GPT-5 Mini is a faster, more cost-efficient version of GPT-5 built for well-defined tasks and precise prompts. It delivers near-frontier intelligence for low-latency, high-volume workloads and works well as a fallback for users and organizations managing usage on larger models. With a 272k token context window, GPT-5 Mini supports text input and output, image input, structured output, and tool use. It excels at summarization, classification, data extraction, and lightweight reasoning where latency is a primary constraint. Note that GPT-5.4 Mini offers significant improvements over this variant, with more than 2x faster latency and stronger coding, reasoning, and multimodal understanding, making it the recommended choice for new projects that need small-model performance.
Call GPT-5 Mini on Opper with the OpenAI SDK. Sign up without a credit card. Get started
GPT-5 Mini runs on 2 different routes through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below.
GPT-5 Mini runs on 2 independently monitored routes through the Opper gateway. A direct integration leaves you on one of them, the gateway serves whichever is healthy.
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 GPT-5 Mini has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention with abuse monitoring: nothing is logged or used for training; content flagged by abuse monitoring is held for review. No training on customer data. EU; DPA available.
Zero data retention with abuse monitoring: prompts and outputs are kept for up to 30 days for abuse monitoring only, and are not used for training. 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 GPT-5 Mini through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.
GPT-5 Mini is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.
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: "gpt-5-mini",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
