o3-pro API pricing
o3-pro is an earlier OpenAI model, still sold. It costs $20 per million tokens it reads and $80 per million it writes, $35 on a mix of 3 read for each 1 written. OpenAI's newest models are GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna. Below are every price OpenAI lists for it, and what 8 everyday jobs cost a month on it.
- Input
- $20 per million tokens read
- Output
- $80 per million tokens written
- On everyday work
- $35 per million, 3 read for each 1 written
- Context window
- 200K tokens at once
- Capability score
- 147 on the Epoch Capabilities Index, GPT-5 is 150
Every o3-pro price, per million tokens
In US dollars, as OpenAI prints them on its price page.
| InputTokens the model reads | $20 |
|---|---|
| Cached inputRead again from the cache | Not listed |
| Cache writePutting text in the cache | Not listed |
| OutputTokens it writes, thinking included | $80 |
| Blend 3:13 tokens read for each 1 written | $35 |
| Batch inputAnswers collected later | $10 |
| Batch output | $40 |
| Context windowTokens it holds at once | 200K tokens |
| Longest answerTokens it writes in 1 reply | 100K tokens |
What 8 everyday jobs cost a month on o3-pro
Each job at its usual number of runs a day, for 30 days, at the standard price. Open any job in the cost calculator to change its size, or to set it beside every other model.
| Job | A run | A month |
|---|---|---|
| A chat question300 in, 500 out, 100 a day | 4.6 cents | $138 |
| A hard question, with thinking300 in, 1,400 out, 100 a day | 12 cents | $354 |
| A long report, summarised60,000 in, 2,000 out, 20 a day | $1.36 | $816 |
| A 40-turn agent task2,800,000 in, 40,000 out, 10 a day | $59.20 | $17,760 |
| A support bot's reply4,000 in, 300 out, 2,000 a day | 10 cents | $6,240 |
| Sort a message into a category250 in, 5 out, 50,000 a day | 0.54 cents | $8,100 |
| Read an invoice into fields1,500 in, 250 out, 1,000 a day | 5 cents | $1,500 |
| Review a pull request25,000 in, 4,500 out, 50 a day | 86 cents | $1,290 |
Cheaper models that score as well as o3-pro
Newest models with a lower blend price whose Epoch Capabilities Index score is about as high or higher, cheapest first. A score is an average over many benchmarks, so test one on your own work before you switch.
- Claude Haiku 5.5Anthropic
$0.20
per million at 3:1, score 159
Side by side - GPT-6 LunaOpenAI
$0.20
per million at 3:1, score 156
Side by side - DeepSeek V4.1 FlashDeepSeek
$0.525
per million at 3:1, score 156
Side by side - Gemini 3.8 FlashGoogle
$1.50
per million at 3:1, score 157
Side by side
Compare o3-pro
Both price lists side by side, and what the same 8 jobs cost on each.
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Every maker prints 2 main prices: one for the tokens a model reads (input) and one for the tokens it writes (output), each per million tokens. Writing costs more on almost every model, so a job that reads a long document and writes a line pays mostly the input price, and a chat that writes paragraphs pays mostly the output price. The blend, 3 tokens read for each 1 written, is one figure for ranking models on everyday work.
The other prices lower or raise the bill. Text read again from a cache costs a fraction of the input price, so a long system prompt or document sent with every request gets cheaper after the first. Work that can wait a day costs about half on a batch where the maker offers one. Some models charge more for every token once a prompt passes a set length.
Thinking is billed as output, and the same text is not the same number of tokens on every model, so the price per token is only the start. Each job below is priced the way the cost calculator prices it, at its usual runs a day for 30 days; open one to change its size, or compare the model with another side by side.
Questions
- How much does o3-pro cost?
- o3-pro costs $20 per million input tokens, the text it reads, and $80 per million output tokens, the text it writes, thinking included. On a mix of 3 tokens read for each 1 written, that is $35 per million.
- Does o3-pro have a batch price?
- Yes. With a batch, where you send many requests and collect the answers later instead of at once, o3-pro costs $10 per million tokens read and $40 per million written.
- What is the context window of o3-pro?
- o3-pro holds 200K tokens at once, about 300 pages of English text, and writes up to 100K tokens in one answer. The window holds your instructions, the files you attach, the conversation so far and the answer.
- How good is o3-pro?
- o3-pro scores 147 on the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, with a range of doubt from 146 to 150 (GPT-5 is 150). One score is an average; test it on 10 tasks of your own.
- Is there a cheaper model as good as o3-pro?
- Claude Haiku 5.5 from Anthropic scores 159 on the Epoch Capabilities Index, about as well or better, and costs $0.20 per million on a mix of 3 tokens read for each 1 written: o3-pro costs 175 times as much. Test both on your own work before you switch.
- Should I still use o3-pro?
- It is still sold, so it keeps working, but OpenAI's newest models are GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna. Compare its price with theirs below, and run your own tasks on the newer model before you move.
- What does a support bot cost a month on o3-pro?
- At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, a support bot costs 10 cents a reply on o3-pro, $6,240 a month.
- What does an AI agent task cost on o3-pro?
- One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs $59.20 on o3-pro. At 10 tasks a day that is $17,760 a month.
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