GLM 5.3 Prime vs GPT-5.1-Codex-Mini

Price, context window & benchmark comparison

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GLM 5.3 Prime

Z.ai (Zhipu)
$2.80 / $8.80
Input / Output · per 1M tokens
VS
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GPT-5.1-Codex-Mini

OpenAI
$0.25 / $2.00
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.1-Codex-Mini is 6.3× 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 400K).
GLM 5.3 PrimeGPT-5.1-Codex-Mini
Input price / 1M$2.80$0.25
Output price / 1M$8.80$2.00
Blended price (3:1)$4.30$0.69
Cached input / 1M$0.56$0.03
Context window1M400K
Max output131K128K
Intelligence index——
Coding index——
Providers1—
Best provider uptime (30m)100.0%—
Vision inputNoYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-232025-11-13
Retirement——

Cost calculator

FAQ

Which is cheaper, GLM 5.3 Prime or GPT-5.1-Codex-Mini?

GPT-5.1-Codex-Mini is 6.3× cheaper than GLM 5.3 Prime on a typical 3:1 input/output mix.

GLM 5.3 Prime vs GPT-5.1-Codex-Mini: which has a bigger context window?

GLM 5.3 Prime: 1,000,000 tokens. GPT-5.1-Codex-Mini: 400,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GLM 5.3 Prime ≈ $10,000, GPT-5.1-Codex-Mini ≈ $1,500.

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