GLM 5.2 vs DeepSeek V4.1 Flash Fast: cost comparison
Prices updated 2026-10-30 · computed from live provider data
Short answer: DeepSeek V4.1 Flash Fast is cheaper on a
3:1 input/output blend — $0.307 per million tokens versus
$1.75, a 82% difference.
Both offer the same 1,048,576-token context window, so cost is the deciding factor.
Head to head
| GLM 5.2 | DeepSeek V4.1 Flash Fast | |
|---|---|---|
| Input, per 1M tokens | $0.0060 | $0.010 |
| Output, per 1M tokens | $7.00 | $1.20 |
| Blended 3:1, per 1M | $1.75 | $0.307 |
| Context window | 1,048,576 | 1,048,576 |
| Vendor | z-ai | coralbricks |
Monthly cost at real volumes
| Workload (input / output) | GLM 5.2 | DeepSeek V4.1 Flash Fast |
|---|---|---|
| 1M in / 250K out | $1.76 | $0.310 |
| 10M in / 2.5M out | $17.56 | $3.10 |
| 100M in / 25M out | $176 | $31.00 |
Which should you pick?
Because the context windows are identical, the cheaper option is the better default. Choose DeepSeek V4.1 Flash Fast unless you are already standardised on z-ai tooling and want to avoid a second integration.