GPT-5.6 Terra vs Gemini 3.1 Pro Preview API pricing
They have the same standard per-token price, so the bill is identical for any workload; check the fine print for long-context or other differences. Prices last checked 2026-10-15.
| GPT-5.6 Terra (OpenAI) | Gemini 3.1 Pro Preview (Google) | |
|---|---|---|
| Input $/1M tokens | $2.0 | $2.0 |
| Output $/1M tokens | $12.0 | $12.0 |
| Context | — | — |
| Our tier (1–4) | 3 | 3 |
Example monthly bills
| Workload | GPT-5.6 Terra | Gemini 3.1 Pro Preview | Cheaper |
|---|---|---|---|
| Chat / Q&A 10M in / 2M out per month | $44.00 | $44.00 | Same cost |
| Coding 20M in / 5M out per month | $100.00 | $100.00 | Same cost |
| Output-heavy (reasoning, long answers) 10M in / 10M out per month | $140.00 | $140.00 | Same cost |
Fine print
- GPT-5.6 Terra: ≤272K input; long context $4/$18
- Gemini 3.1 Pro Preview: ≤200K prompt; >200K $4/$18; preview
Cost only, not quality. “Tier” is our rough capability judgment, not a benchmark, and different tokenizers count the same text differently. Reasoning models may bill extra thinking tokens as output. Official sources: OpenAI, Google.
See all models on the full price table, the OpenAI and Google pricing pages, or try the savings calculator with your own numbers.