GPT-5.6 Terra vs GPT-6.1 Sol API pricing
GPT-6.1 Sol is cheaper on every example workload below. Prices last checked 2026-10-15.
| GPT-5.6 Terra (OpenAI) | GPT-6.1 Sol (OpenAI) | |
|---|---|---|
| Input $/1M tokens | $2.0 | $2.0 |
| Output $/1M tokens | $12.0 | $10.0 |
| Context | — | — |
| Our tier (1–4) | 3 | 3 |
Example monthly bills
| Workload | GPT-5.6 Terra | GPT-6.1 Sol | Cheaper |
|---|---|---|---|
| Chat / Q&A 10M in / 2M out per month | $44.00 | $40.00 | GPT-6.1 Sol saves $4.00/mo (9%) |
| Coding 20M in / 5M out per month | $100.00 | $90.00 | GPT-6.1 Sol saves $10.00/mo (10%) |
| Output-heavy (reasoning, long answers) 10M in / 10M out per month | $140.00 | $120.00 | GPT-6.1 Sol saves $20.00/mo (14%) |
Fine print
- GPT-5.6 Terra: ≤272K input; long context $4/$18
- GPT-6.1 Sol: ≤272K input; long context $4/$15
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, OpenAI.
See all models on the full price table, the OpenAI and OpenAI pricing pages, or try the savings calculator with your own numbers.