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OpenKey

GPT-5.4

OpenAIReleased Mar 5, 2026

GPT-5.4 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for...

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Context window
1.1M tokens
Max output
128K tokens
Input
text, image, file
Output
text
Tokenizer
GPT
Released
Mar 5, 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$2.50$0.075$2.58
Output$15.00$0.450$15.45
Cache read$0.250$0.0075$0.258

Benchmarks

Artificial Analysis

Intelligence index
51.4
Coding index
71.1
Agentic index
41.1

Design Arena

CategoryEloWin rateRank
3Dmodels118043%#50
ASCII artmodels123754.3%#12
Codemodels126353.4%#28
Data vizmodels127556.8%#18
Game devmodels130658%#13
SVGmodels125458.1%#12
UI componentsmodels129758.3%#14
Websitesmodels126553.4%#27
androidnativeagents104147.5%#26
Full-stackagents108540.8%#24
godotgamedevagents117246.9%#14
Mobile appsagents115344.4%#25
Web appsagents113841.7%#20

Head-to-head preference voting. How we filter and rank

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.

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",
    "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",
    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",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does GPT-5.4 cost via API?
Through OpenKey, GPT-5.4 costs $2.58 per 1M input tokens and $15.45 per 1M output tokens. That is the provider price ($2.50 / $15.00) plus a flat 3% fee — nothing else.
What is GPT-5.4's context window?
GPT-5.4 accepts up to 1.1M tokens of context and returns up to 128K tokens per request.
Is GPT-5.4 OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "openai/gpt-5.4" using any OpenAI SDK — only the base URL and API key change.
What inputs does GPT-5.4 support?
GPT-5.4 accepts text, image, file input and produces text output.

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