GLM-4.6 vs GPT-5.6 Terra
Both are Mid-tier models, from Z.ai and OpenAI respectively. GLM-4.6 is the cheaper choice overall at a 4:1 input:output ratio.
Which is cheaper
Side by side
| Spec | GLM-4.6 | GPT-5.6 Terra |
|---|---|---|
| Provider | Z.ai | OpenAI |
| Tier | Mid | Mid |
| Context window | 200K | 1.05M |
| Max output | 128K | 128K |
| Input $/1M | $0.60 | $2.00 |
| Output $/1M | $2.20 | $12.00 |
| Cache read $/1M | $0.11 | $0.20 |
| Cache write $/1M | — | $2.50 |
| Modalities | text | text, image |
GLM-4.6. Widely-used popular GLM generation, per 1M tokens.
GPT-5.6 Terra. One flat rate: unlike Sol and Cyber, Terra has no long-context surcharge tier on the pricing page.
Sources
GLM-4.6 — verified August 29, 2026
GPT-5.6 Terra — verified August 29, 2026
Full GLM-4.6 pricing page → · Full GPT-5.6 Terra pricing page →