gpt-5.4GPT-5.4 is our frontier model for complex professional work. Served via the OpenAI Responses API (`/v1/responses`) — append `-low / -medium / -high / -xhigh` to the model name to dial reasoning depth. Drop-in for OpenAI Codex CLI with wire_api = "responses".
Latest GPT generation for complex professional work
Suffix the model name to set effort: -low / -medium / -high / -xhigh
Served at /v1/responses upstream — use wire_api = "responses" in Codex
Reasoning tokens are billed as part of output_tokens at the same rate
View complete API reference with all parameters and examples.
Enable real-time streaming responses with Server-Sent Events.
{
"model": "gpt-5.4",
"stream": true,
"messages": [...]
}Enable the model to use tools and call functions.
{
"model": "gpt-5.4",
"tools": [{
"type": "function",
"function": {
"name": "get_weather",
"description": "Get current weather for a location",
"parameters": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "City name"}
},
"required": ["location"]
}
}
}],
"messages": [{"role": "user", "content": "What's the weather in Tokyo?"}]
}Get structured JSON responses from the model.
{
"model": "gpt-5.4",
"response_format": {"type": "json_object"},
"messages": [{"role": "user", "content": "Extract info as JSON: John is 30 years old"}]
}| Parameter | Type | Required | Description |
|---|---|---|---|
| model | string | Yes | Model identifier (e.g., gpt-5.4) |
| messages | array | Yes | Array of message objects with role and content |
| max_tokens | integer | No | Maximum tokens in the response |
| stream | boolean | No | Enable streaming responses (SSE) |
| temperature | number | No | Sampling temperature (0.0 - 2.0) |
| top_p | number | No | Nucleus sampling threshold (0.0 - 1.0) |
| tools | array | No | Function calling tools definition |
| response_format | object | No | Output format (e.g., json_object) |
View complete API reference with streaming, thinking, and more.
Billing: Cost = (input_tokens * input_price + output_tokens * output_price) / 1,000,000
GPT-5.4 is a Large Language Model API provided by OpenAI. GPT-5.4 is our frontier model for complex professional work. Served via the OpenAI Responses API (`/v1/responses`) — append `-low / -medium / -high / -xhigh` to the model name to dial reasoning depth. Drop-in for OpenAI Codex CLI with wire_api = "responses". Through API Models platform, you can access this model via a unified API at prices significantly lower than official rates. Current pricing: Input: $0.552, Output: $4.412 per 1M tokens.
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GPT-5.4 is available through API Models at: Input: $0.552, Output: $4.412 per 1M tokens. This is up to 95% cheaper than official pricing.
Sign up at API Models, get your API key, and call our unified API endpoint. We provide detailed API documentation with code examples in cURL, Python, and Node.js.
API Models offers the same GPT-5.4 model at 60-95% lower cost through our aggregation platform. We provide a unified API interface so you do not need separate accounts for each provider - one API key to access all models.
GPT-5.4 supports: Frontier, Responses API, Tunable Reasoning, Codex-Compatible. See the API Models docs for full parameters and call examples.
Yes. API Models exposes GPT-5.4 through a single unified API and one key — no separate provider accounts, and no need to handle each provider's regional network access yourself.
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