Released 2 days after GPT OSS 120B · All OpenAI releases
GPT-5 Nano is the fastest and most lightweight version of GPT-5, designed for tasks where speed matters most. With a 272k token context window and support for text and image input, structured output, and tool use, it covers a wide range of practical applications. The model is well suited to summarization, classification, and other simple tasks, serving as the lightest-weight option in OpenAI's GPT-5 lineup. It is a good fit for high-volume applications, responsive subagents, and workloads where latency directly shapes the product experience. Note that GPT-5.4 Nano offers improvements over this variant, with faster latency and stronger reasoning and tool use, making it the recommended choice for new projects.
Call GPT-5 Nano on Opper with the OpenAI SDK. Sign up without a credit card. Get started
GPT-5 Nano 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 Nano 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 Nano 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 Nano through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.
GPT-5 Nano 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-nano",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
