GLM 5.3 Flashx Legal vs Gemini 3.8 Flash: cost comparison
Prices updated 2026-11-02 · computed from live provider data
Short answer: GLM 5.3 Flashx Legal is cheaper on a
3:1 input/output blend — $0.590 per million tokens versus
$0.750, a 21% difference.
Both offer the same 1,048,576-token context window, so cost is the deciding factor.
Head to head
| GLM 5.3 Flashx Legal | Gemini 3.8 Flash | |
|---|---|---|
| Input, per 1M tokens | $0.370 | $0.375 |
| Output, per 1M tokens | $1.25 | $1.88 |
| Blended 3:1, per 1M | $0.590 | $0.750 |
| Context window | 1,048,576 | 1,048,576 |
| Vendor | z-ai |
Monthly cost at real volumes
| Workload (input / output) | GLM 5.3 Flashx Legal | Gemini 3.8 Flash |
|---|---|---|
| 1M in / 250K out | $0.682 | $0.844 |
| 10M in / 2.5M out | $6.83 | $8.44 |
| 100M in / 25M out | $68.25 | $84.38 |
Which should you pick?
Because the context windows are identical, the cheaper option is the better default. Choose GLM 5.3 Flashx Legal unless you are already standardised on google tooling and want to avoid a second integration.