How do I use GPT-5.4 Nano through YepAPI?

Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.

OpenAIText Generation/v1/ai/chat

GPT-5.4 Nano

Access GPT-5.4 Nano through one API key. Ultra-cheap for high-volume tasks.

OpenAI's ultra-affordable model. Designed for high-volume, low-latency tasks where cost efficiency is critical.

Full Docs Get API Key — Free $5 Credit

No credit card required. Takes 30 seconds.

2,400+

Developers

1.2M+

API calls served

100+

Endpoints

$0.01

Per call

Yep, that's it.

Try it live

Send a message and see GPT-5.4 Nano respond in real time.

POST/v1/ai/chatopenai/gpt-5.4-nano

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Context Window

400K tokens

Max Output

16K tokens

Input Price

$0.28 / 1M tokens

Output Price

$1.75 / 1M tokens

Strengths

✓

Ultra low cost

At $0.28 per 1M input and $1.75 per 1M output tokens, it's OpenAI's cheapest GPT-5.4-generation model for the highest-volume work.

✓

Lowest latency

Tuned for the fastest responses in the family, ideal for real-time UIs and tasks where speed is the constraint.

✓

400K context

Despite being the smallest tier, it reads up to 400,000 tokens per request, so it can still handle long inputs.

✓

High throughput

Low cost and latency make it suited to processing massive batches of requests where per-call expense compounds.

Quick start

Copy this snippet and start making calls with GPT-5.4 Nano.

const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "model": "openai/gpt-5.4-nano",
    "messages": [
      {
        "role": "user",
        "content": "Explain API gateways in 2 sentences."
      }
    ],
    "maxTokens": 256
  }),
});
const { data } = await res.json();
console.log(data.message.content);

Why use GPT-5.4 Nano through YepAPI?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

GPT-5.4 Nano API — pricing, context window & access

GPT-5.4 Nano is OpenAI's ultra-affordable, lowest-latency model in the GPT-5.4 family, built for high-volume, speed-critical tasks. It keeps a large 400,000-token context window and returns up to 16,384 output tokens per response.

With YepAPI you reach GPT-5.4 Nano through one OpenAI-compatible key — the same key that also covers GPT-5.4 Mini and the full GPT-5.4, GPT-5.5, Claude, Gemini, and the SEO, SERP and scraping APIs.

What is GPT-5.4 Nano?

GPT-5.4 Nano is the smallest, cheapest, and fastest model in OpenAI's GPT-5.4 family, below GPT-5.4 Mini and the full flagship. It's engineered for high-volume, low-latency tasks where cost efficiency is critical — classification, routing, simple extraction, and other well-defined work at massive scale. Unusually for an entry-tier model, it retains a 400,000-token context window, so it can still take in long inputs. It's the model you reach for when you need GPT-5.4-generation behavior at the lowest possible price per call.

Build with GPT-5.4 Nano via YepAPI

YepAPI serves GPT-5.4 Nano on the OpenAI-compatible /v1/ai/chat endpoint. Use the chat-completions format and the model string gpt-5.4-nano — no new SDK. When a request needs more depth, escalating to GPT-5.4 Mini or the full GPT-5.4 is a one-string change, which makes Nano a natural cheap first pass. The same key also reaches search and scraping endpoints, so high-volume Nano pipelines and your data jobs share a single account.

GPT-5.4 Nano API pricing — $0.28 / 1M input, $1.75 / 1M output

GPT-5.4 Nano costs $0.28 per 1M input tokens and $1.75 per 1M output tokens through YepAPI — the cheapest way into the GPT-5.4 generation. That pricing is built for scale: jobs measured in millions of tokens, like tagging, routing, and bulk extraction, stay inexpensive even at huge volumes. The 400K context means you don't sacrifice input length for the low price. You pay only for tokens used, with no minimums or commitments.

GPT-5.4 Nano for high-volume, low-latency tasks

Nano is the volume tier. Its lowest-in-family latency keeps real-time interfaces responsive, and its ultra-low price lets you run it across enormous batches without runaway cost. Use it for classification, routing, moderation, and first-pass extraction — then escalate only the ambiguous cases to a larger model. The 400K context means even high-throughput pipelines can hand it long inputs, so you rarely have to chunk just to keep costs down.

Try GPT-5.4 Nano free

Every new YepAPI account includes $5 in free credit with no card required. At Nano's rates, that covers a large amount of real high-volume testing before you commit. Sign up, copy your key, and start calling GPT-5.4 Nano right away.