GPT-5.4 Mini
Access GPT-5.4 Mini through one API key. Smart and affordable with 400K context.
OpenAI's latest cost-effective model. Great balance of capability and price with a 400K context window.
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 Mini respond in real time.
Maximum tokens in the response.
Real-time tokens
Context Window
400K tokens
Max Output
16K tokens
Input Price
$1.11 / 1M tokens
Output Price
$6.65 / 1M tokens
Strengths
At $1.11 per 1M input and $6.65 per 1M output tokens, it brings GPT-5.4-generation quality to budgets that can't justify the full flagship.
Reads up to 400,000 tokens per request — far more than older mid-tier models — for long documents and codebases.
Lower latency than the full GPT-5.4 makes it a good fit for interactive apps and higher-volume workloads.
Punches above its tier on reasoning and coding, returning up to 16,384 output tokens per response.
Quick start
Copy this snippet and start making calls with GPT-5.4 Mini.
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-mini",
"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 Mini through YepAPI?
GPT-5.4 Mini API — pricing, context window & access
GPT-5.4 Mini is OpenAI's cost-effective member of the GPT-5.4 family, balancing capability and price with a large 400,000-token context window. It returns up to 16,384 output tokens per response.
Through YepAPI you call GPT-5.4 Mini on an OpenAI-compatible endpoint with one key — the same key that also reaches GPT-5.4, GPT-5.4 Nano, GPT-5.5, Claude, Gemini, and the SEO, SERP and scraping endpoints.
What is GPT-5.4 Mini?
GPT-5.4 Mini is the mid-tier, cost-effective model in OpenAI's GPT-5.4 family, sitting between the ultra-cheap GPT-5.4 Nano and the full GPT-5.4 flagship. It's designed to deliver a great balance of capability and price, with a 400,000-token context window that's far larger than older mid-tier models offered. It's the model to choose when GPT-5.4-generation quality matters but the flagship's cost doesn't fit — a smart, affordable default for everyday reasoning, coding, and long-document work at scale.
Build with GPT-5.4 Mini via YepAPI
YepAPI exposes GPT-5.4 Mini through the OpenAI-compatible /v1/ai/chat endpoint, so you use the chat-completions format and the model string gpt-5.4-mini. Escalating to the full GPT-5.4 for harder tasks, dropping to GPT-5.4 Nano for cheap high-volume work, or switching to Claude or Gemini is a one-string change. The same key also covers search and scraping endpoints, so a tiered model strategy plus your data pipelines all run on one account.
GPT-5.4 Mini API pricing — $1.11 / 1M input, $6.65 / 1M output
GPT-5.4 Mini costs $1.11 per 1M input tokens and $6.65 per 1M output tokens through YepAPI — a fraction of the full GPT-5.4 flagship's rate. That makes it economical to run GPT-5.4-generation quality across higher volumes, and its 400K context lets you pass long inputs without splitting them. It's a strong everyday default: cheap enough for scale, capable enough for real work. You pay only for tokens used, with no minimums.
GPT-5.4 Mini for cost-effective scale
GPT-5.4 Mini is built for the middle of a tiered strategy. Its 400K context and solid reasoning handle long-document summarization, coding, and analysis, while its low price and faster responses let you run those tasks at volume. Use it as your workhorse — reserve the full GPT-5.4 or GPT-5.5 for genuinely hard cases and push trivial, high-frequency calls down to GPT-5.4 Nano — and most requests can land here without sacrificing much quality.
Try GPT-5.4 Mini free
New YepAPI accounts get $5 in free credit, no card required. At GPT-5.4 Mini's rates that's enough to run substantial real workloads before committing. Sign up, grab your key, and start calling GPT-5.4 Mini in minutes.
Start generating in 30 seconds
$5 free credit on signup. No credit card required. Pay per call.
What developers say
“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Frequently asked questions
OpenAI's latest cost-effective model. Great balance of capability and price with a 400K context window.
Input tokens cost $1.11 per 1M tokens and output tokens cost $6.65 per 1M tokens through YepAPI. No monthly minimums — you only pay for what you use.
Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.
GPT-5.4 Mini supports a 400K token context window with up to 16K output tokens per request.
Ready to use GPT-5.4 Mini?
$5 free credit on signup. No credit card required. Pay per call.
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