Released 2 days after GPT-4.1 · All OpenAI releases
O4 Mini is OpenAI's compact reasoning model, a generation beyond O3 Mini with strong performance for its size and cost. It excels in mathematics and competitive programming, reaching 99.5 percent pass@1 on AIME 2025 when given access to a Python interpreter, and outperforms O3 Mini across STEM and non-STEM tasks including data science work. The model combines efficient reasoning with practical strengths in coding and visual understanding. It accepts text and image input, with a 200,000 token context window and up to 100,000 output tokens, and supports structured outputs, function calling, and streaming. O4 Mini can use tools within its reasoning, including web search, Python execution, image and file analysis, and image generation. It sustains higher usage limits than larger reasoning models, making it a strong choice for high-throughput applications that need reliable reasoning at lower cost.
O4 Mini runs on 1 route through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.
| Provider | Region | Zero data retention | Training | Input | Output |
|---|---|---|---|---|---|
| US | Not by default | No | $1.10 | $4.40 |
O4 Mini runs on a single route through the Opper gateway today, so its availability is that provider's availability.
Name a second model in the same request and the gateway tries it on retriable errors, so a busy hour never has to reach your users. Set up a fallback chain.
Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.
Each route hosting O4 Mini has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention is not on by default — abuse monitoring, 30-day retention. No training on customer data. US; SCCs; DPA available.
Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.
Call O4 Mini through the Opper gateway with one API key. Let your coding agent set it up, or call it directly — Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.
Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.
import OpenAI from "openai";const client = new OpenAI({apiKey: process.env.OPPER_API_KEY,baseURL: "https://api.opper.ai/v3/compat",});const completion = await client.chat.completions.create({model: "openai/o4-mini",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
