GPT-6.1 Terra API pricing
GPT-6.1 Terra costs $1 per million input tokens and $5 per million output tokens on OpenAI's API. Input read back from the prompt cache costs $0.05 per million. A typical support chat reply (1,500 tokens in, 300 out) costs about $0.0030.
| Input | $1 per 1M tokens |
|---|---|
| Output | $5 per 1M tokens |
| Cached input | $0.05 per 1M tokens |
| Cache writes | $1.25 per 1M tokens |
| Long prompts | $2 in, $7.50 out per 1M tokens above the prompt size OpenAI sets for this model |
| Context window | 1.05M tokens |
| Reads | files, images, text |
| Released | October 26, 2026 |
What requests cost on GPT-6.1 Terra
The same four requests on every page, so you can compare models directly.
| Request | Tokens in / out | Per request | Per 10,000 requests |
|---|---|---|---|
| A support chat reply | 1,500 / 300 | $0.0030 | $30.00 |
| Summarizing a 10-page document | 6,000 / 500 | $0.0085 | $85.00 |
| Sorting a support ticket into a category | 400 / 5 | $0.00042 | $4.25 |
| A question about a 120-page document | 60,000 / 800 | $0.064 | $640 |
OpenAI's cheapest model here, GPT-5 nano, costs 94% less for the same chat reply. Whether it is good enough depends on the request: simple ones (sorting, short summaries, extraction) often are, hard reasoning often isn't.
On Azure: for the OpenAI models Microsoft lists, Azure OpenAI's Global Standard deployments charge the same per-token price as OpenAI's own API, and Data Zone costs 10% more. Azure OpenAI pricing compares the two, with Flex, PTU and monthly cost examples.
Other OpenAI models
| Model | Input | Output | A chat reply | Next to GPT-6.1 Terra |
|---|---|---|---|---|
| GPT-5 nano | $0.05 | $0.40 | $0.00019 | 94% less |
| GPT-4.1 nano | $0.10 | $0.40 | $0.00027 | 91% less |
| GPT-6 Luna | $0.10 | $0.50 | $0.00030 | 90% less |
| GPT-4o mini | $0.15 | $0.60 | $0.00040 | 87% less |
| GPT-5.6 Luna | $0.20 | $1.20 | $0.00066 | 78% less |
| GPT-5.4 nano | $0.20 | $1.25 | $0.00068 | 78% less |
| GPT-5 mini | $0.25 | $2 | $0.00097 | 68% less |
| GPT-4.1 mini | $0.40 | $1.60 | $0.0011 | 64% less |
| GPT-5.4 mini | $0.75 | $4.50 | $0.0025 | 17% less |
| o4-mini | $1.10 | $4.40 | $0.0030 | 1% less |
| o3-mini | $1.10 | $4.40 | $0.0030 | 1% less |
| GPT-5.1 | $1.25 | $10 | $0.0049 | 63% more |
| GPT-5 | $1.25 | $10 | $0.0049 | 63% more |
| GPT-4.1 | $2 | $8 | $0.0054 | 80% more |
| o3 | $2 | $8 | $0.0054 | 80% more |
| GPT-6.1 Sol | $2 | $10 | $0.0060 | 2.0x the price |
| GPT-6 Sol | $2 | $10 | $0.0060 | 2.0x the price |
| GPT-5.6 Terra | $2 | $12 | $0.0066 | 2.2x the price |
| GPT-4o | $2.50 | $10 | $0.0067 | 2.3x the price |
| GPT-5.2 | $1.75 | $14 | $0.0068 | 2.3x the price |
| GPT-5.4 | $2.50 | $15 | $0.0083 | 2.8x the price |
| GPT-5.6 Sol | $4 | $20 | $0.012 | 4.0x the price |
| GPT-5.5 | $5 | $30 | $0.017 | 5.5x the price |
| GPT-6 Astra | $10 | $50 | $0.03 | 10x the price |
| o1 | $15 | $60 | $0.041 | 14x the price |
| o3-pro | $20 | $80 | $0.054 | 18x the price |
| GPT-5 Pro | $15 | $120 | $0.059 | 20x the price |
| GPT-5.2 Pro | $21 | $168 | $0.082 | 27x the price |
| GPT-5.5 Pro | $30 | $180 | $0.099 | 33x the price |
| GPT-5.4 Pro | $30 | $180 | $0.099 | 33x the price |
| o1-pro | $150 | $600 | $0.405 | 135x the price |
Similar price from other companies
| Model | Input | Output | A chat reply | Next to GPT-6.1 Terra |
|---|---|---|---|---|
| Claude Haiku 4.5 | $1 | $5 | $0.0030 | same price |
| Grok 4.3 | $1.25 | $2.50 | $0.0026 | 13% less |
| Gemini 3.8 Flash | $0.75 | $3.75 | $0.0022 | 25% less |
| Gemini 3.6 Flash | $0.75 | $3.75 | $0.0022 | 25% less |
| Grok Build 0.1 | $1 | $2 | $0.0021 | 30% less |
GPT-6.1 Terra pricing questions
How much does the GPT-6.1 Terra API cost per million tokens?
GPT-6.1 Terra costs $1 per million input tokens and $5 per million output tokens on OpenAI's API, and input read back from the prompt cache costs $0.05 per million.
How much do 1,000 tokens cost on GPT-6.1 Terra?
1,000 input tokens cost $0.001 and 1,000 output tokens cost $0.005, at $1 and $5 per million.
What does one request cost on GPT-6.1 Terra?
A typical support chat reply, 1,500 tokens in and 300 out, costs about $0.0030: 1,500 × $1 / 1,000,000 plus 300 × $5 / 1,000,000.
Is there a cheaper OpenAI model than GPT-6.1 Terra?
Yes. GPT-5 nano costs $0.05 per million input tokens and $0.40 per million output tokens, so the same chat reply costs about $0.00019. Whether it answers as well depends on the request: test it on your own prompts.
Paying GPT-6.1 Terra prices for every request?
Most apps send simple requests to the same strong model as the hard ones. PromptUnit checks each request your app sends and uses a cheaper model only when it is just as good for that request. You pay 20% of what it saves, and nothing if it saves nothing.
Checked October 26, 2026. Prices are read every day from OpenAI's pricing page. Context window, inputs and release date come from OpenRouter's public model list.
These are the standard list prices on each provider's own API. Batch, flex and priority tiers, cloud platforms such as Amazon Bedrock or Google Vertex AI, and regional endpoints are priced differently. Request costs above count input and output tokens only, not cache, search or image fees.