GPT-5.6 Sol API pricing
OpenAI's heaviest 5.6 tier — deepest reasoning, widest tool use. Available at about 27% below official list.
| Route | Input / 1M | Output / 1M |
|---|---|---|
| Official list price | $4 | $20 |
| Discounted route | $2.5 | $15 |
USD, standard tier, verified 2026-09-16.
Specifications
| Vendor | OpenAI |
| Context window | 1.05M |
| Max output | 128K |
| Category | US frontier |
What GPT-5.6 Sol costs at your volume
| Usage level | Input / output per month | Monthly cost |
|---|---|---|
| Light — prototyping, a few thousand calls | 5M / 1M | $27.50 |
| Working — one developer, daily use | 50M / 10M | $275.00 |
| Heavy — team or agent loops in production | 500M / 100M | $2,750.00 |
Calculated at $2.5 input / $15 output per 1M tokens, assuming a 5:1 input-to-output ratio. Your ratio decides the real number — run your own figures through the cost calculator.
When GPT-5.6 Sol is the right call
At $2.5 per million input tokens this sits in the premium band. It is a good fit for work where a wrong answer costs more than the tokens do — hard debugging, large refactors, ambiguous requirements, anything you would otherwise redo by hand.
It is usually the wrong call for high-volume mechanical work like classification, extraction, formatting or bulk rewrites, where a cheaper model gives you the same result for a fraction of the cost.
Similarly priced alternatives
| Similarly priced | Vendor | In / out per 1M | vs this |
|---|---|---|---|
| Claude Opus 5 | Anthropic | $2.5 / $12.5 | −$2.50 |
| Kimi K3 | Moonshot | $1.5 / $7.5 | −$8.50 |
| GPT-5.6 Terra | OpenAI | $1 / $6 | −$10.50 |
Blended comparison (input + output per 1M). Price is one axis — the models above are not interchangeable, they are the ones worth testing side by side at this budget.
Setting it up
Pointing an existing integration at this model is a base URL change, not a rewrite. Pick your tool:
- Claude Code — set the base URL via environment variables
- Cursor — override the API endpoint in settings
- OpenAI / Anthropic SDK — one
base_urlargument - Python — sync, streaming and async examples
- Cutting the bill — eight levers ranked by effect
FAQ
How much does GPT-5.6 Sol cost per million tokens?
$2.5 per million input tokens and $15 per million output tokens. Anthropic/OpenAI list the same model at $4 / $20
Is GPT-5.6 Sol cheaper than buying direct?
Yes — currently 38% lower on input and 25% lower on output than the published list price. Rates move with upstream promotions, so check the live number before budgeting.
What does GPT-5.6 Sol cost per month in practice?
At a 5:1 input-to-output ratio it is about $27.50 a month for light use (5M input tokens) and roughly $2,750.00 for heavy use (500M input). Agent workloads sit at the high end because every turn resends the context — see what actually drives Claude Code cost.
Which models cost about the same as GPT-5.6 Sol?
The comparison table further up this page lists the three closest in blended price. If you are choosing on cost alone, start there and test the top two on your own prompts — price per token is only half the equation, the other half is how many tokens a model needs to finish the task.
How do I start using GPT-5.6 Sol?
You need an API key, then point your client at the gateway base URL. It is a one-line change in most SDKs — see the SDK setup guide, or the Claude Code and Cursor guides for those tools.