GPT-5.6 Sol API Pricing: Cost Calculator & Real Examples (2026)
GPT-5.6 Sol charges $4.00 per 1 million input tokens and $20.00 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 Sol preselected.
| Meter | Price per 1M tokens |
|---|---|
| Input | $4.00 |
| Cached input | $0.40 |
| Output | $20.00 |
Note: Standard short-context promotional pricing, available at least through 2026-11-21.
What does GPT-5.6 Sol cost in practice?
| Monthly scenario | Token bill |
|---|---|
| Support chatbot (150k requests, 400 in / 300 out tokens) | $1,140.00 |
| Document workflow (22k runs, 3,000 in / 400 out tokens) | $440.00 |
| High-volume classifier (1M requests, 300 in / 10 out tokens) | $1,400.00 |
In the chatbot scenario, output is ~79% of the GPT-5.6 Sol 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 Sol offers cached input at $0.40/1M (vs $4.00 standard). At a 60% cache-hit rate, the example chatbot drops from $1,140.00 to $1,010.40/month — saving $129.60. If your system prompt and context are stable, this discount is free money.
Is GPT-5.6 Sol cheap or expensive?
On the same chatbot workload, GPT-5.6 Sol is cheaper than 2 of the 11 models we track (position 10 of 12, cheapest to priciest). The nearest cheaper alternative is Gemini 3.1 Pro Preview ($660.00/month on the same scenario). One step up: Claude Opus 4.8 ($1,425.00/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 Sol cost per 1M tokens?
$4.00 per 1M input tokens and $20.00 per 1M output tokens (verified 2026-09-17).
What does a chatbot cost on GPT-5.6 Sol?
A 500-active-user chatbot (10 questions/day, 400 input + 300 output tokens per request) costs ~$1,140.00/month in tokens on GPT-5.6 Sol. Adjust the assumptions in the calculator.
Our take on this model
Sol is the upper tier of the GPT-5.6 family. Its standard short-context price is currently promotional through at least November 21, 2026, so forecasts that extend beyond that date should include a price-change scenario.
Sol costs twice Terra's input rate and about 1.7× its output rate. Use it where evaluations show a real quality gain on difficult coding or agent workflows; routine extraction, support and summarization should begin on a lower tier.
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.