o3 Pro
OpenAIReleased Jun 10, 2025
The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently...
- Context window
- 200K tokens
- Max output
- 100K tokens
- Input
- text, file, image
- Output
- text
- Tokenizer
- GPT
- Knowledge cutoff
- Jun 30, 2024
- Released
- Jun 10, 2025
- Reasoning
- optional
Pricing
Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.
| Per 1M tokens | Provider | + 3% fee | You pay |
|---|---|---|---|
| Input | $20.00 | $0.600 | $20.60 |
| Output | $80.00 | $2.40 | $82.40 |
Supported parameters
- include_reasoning
- max_tokens
- reasoning
- response_format
- seed
- structured_outputs
- tool_choice
- tools
Call it
OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model openai/o3-pro.
curl https://api.openkey.ai/v1/chat/completions \
-H "Authorization: Bearer $OPENKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/o3-pro",
"messages": [{"role": "user", "content": "Hello"}]
}'import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.openkey.ai/v1",
api_key=os.environ["OPENKEY_API_KEY"],
)
completion = client.chat.completions.create(
model="openai/o3-pro",
messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.openkey.ai/v1",
apiKey: process.env.OPENKEY_API_KEY,
});
const completion = await client.chat.completions.create({
model: "openai/o3-pro",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Questions
- How much does o3 Pro cost via API?
- Through OpenKey, o3 Pro costs $20.60 per 1M input tokens and $82.40 per 1M output tokens. That is the provider price ($20.00 / $80.00) plus a flat 3% fee — nothing else.
- What is o3 Pro's context window?
- o3 Pro accepts up to 200K tokens of context and returns up to 100K tokens per request.
- Is o3 Pro OpenAI-compatible?
- Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "openai/o3-pro" using any OpenAI SDK — only the base URL and API key change.
- What inputs does o3 Pro support?
- o3 Pro accepts text, file, image input and produces text output. Its knowledge cutoff is Jun 30, 2024.
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