GPT-5.6 Terra pricing: API and ChatGPT plans
GPT-5.6 Terra costs $2 per million input tokens and $12 per million output, with a 1.05M context window. In ChatGPT, it comes with the free plan, and the cheapest paid plan with it is Go at $8/mo.
AIGROW credit covers Claude Opus 5.5, Claude Fable 5.2, Claude Fable 5.1, GPT-6 Astra, Claude Sonnet 5.5, GPT-6.1 Sol, GPT-6.1 Terra, Grok 4.7 and Gemini 4 Argon. GPT-6.1 Sol below list price
$25 a month brings $110 of API credit and cancels any time; $25 once buys $100. US dollars per million tokens, standard rate, shortest context band. Plan prices read 14 October 2026. Number 17 of 256 on the Epoch Capabilities Index by Epoch AI, data of 12 November 2026. CC BY 4.0 Newer model: GPT-6.1 Terra
- 1,000 support replies
- $10.80
- Cached input
- $0.20
- Context window
- 1,050,000 tokens
- Released
- 9 Jul 2026
- Weights
- Closed weights
From OpenAI’s own pages, 12 November 2026.
GPT-5.6 Terra costs $2 per million input tokens and $12 per million output tokens on OpenAI’s own API, and $0.20 for cached input. At those prices 1,000 support replies cost $10.80, the 12th most expensive of 49 priced models on our list.
In ChatGPT: GPT-5.6 Terra is included in Free ($0/mo), Go ($8/mo), Plus ($20/mo), Pro (from $100/mo), Business ($25/mo), Business Premium ($125/mo).
chatgpt.com/pricing/ · Read 14 October 2026. Prices can differ by country and include or exclude tax depending on the country.
AIGROW API credit per million input / output tokens: Claude Opus 5.5 $1.60 / $8.00, Claude Fable 5.2 $3.20 / $16.00, Claude Fable 5.1 $4.00 / $20.00, GPT-6 Astra $2.50 / $12.50, Claude Sonnet 5.5 $0.80 / $4.00, GPT-6.1 Sol $0.50 / $2.50, GPT-6.1 Terra $0.25 / $1.25, Grok 4.7 $0.50 / $1.50 and Gemini 4 Argon $1.00 / $5.00. That is up to 75% below list price. See API credit
What a job costs
Three jobs, 1,000 runs of each, at the list price above, and where each puts GPT-5.6 Terra among the 49 models with a list price.
| Job | 1,000 runs | Among 49 |
|---|---|---|
| Support reply3,000 in, 400 out. | $10.80 | 12th most expensive |
| Document summary25,000 in, 1,000 out. | $62.00 | 12th most expensive |
| Agent task80,000 in (70,000 cached), 3,000 out. | $70.00 | 14th most expensive |
The token counts are ours, chosen to look like real work; the prices are OpenAI’s. All three jobs stay under 100,000 tokens a request, below every long-context surcharge on the list.
GPT-5.6 Terra on real small-business tasks
What the AIGROW benchmark measured when GPT-5.6 Terra was given 20 office tasks, each marked pass or fail by fixed checks.
- Success rate
- 80% of 20 runs passed (95% interval 58 to 92%), 18th of 36 models.
- Cost per 1,000 passes
- $6.68, failed runs included, worked from list price.
- Answer time
- 29 s median, 36 s at the 90th percentile.
- Strongest and weakest
- Appointment scheduling (100% passed) and review replies (0%).
The small print
What the base rate above leaves out, copied from the maker’s pages: surcharges, discounts, promotions and cache pricing.
OpenAI calls it the mini tier of the 5.6 family; tiered mid here on price. Price cut 20% on 2026-07-30. Requests above 272K input tokens bill 2x input and 1.5x output ($4 / $18). Cache write $2.50. Batch and Flex 50% off. Data residency adds 10%.
GPT-5.6 Terra against the models it is weighed with
Each comparison puts both list prices side by side and costs the same three jobs on each.
- vs Claude Sonnet 5
- Anthropic's and OpenAI's previous mid-tier models at nearly the same list price; both makers have since released a newer one.
- vs Gemini 3.8 Flash
- OpenAI's GPT-5.6 mid tier against Google's workhorse, a common shortlist for high-volume business tasks.
- vs GPT-5.6 Sol
- The step from the mid tier to the flagship within OpenAI's GPT-5.6 family.
- vs Kimi K2.6
- Kimi's cheaper previous flagship against OpenAI's GPT-5.6 mid tier at under half the price.
- vs GPT-6.1 Terra
- OpenAI's new Terra against the GPT-5.6 Terra it replaces, at half the input price and under half the output price.
Other OpenAI models
| Model | Input | Output | Context | 1,000 replies |
|---|---|---|---|---|
| GPT-6 LunaOpenAI | $0.10 | $0.50 | 1.05M | $0.50 |
| GPT-5.6 LunaOpenAINewer model: GPT-6 Luna | $0.20 | $1.20 | 1.05M | $1.08 |
| GPT-5.4 nanoOpenAINewer model: GPT-6 Luna | $0.20 | $1.25 | 400K | $1.10 |
| GPT-5.4 miniOpenAINewer model: GPT-6.1 Terra | $0.75 | $4.50 | 400K | $4.05 |
| GPT-6.1 TerraOpenAI | $1.00 | $5.00 | 1.05M | $5.00 |
| GPT-6.1 SolOpenAI | $2.00 | $10.00 | 1.05M | $10.00 |
| GPT-6 SolOpenAINewer model: GPT-6.1 Sol | $2.00 | $10.00 | 1.05M | $10.00 |
| GPT-5.6 SolOpenAINewer model: GPT-6.1 Sol | $4.00 | $20.00 | 1.05M | $20.00 |
| GPT-5.5OpenAINewer model: GPT-6 Astra | $5.00 | $30.00 | 1.05M | $27.00 |
| GPT-6 AstraOpenAI | $10.00 | $50.00 | 1.05M | $50.00 |
Where the price comes from
Read on 12 November 2026. Each price is the standard rate for the shortest context band, with no batch or priority discount; long-context surcharges, batch rates and promotions are in each model’s small print. No price was taken from a reseller.
Compare GPT-5.6 Terra with 53 other models
The price list sets every model’s input and output price side by side, with what a support reply, a document summary and an agent task cost on each.
Prices checked 12 November 2026 · See them by release date