GLM 5.3 Flash vs Seed 2.1 Turbo

Price, context window & benchmark comparison

Z

GLM 5.3 Flash

Z.ai (Zhipu)
$0.15 / $0.50
Input / Output · per 1M tokens
VS
B

Seed 2.1 Turbo

ByteDance Seed
$0.50 / $2.50
Input / Output · per 1M tokens
Compare different models
Z
B
Verdict: GLM 5.3 Flash is 4.2× cheaper than Seed 2.1 Turbo on a typical 3:1 input/output mix. GLM 5.3 Flash has the larger context window (1.3M vs 262K).
GLM 5.3 FlashSeed 2.1 Turbo
Input price / 1M$0.15$0.50
Output price / 1M$0.50$2.50
Blended price (3:1)$0.24$1.00
Cached input / 1M$0.05
Context window1.3M262K
Max output944K236K
Intelligence index41.8
Coding index71.5
Providers311
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-08-262026-08-12
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FAQ

Which is cheaper, GLM 5.3 Flash or Seed 2.1 Turbo?

GLM 5.3 Flash is 4.2× cheaper than Seed 2.1 Turbo on a typical 3:1 input/output mix.

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

GLM 5.3 Flash: 1,310,720 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 Flash ≈ $550.00, Seed 2.1 Turbo ≈ $2,250.

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