Google Gemini 3.8 Flash vs Z.ai GLM 5.3 FlashX
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
- GLM 5.3 FlashX is 2.8× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
| Gemini 3.8 Flash | GLM 5.3 FlashX | |
|---|---|---|
| Vendor | Z.ai | |
| Released | 2026-09-02 | 2026-09-18 |
| Input / 1M | $0.825 | $0.37 |
| Output / 1M | $4.13 | $1.25 |
| Cached input / 1M | $0.083 | $0.09 |
| Blended / 1M (3:1) | $1.65 | $0.59 |
| Context | 1M | 1M |
| Max output | 66K | 131K |
| Accepts | text, image, file, audio, video | text, image, video |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 7 | 1 |
| Cheapest provider, output | $3.75 | $1.25 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | — |
Cost calculator
Gemini 3.8 Flash
$111 per month$3.71 per day
GLM 5.3 FlashX
$40.95 per month$1.36 per day
GLM 5.3 FlashX saves $70.43 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Gemini 3.8 Flash with
Compare GLM 5.3 FlashX with