Google Gemini 3.5 Flash vs Z.ai GLM 5.3 Prime
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Gemini 3.5 Flash is 1.3× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
- GLM 5.3 Prime is the newer model (released 2026-09-23).
| Gemini 3.5 Flash | GLM 5.3 Prime | |
|---|---|---|
| Vendor | Z.ai | |
| Released | 2026-05-19 | 2026-09-23 |
| Input / 1M | $1.50 | $2.80 |
| Output / 1M | $9.00 | $8.80 |
| Cached input / 1M | $0.15 | $0.56 |
| Blended / 1M (3:1) | $3.38 | $4.30 |
| Context | 1M | 1M |
| Max output | 66K | 131K |
| Accepts | text, image, file, audio, video | text |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 7 | 1 |
| Cheapest provider, output | $9.00 | $8.80 |
| Best provider uptime, 24 h | 100% | 99.79% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | — |
Cost calculator
Gemini 3.5 Flash
$225 per month$7.50 per day
GLM 5.3 Prime
$300 per month$10.00 per day
Gemini 3.5 Flash saves $75.00 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Gemini 3.5 Flash with