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...
- 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 tokens | Provider | + 3% fee | You 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
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| 3Dmodels | 1180 | 43% | #50 |
| ASCII artmodels | 1237 | 54.3% | #12 |
| Codemodels | 1263 | 53.4% | #28 |
| Data vizmodels | 1275 | 56.8% | #18 |
| Game devmodels | 1306 | 58% | #13 |
| SVGmodels | 1254 | 58.1% | #12 |
| UI componentsmodels | 1297 | 58.3% | #14 |
| Websitesmodels | 1265 | 53.4% | #27 |
| androidnativeagents | 1041 | 47.5% | #26 |
| Full-stackagents | 1085 | 40.8% | #24 |
| godotgamedevagents | 1172 | 46.9% | #14 |
| Mobile appsagents | 1153 | 44.4% | #25 |
| Web appsagents | 1138 | 41.7% | #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.
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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