Z.ai: GLM 5.3 Flash vs OpenAI: GPT-5.2
z-ai vs openai
On price, Z.ai: GLM 5.3 Flash is cheaper (blended cost is about 0.05× that of OpenAI: GPT-5.2).
On capability, OpenAI: GPT-5.2 has the higher intelligence index (30) — better for complex reasoning.
Verdict: pick Z.ai: GLM 5.3 Flash on a budget, or OpenAI: GPT-5.2 for output quality. Full details below.
Side-by-Side Specs
| Metric | Z.ai: GLM 5.3 Flash | OpenAI: GPT-5.2 |
|---|---|---|
| Input /1M | $0.15 | $1.75 |
| Output /1M | $0.50 | $14.00 |
| Blended (3:1) | $0.24 | $4.81 |
| Context | 1.0M | 400K |
| Intelligence | 28 | 30 |
| Coding | 72 | 49 |
| Math | — | 99 |
| Speed | 56 tok/s | 73 tok/s |
| CPS Grade | A | A |
FAQ
Which is cheaper, Z.ai: GLM 5.3 Flash or OpenAI: GPT-5.2?
On price, Z.ai: GLM 5.3 Flash is cheaper (blended cost is about 0.05× that of OpenAI: GPT-5.2). Z.ai: GLM 5.3 Flash: $0.15 in / $0.5 out; OpenAI: GPT-5.2: $1.75 in / $14 out (per 1M tokens).
Which is smarter, Z.ai: GLM 5.3 Flash or OpenAI: GPT-5.2?
On capability, OpenAI: GPT-5.2 has the higher intelligence index (30) — better for complex reasoning. Coding index: Z.ai: GLM 5.3 Flash 72 vs OpenAI: GPT-5.2 49.
Which one should I choose?
Verdict: pick Z.ai: GLM 5.3 Flash on a budget, or OpenAI: GPT-5.2 for output quality. Full details below.