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OpenKey

o4 Mini

OpenAIReleased Apr 16, 2025

OpenAI o4-mini is a compact reasoning model in the o-series, optimized for fast, cost-efficient performance while retaining strong multimodal and agentic capabilities. It supports tool use and demonstrates competitive reasoning...

Try in playground
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 tokensProvider+ 3% feeYou pay
Input$1.10$0.033$1.13
Output$4.40$0.132$4.53
Cache read$0.275$0.0083$0.283

Benchmarks

Design Arena

CategoryEloWin rateRank
3Dmodels93034%#94
Codemodels102546.4%#94
Data vizmodels103550%#87
Game devmodels106950%#82
UI componentsmodels104046.9%#83
Websitesmodels102847.1%#96

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/o4-mini.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/o4-mini",
    "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/o4-mini",
    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/o4-mini",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does o4 Mini cost via API?
Through OpenKey, o4 Mini costs $1.13 per 1M input tokens and $4.53 per 1M output tokens. That is the provider price ($1.10 / $4.40) plus a flat 3% fee — nothing else.
What is o4 Mini's context window?
o4 Mini accepts up to 200K tokens of context and returns up to 100K tokens per request.
Is o4 Mini OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "openai/o4-mini" using any OpenAI SDK — only the base URL and API key change.
What inputs does o4 Mini support?
o4 Mini accepts image, text, file input and produces text output. Its knowledge cutoff is Jun 30, 2024.

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