OpenAI o3 Mini High vs Z.ai GLM 5.1
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
- o3 Mini High is 1.1× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 200K tokens.
- GLM 5.1 output costs $2.82 per 1M via Baidu, against the list price of $4.40.
- GLM 5.1's best provider was more reliable over 24 h: 100% vs 0.0%.
- GLM 5.1 is the newer model (released 2026-04-07).
| o3 Mini High | GLM 5.1 | |
|---|---|---|
| Vendor | OpenAI | Z.ai |
| Released | 2025-02-12 | 2026-04-07 |
| Input / 1M | $1.10 | $1.40 |
| Output / 1M | $4.40 | $4.40 |
| Cached input / 1M | $0.55 | $0.26 |
| Blended / 1M (3:1) | $1.93 | $2.15 |
| Context | 200K | 205K |
| Max output | 100K | 131K |
| Accepts | text, file | text |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 1 | 13 |
| Cheapest provider, output | $4.40 | $2.82 |
| Best provider uptime, 24 h | 0.0% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | — |
Cost calculator
o3 Mini High
$132 per month$4.40 per day
GLM 5.1
$150 per month$5.00 per day
o3 Mini High saves $18.00 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare o3 Mini High with