:1)	$0.59	$1.00
Cached input / 1M	$0.075	—
Context window	1M	262K
Max output	131K	236K
Intelligence index	—	—
Coding index	—	—
Providers	1	1
Best provider uptime (30m)	100.0%	100.0%
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-11-02	2026-08-12
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, GLM 5.3 FlashX Legal or Seed 2.1 Turbo?

GLM 5.3 FlashX Legal is 41% cheaper than Seed 2.1 Turbo on a typical 3:1 input/output mix.

GLM 5.3 FlashX Legal vs Seed 2.1 Turbo: which has a bigger context window?

GLM 5.3 FlashX Legal: 1,048,576 tokens. Seed 2.1 Turbo: 262,144 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GLM 5.3 FlashX Legal ≈ $1,365, Seed 2.1 Turbo ≈ $2,250.

More comparisons