Gemini 3.1 Pro vs GLM-5.3
Both are Flagship-tier models, from Google and Z.ai respectively. GLM-5.3 is the cheaper choice overall at a 4:1 input:output ratio.
Which is cheaper
Side by side
| Spec | Gemini 3.1 Pro | GLM-5.3 |
|---|---|---|
| Provider | Z.ai | |
| Tier | Flagship | Flagship |
| Context window | 1M | 1M |
| Max output | 66K | 128K |
| Input $/1M | $2.00 | $1.40 |
| Output $/1M | $12.00 | $4.40 |
| Cache read $/1M | $0.20 | $0.26 |
| Modalities | text, image | text |
Gemini 3.1 Pro. Listed as gemini-3.1-pro-preview. Standard tier for prompts up to 200K tokens; above that, $4 input / $18 output and $0.40 cache read per 1M. Cached context is also billed for storage at $4.50 per 1M tokens per hour.
GLM-5.3. Latest flagship text model, per 1M tokens. Context window not stated on pricing page.
Sources
Gemini 3.1 Pro — verified August 29, 2026
GLM-5.3 — verified August 29, 2026
Full Gemini 3.1 Pro pricing page → · Full GLM-5.3 pricing page →