GPT-5.6 Terra vs Mistral Medium 3.5
Both are Mid-tier models, from OpenAI and Mistral AI respectively. Mistral Medium 3.5 is the cheaper choice overall at a 4:1 input:output ratio.
Which is cheaper
- Input price: Mistral Medium 3.5 is cheaper ($1.50 vs $2.00).
- Output price: Mistral Medium 3.5 is cheaper ($7.50 vs $12.00).
- Blended, 4:1 input:output ratio: Mistral Medium 3.5 is 32.5% cheaper ($2.70 vs $4.00 per weighted 1M tokens).
Side by side
| Spec | GPT-5.6 Terra | Mistral Medium 3.5 |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Tier | Mid | Mid |
| Context window | 1.05M | 256K |
| Max output | 128K | — |
| Input $/1M | $2.00 | $1.50 |
| Output $/1M | $12.00 | $7.50 |
| Cache read $/1M | $0.20 | — |
| Cache write $/1M | $2.50 | — |
| Modalities | text, image | text |
GPT-5.6 Terra. One flat rate: unlike Sol and Cyber, Terra has no long-context surcharge tier on the pricing page.
Sources
GPT-5.6 Terra — verified August 29, 2026
Mistral Medium 3.5 — verified August 29, 2026
Full GPT-5.6 Terra pricing page → · Full Mistral Medium 3.5 pricing page →