GLM 5.3 Prime vs Step 3.5 Flash

Price, context window & benchmark comparison

Z

GLM 5.3 Prime

Z.ai (Zhipu)
$2.80 / $8.80
Input / Output · per 1M tokens
VS
S

Step 3.5 Flash

StepFun
$0.10 / $0.30
Input / Output · per 1M tokens
Compare different models
Z
S
Verdict: Step 3.5 Flash is 28.7× cheaper than GLM 5.3 Prime on a typical 3:1 input/output mix. GLM 5.3 Prime has the larger context window (1M vs 262K).
GLM 5.3 PrimeStep 3.5 Flash
Input price / 1M$2.80$0.10
Output price / 1M$8.80$0.30
Blended price (3:1)$4.30$0.15
Cached input / 1M$0.56
Context window1M262K
Max output131K66K
Intelligence index
Coding index
Providers1
Best provider uptime (30m)100.0%
Vision inputNoNo
ReasoningYesYes
Tool callingYesYes
Released2026-09-232026-01-29
Retirement

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FAQ

Which is cheaper, GLM 5.3 Prime or Step 3.5 Flash?

Step 3.5 Flash is 28.7× cheaper than GLM 5.3 Prime on a typical 3:1 input/output mix.

GLM 5.3 Prime vs Step 3.5 Flash: which has a bigger context window?

GLM 5.3 Prime: 1,000,000 tokens. Step 3.5 Flash: 262,144 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GLM 5.3 Prime ≈ $10,000, Step 3.5 Flash ≈ $350.00.

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