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OpenKey

GPT-4.1

OpenAIReleased Apr 14, 2025

GPT-4.1 is a flagship large language model optimized for advanced instruction following, real-world software engineering, and long-context reasoning. It supports a 1 million token context window and outperforms GPT-4o and...

Try in playground
Context window
1.0M tokens
Input
image, text, file
Output
text
Tokenizer
GPT
Knowledge cutoff
Jun 30, 2024
Released
Apr 14, 2025

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$2.00$0.060$2.06
Output$8.00$0.240$8.24
Cache read$0.500$0.015$0.515

Benchmarks

Design Arena

CategoryEloWin rateRank
3Dmodels92630.9%#95
Codemodels107550.9%#84
Data vizmodels114759.5%#65
Game devmodels114559.1%#66
UI componentsmodels105649.7%#80
Websitesmodels108152.3%#86

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

Supported parameters

  • max_completion_tokens
  • max_tokens
  • response_format
  • seed
  • structured_outputs
  • temperature
  • tool_choice
  • tools
  • top_p

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model openai/gpt-4.1.

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-4.1",
    "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-4.1",
    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-4.1",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does GPT-4.1 cost via API?
Through OpenKey, GPT-4.1 costs $2.06 per 1M input tokens and $8.24 per 1M output tokens. That is the provider price ($2.00 / $8.00) plus a flat 3% fee — nothing else.
What is GPT-4.1's context window?
GPT-4.1 accepts up to 1.0M tokens of context.
Is GPT-4.1 OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "openai/gpt-4.1" using any OpenAI SDK — only the base URL and API key change.
What inputs does GPT-4.1 support?
GPT-4.1 accepts image, text, file input and produces text output. Its knowledge cutoff is Jun 30, 2024.

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