Home › Compare › Z.ai: GLM 5.3 Flash vs Z.ai: GLM 5.3 Prime
Z.ai: GLM 5.3 Flash vs Z.ai: GLM 5.3 Prime: API Pricing Compared
Comparing Z.ai: GLM 5.3 Flash and Z.ai: GLM 5.3 Prime: on combined input+output list price, Z.ai: GLM 5.3 Flash is cheaper at $0.65 vs $11.6 per 1M tokens — a difference of $10.95 (94%). Z.ai: GLM 5.3 Flash costs $0.15 in / $0.5 out with a 1,048,576-token context; Z.ai: GLM 5.3 Prime costs $2.8 in / $8.8 out with a 1,000,000-token context.
| Z.ai: GLM 5.3 Flash | Z.ai: GLM 5.3 Prime | |
|---|---|---|
| Input /1M | $0.15 | $2.8 |
| Output /1M | $0.5 | $8.8 |
| Cached input /1M | $0.03 | $0.56 |
| Context window | 1,048,576 | 1,000,000 |
| Max output tokens | 943,717 | 131,072 |
| Cost @ 10M in + 2M out / mo | $2.5 | $45.6 |
Estimate your own workload in the cost calculator, or open the full pages for Z.ai: GLM 5.3 Flash and Z.ai: GLM 5.3 Prime.
Frequently asked questions
Which is cheaper, Z.ai: GLM 5.3 Flash or Z.ai: GLM 5.3 Prime?
Z.ai: GLM 5.3 Flash is cheaper on combined list price: $0.65 vs $11.6 per 1M tokens (input + output). At 10M input + 2M output tokens per month, Z.ai: GLM 5.3 Flash costs $2.5 and Z.ai: GLM 5.3 Prime costs $45.6.
Which has the larger context window, Z.ai: GLM 5.3 Flash or Z.ai: GLM 5.3 Prime?
Z.ai: GLM 5.3 Flash has a context window of 1,048,576 tokens; Z.ai: GLM 5.3 Prime has 1,000,000 tokens. The larger one is Z.ai: GLM 5.3 Flash.
Price snapshot October 22, 2026, refreshed daily.