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OpenKey

GPT-5.4 Mini

OpenAIReleased Mar 17, 2026

GPT-5.4 mini brings the core capabilities of GPT-5.4 to a faster, more efficient model optimized for high-throughput workloads. It supports text and image inputs with strong performance across reasoning, coding,...

Try in playground
Context window
400K tokens
Max output
128K tokens
Input
file, image, text
Output
text
Tokenizer
GPT
Knowledge cutoff
Aug 31, 2025
Released
Mar 17, 2026
Reasoning
optional

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
Input$0.750$0.022$0.772
Output$4.50$0.135$4.63
Cache read$0.075$0.0022$0.077

Benchmarks

Artificial Analysis

Intelligence index
40
Coding index
56.1
Agentic index
30.2

Supported parameters

  • include_reasoning
  • max_completion_tokens
  • max_tokens
  • reasoning
  • response_format
  • seed
  • structured_outputs
  • tool_choice
  • tools

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model openai/gpt-5.4-mini.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4-mini",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="openai/gpt-5.4-mini",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "openai/gpt-5.4-mini",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does GPT-5.4 Mini cost via API?
Through OpenKey, GPT-5.4 Mini costs $0.772 per 1M input tokens and $4.63 per 1M output tokens. That is the provider price ($0.750 / $4.50) plus a flat 3% fee — nothing else.
What is GPT-5.4 Mini's context window?
GPT-5.4 Mini accepts up to 400K tokens of context and returns up to 128K tokens per request.
Is GPT-5.4 Mini OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "openai/gpt-5.4-mini" using any OpenAI SDK — only the base URL and API key change.
What inputs does GPT-5.4 Mini support?
GPT-5.4 Mini accepts file, image, text input and produces text output. Its knowledge cutoff is Aug 31, 2025.

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