GPT-5.6 Terra API Pricing: Cost Calculator & Real Examples (2026)
GPT-5.6 Terra charges $2.00 per 1 million input tokens and $12.00 per 1 million output tokens. But per-token prices don't answer the real question: what will your workload cost per month? Below we compute it for three realistic scenarios — or run your own numbers with GPT-5.6 Terra preselected.
| Meter | Price per 1M tokens |
|---|---|
| Input | $2.00 |
| Cached input | $0.20 |
| Output | $12.00 |
Note: Standard short-context pricing. Long-context and Fast mode requests use different rates.
What does GPT-5.6 Terra cost in practice?
| Monthly scenario | Token bill |
|---|---|
| Support chatbot (150k requests, 400 in / 300 out tokens) | $660.00 |
| Document workflow (22k runs, 3,000 in / 400 out tokens) | $237.60 |
| High-volume classifier (1M requests, 300 in / 10 out tokens) | $720.00 |
In the chatbot scenario, output is ~82% of the GPT-5.6 Terra bill — capping response length (max tokens) is the most direct optimization. Document workflows are input-heavy, so the input rate dominates there.
Prompt caching savings
GPT-5.6 Terra offers cached input at $0.20/1M (vs $2.00 standard). At a 60% cache-hit rate, the example chatbot drops from $660.00 to $595.20/month — saving $64.80. If your system prompt and context are stable, this discount is free money.
Is GPT-5.6 Terra cheap or expensive?
On the same chatbot workload, GPT-5.6 Terra is cheaper than 4 of the 11 models we track (position 8 of 12, cheapest to priciest). The nearest cheaper alternative is Claude Sonnet 5 ($570.00/month on the same scenario). One step up: Gemini 3.1 Pro Preview ($660.00/month). The right decision isn't absolute price but the cheapest model that meets your quality bar — test before overpaying.
FAQ
How much does GPT-5.6 Terra cost per 1M tokens?
$2.00 per 1M input tokens and $12.00 per 1M output tokens (verified 2026-09-17).
What does a chatbot cost on GPT-5.6 Terra?
A 500-active-user chatbot (10 questions/day, 400 input + 300 output tokens per request) costs ~$660.00/month in tokens on GPT-5.6 Terra. Adjust the assumptions in the calculator.
Our take on this model
Terra is the balanced tier of the GPT-5.6 family and a practical first benchmark for general chat, drafting, coding assistance and summarization. Its standard price sits between Sol and Luna without relying on a legacy model comparison.
Terra's role is a measured default: move difficult requests up to Sol or Astra and repetitive, verifiable work down to Luna. That routing decision matters because Luna is 10× cheaper per uncached input and output token.
Prices verified on 2026-09-17 against the provider's official pricing page. Estimates are for planning purposes only — always confirm current pricing with the provider.