GPT-5.6 API pricing · Updated
GPT-5.6 Sol costs $4.00 per million input tokens and $20.00 per million output tokens on the OpenAI API. GPT-5.6 Terra costs $2.00 and $12.00, and GPT-5.6 Luna $0.20 and $1.20. Batch and Flex halve every price, Fast mode doubles it, and prompts over 272,000 tokens cost more. The GPT-5.6 Sol price is promotional through at least November 21, 2026.
| Model | Input | Cache read | 30-min cache write | Output | Batch in / out | Status |
|---|---|---|---|---|---|---|
GPT-5.6 Solgpt-5.6-solPrompts over 272,000 tokens: $8.00 in / $30.00 out | $4.00 | $0.40 | $5.00 | $20.00 | $2.00 / $10.00 | Current |
GPT-5.6 Terragpt-5.6-terraPrompts over 272,000 tokens: $4.00 in / $18.00 out | $2.00 | $0.20 | $2.50 | $12.00 | $1.00 / $6.00 | Available |
GPT-5.6 Lunagpt-5.6-lunaPrompts over 272,000 tokens: $0.40 in / $1.80 out | $0.20 | $0.02 | $0.25 | $1.20 | $0.10 / $0.60 | Available |
Prices from OpenAI’s pricing page and deprecation schedule, for OpenAI’s own API. Ganivra uses these same rates to price GPT-5.6 calls. Upcoming changes across providers are on the price change and shutdown tracker.
Worked out from the prices above, at standard rates with no Batch discount.
| Request | GPT-5.6 Sol | GPT-5.6 Terra | Per 1,000 on GPT-5.6 Sol |
|---|---|---|---|
| Chat reply3,000 input tokens, 500 output | $0.022 | $0.012 | $22.00 |
| Document summary30,000 input tokens, 1,500 output | $0.150 | $0.078 | $150 |
| Agent task80,000 input tokens (60,000 cached), 6,000 output | $0.224 | $0.124 | $224 |
The same agent task (80,000 input tokens (60,000 cached), 6,000 output) on other models, per 1,000 requests. Quality differs between models, so test on your own prompts before switching.
| Model | Input / output per 1M | Agent task per 1,000 | vs GPT-5.6 Sol |
|---|---|---|---|
| GPT-6 Luna | $0.10 / $0.50 | $5.60 | −98% |
| GPT-6.1 Terra | $1.00 / $5.00 | $53.00 | −76% |
| GPT-6.1 Sol | $2.00 / $10.00 | $106 | −53% |
| Claude Sonnet 5.5 | $2.00 / $10.00 | $106 | −53% |
| Gemini 4 Argon | $2.00 / $10.00 | $106 | −53% |
| Claude Opus 5.5 | $4.00 / $20.00 | $212 | −5% |
| GPT-5.6 Sol | $4.00 / $20.00 | $224 | — |
To see what your own calls would cost on each of these, Ganivra reprices your recorded usage in model comparison.
Head-to-head price comparisons: GPT-6.1 Sol vs GPT-5.6 Sol · all comparisons.
Ganivra prices every GPT-5.6 call at these rates and adds it up by customer, feature and workflow, next to what each customer pays. You see who is profitable on GPT-5.6 and who isn’t.
Per million tokens, GPT-5.6 Sol costs $4.00 input and $20.00 output, GPT-5.6 Terra $2.00 input and $12.00 output and GPT-5.6 Luna $0.20 input and $1.20 output. A chat reply of 3,000 input and 500 output tokens costs $0.022 on Sol, $0.012 on Terra and $0.0012 on Luna.
Yes. OpenAI lists GPT-5.6 Sol at a promotional price through at least November 21, 2026 and has not published the price after that. Ganivra updates its rates when OpenAI does, and calls keep the price in effect on the day they ran.
GPT-5, GPT-5 mini and GPT-5 nano shut down on December 11, 2026, with GPT-5.6 Sol, Terra and Luna as their replacements. For the same chat reply, GPT-5.6 Sol costs 2.5 times GPT-5, GPT-5.6 Terra costs 6.9 times GPT-5 mini and GPT-5.6 Luna costs 3.4 times GPT-5 nano. Check what the switch does to your margins before the shutdown date.
Yes. GPT-6.1 Sol costs $2.00 input and $10.00 output per million tokens, half of GPT-5.6 Sol, and GPT-6.1 Terra costs $1.00 input and $5.00 output, against $2.00 input and $12.00 output for GPT-5.6 Terra.
Once a prompt passes 272,000 input tokens, the whole request is billed at long-context rates: $8.00 input and $30.00 output per million on GPT-5.6 Sol, $4.00 input and $18.00 output on Terra and $0.40 input and $1.80 output on Luna.
On GPT-5.6 Sol, Batch and Flex cost $2.00 input and $10.00 output per million tokens, and Fast mode $8.00 input and $40.00 output. The same 50% and 2× apply to Terra and Luna.
Tag each GPT-5.6 call with the customer it served, then price it at these rates and add it up by customer. Ganivra does this automatically with two lines of the Python SDK, including Batch, Flex and Fast mode calls, and shows each customer's OpenAI cost next to what they pay you.
Looking for another model? See all 165 supported models and prices.