OpenAI GPT-6.1 Terra 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
- GPT-6.1 Terra is 2.1× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
- GPT-6.1 Terra is the newer model (released 2026-10-26).
| GPT-6.1 Terra | GLM 5.3 Prime | |
|---|---|---|
| Vendor | OpenAI | Z.ai |
| Released | 2026-10-26 | 2026-09-23 |
| Input / 1M | $1.00 | $2.80 |
| Output / 1M | $5.00 | $8.80 |
| Cached input / 1M | $0.05 | $0.56 |
| Blended / 1M (3:1) | $2.00 | $4.30 |
| Context | 1M | 1M |
| Max output | 128K | 131K |
| Accepts | text, image, file | text |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 4 | 1 |
| Cheapest provider, output | $5.00 | $8.80 |
| Best provider uptime, 24 h | 100% | 99.65% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | — |
Cost calculator
GPT-6.1 Terra
$135 per month$4.50 per day
GLM 5.3 Prime
$300 per month$10.00 per day
GPT-6.1 Terra saves $165 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare GPT-6.1 Terra with