---
title: "GPT-5 Mini | AI Models | Inference.net"
description: "Run GPT-5 Mini (OpenAI) on Inference.net. 400K context. tool-calling, structured outputs, vision input, reasoning. Knowledge cutoff May 2024. Deploy with an OpenAI-compatible API and pay-per-token pricing."
url: "https://inference.net/models/gpt-5-mini/"
---

OpenAI Multimodal Model

# GPT-5 Mini

A compact GPT-5 reasoning model that balances capability against cost. Configurable reasoning effort from minimal to high across a 400K context makes it a strong default for production agents that need reasoning without flagship pricing.

[Get Started](https://inference.net/signin/) [Documentation](https://docs.inference.net)

Model details

Developed by OpenAI

Context window 391K tokens

Max output 125K tokens

Model API pricing Per 1M tokens

Input $0.25

Cache read $0.025

Output $2.00

[See all pricing](https://inference.net/pricing/)

```
import OpenAI from "openai";

const openai = new OpenAI({
  baseURL: "https://api.inference.net/v1",
  apiKey: "<YOUR_API_KEY>",
});

const completion = await openai.chat.completions.create({
  model: "gpt-5-mini",
  messages: [
    {
      role: "user",
      content: "What is the meaning of life?"
    }
  ],
  stream: true,
});

for await (const chunk of completion) {
  process.stdout.write(chunk.choices[0]?.delta.content as string);
}
```

Prompt caching

1. Keep the prompt prefix byte-identical across calls: same text, same order.
2. Pass a stable prompt_cache_key string. It is a routing-affinity hint; it does not create or identify cached content.
3. Check usage.prompt_tokens_details.cached_tokens in the response to confirm cache reads.

```
{
  "model": "gpt-4o",
  "prompt_cache_key": "v1-stable-prefix",
  "messages": [{ "role": "user", "content": "..." }]
}
```

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[Schematron V2 Turbo 125K input context $0.03 / $0.15](https://inference.net/models/schematron-v2-turbo/)

## Start building with GPT-5 Mini today

Serverless, OpenAI-compatible, and billed per token. No commitments.

[Get Started](https://inference.net/signin/) [Read the docs](https://docs.inference.net)