OpenAI · AI model API pricing
How much does GPT-5.6 Terra cost?
The middle GPT-5.6 tier — half of Sol's price, and the default choice for most production OpenAI workloads.
Rate card
| Input tokens | $2.5 / 1M |
| Cached input | $0.25 / 1M |
| Output tokens | $15 / 1M |
| Context window | 1M |
What that means per month
| Workload | Tokens / month | Cost / month |
|---|---|---|
| Prototype | 1M in · 0.3M out | $7/mo |
| Small app | 10M in · 3M out | $70/mo |
| Production app | 50M in · 15M out | $350/mo |
| High volume | 200M in · 60M out | $1,400/mo |
| Heavy platform | 1B in · 300M out | $7,000/mo |
Standard on-demand rates from OpenAI's official pricing page, last checked 2026-07-16. Batch API runs at 50% of these rates. Monthly figures exclude caching and batch discounts. Confirm live pricing before committing.
Cheaper alternatives
At a reference workload of 10M input / 3M output tokens a month, these cost less than GPT-5.6 Terra ($70/mo):
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Gemini 3.1 Pro $56/mo - Gemini 3.5 Flash $42/mo
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Grok 4.5 $38/mo