GLM 5.3 Prime vs GPT-5.1

Price, context window & benchmark comparison

Z.ai (Zhipu)

GLM 5.3 Prime

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

GPT-5.1

OpenAI
$1.25 / $10.00
Input / Output · per 1M tokens
Compare different models
Z.ai (Zhipu)
OpenAI
Verdict: GPT-5.1 is 20% 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
Input price / 1M$2.80$1.25
Output price / 1M$8.80$10.00
Blended price (3:1)$4.30$3.44
Cached input / 1M$0.56$0.13
Context window1M400K
Max output131K128K
Intelligence index
Coding index49.4
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?

GPT-5.1 is 20% cheaper than GLM 5.3 Prime on a typical 3:1 input/output mix.

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

GLM 5.3 Prime: 1,000,000 tokens. GPT-5.1: 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 ≈ $7,500.

More comparisons