o3
OpenAIReleased Apr 16, 2025
o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following....
- Context window
- 200K tokens
- Max output
- 100K tokens
- Input
- image, text, file
- Output
- text
- Tokenizer
- GPT
- Knowledge cutoff
- Jun 30, 2024
- Released
- Apr 16, 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 | $2.00 | $0.060 | $2.06 |
| Output | $8.00 | $0.240 | $8.24 |
| Cache read | $0.500 | $0.015 | $0.515 |
Benchmarks
Design Arena
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| Codemodels | 1069 | 51.9% | #85 |
| Data vizmodels | 1200 | 48.1% | #49 |
| Game devmodels | 1100 | 56.9% | #78 |
| UI componentsmodels | 1073 | 53.3% | #79 |
| Websitesmodels | 1079 | 53.8% | #87 |
Head-to-head preference voting. How we filter and rank
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.
curl https://api.openkey.ai/v1/chat/completions \
-H "Authorization: Bearer $OPENKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/o3",
"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",
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",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Questions
- How much does o3 cost via API?
- Through OpenKey, o3 costs $2.06 per 1M input tokens and $8.24 per 1M output tokens. That is the provider price ($2.00 / $8.00) plus a flat 3% fee — nothing else.
- What is o3's context window?
- o3 accepts up to 200K tokens of context and returns up to 100K tokens per request.
- Is o3 OpenAI-compatible?
- Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "openai/o3" using any OpenAI SDK — only the base URL and API key change.
- What inputs does o3 support?
- o3 accepts image, text, file input and produces text output. Its knowledge cutoff is Jun 30, 2024.
More from OpenAI
All OpenAI models →GPT Chat Latest
GPT Chat Latest points to OpenAI's stable API alias `chat-latest` that always resolves to the latest Instant chat model used in ChatGPT. As OpenAI rolls out new Instant model updates...
ctx 400Kin $5.15out $30.90
OpenAI GPT Latest
This model always redirects to the latest model in the OpenAI GPT family.
ctx 1.1Min $5.15out $30.90
OpenAI GPT Mini Latest
This model always redirects to the latest model in the OpenAI GPT Mini family.
ctx 400Kin $0.772out $4.63
GPT-5.5
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
ctx 1.1Min $5.15out $30.90