> For the complete documentation index, see [llms.txt](https://docs.aimlapi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aimlapi.com/api-references/text-models-llm/openai/gpt-5-5-pro.md).
# GPT 5.5 Pro
{% columns %}
{% column width="66.66666666666666%" %}
{% hint style="info" %}
This documentation is valid for the following list of our models:
* `openai/gpt-5-5-pro`
{% endhint %}
{% endcolumn %}
{% column width="33.33333333333334%" %} Try in Playground
{% endcolumn %}
{% endcolumns %}
## Model Overview
OpenAI’s flagship model and one of its best offerings as of late April 2026. Designed for maximum quality, reliability, and performance in critical or high-precision workloads. Ideal for advanced reasoning, premium generation quality, and complex production workflows.\
This model can only be called via the `/responses` endpoint.
{% hint style="success" %}
[Create AI/ML API Key](https://aimlapi.com/app/keys)
{% endhint %}
How to make the first API call
**1️⃣ Required setup (don’t skip this)**\
▪ **Create an account:** Sign up on the AI/ML API website (if you don’t have one yet).\
▪ **Generate an API key:** In your account dashboard, create an API key and make sure it’s **enabled** in the UI.
**2️ Copy the code example**\
At the bottom of this page, pick the snippet for your preferred programming language (Python / Node.js) and copy it into your project.
**3️ Update the snippet for your use case**\
▪ **Insert your API key:** replace `` with your real AI/ML API key.\
▪ **Select a model:** set the `model` field to the model you want to call.\
▪ **Provide input:** fill in the request input field(s) shown in the example (for example, `messages` for chat/LLM models, or other inputs for image/video/audio models).
**4️ (Optional) Tune the request**\
Depending on the model type, you can add optional parameters to control the output (e.g., generation settings, quality, length, etc.). See the API schema below for the full list.
**5️ Run your code**\
Run the updated code in your development environment. Response time depends on the model and request size, but simple requests typically return quickly.
{% hint style="success" %}
If you need a more detailed walkthrough for setting up your development environment and making a request step by step — feel free to use our [Quickstart guide](broken://pages/ngeSCZKxiGVWqYZTHDjY).
{% endhint %}
## API Schema
## Code Example
{% tabs %}
{% tab title="Python" %}
{% code overflow="wrap" %}
```python
import requests
import json # for getting a structured output with indentation
response = requests.post(
"https://api.aimlapi.com/v1/responses",
headers={
# Insert your AIML API Key instead of :
"Authorization":"Bearer ",
"Content-Type":"application/json"
},
json={
"model":"openai/gpt-5-5-pro",
"messages":[
{
"role":"user",
"content":"Hi! What do you think about mankind?" # insert your prompt
}
]
}
)
data = response.json()
print(json.dumps(data, indent=2, ensure_ascii=False))
```
{% endcode %}
{% endtab %}
{% tab title="JavaScript" %}
{% code overflow="wrap" %}
```javascript
async function main() {
const response = await fetch('https://api.aimlapi.com/v1/chat/completions', {
method: 'POST',
headers: {
// insert your AIML API Key instead of
'Authorization': 'Bearer ',
'Content-Type': 'application/json',
},
body: JSON.stringify({
model: 'openai/gpt-5-5-pro',
messages:[
{
role:'user',
content: 'Hi! What do you think about mankind?' // insert your prompt here
}
],
}),
});
const data = await response.json();
console.log(JSON.stringify(data, null, 2));
}
main();
```
{% endcode %}
{% endtab %}
{% endtabs %}
Response
{% code overflow="wrap" %}
```json5
{
"id": "Chyyu2KgZuNhSnHKMr8dO",
"object": "response",
"created_at": 1777249873,
"status": "completed",
"background": false,
"billing": {
"payer": "developer"
},
"completed_at": 1777249891,
"error": null,
"frequency_penalty": 0,
"incomplete_details": null,
"instructions": null,
"max_output_tokens": null,
"max_tool_calls": null,
"model": "gpt-5.5-pro-2026-04-23",
"moderation": null,
"output": [
{
"id": "rs_002611bcb314c3ad0069eeae63a18c81939ee43c6302aea5fa",
"type": "reasoning",
"summary": []
},
{
"id": "msg_002611bcb314c3ad0069eeae63a3248193aabe8d57c839e0ab",
"type": "message",
"status": "completed",
"content": [
{
"type": "output_text",
"annotations": [],
"logprobs": [],
"text": "Hi! I don’t have personal feelings in the human sense, but my perspective is that mankind is deeply contradictory and remarkable: capable of cruelty, shortsightedness, and destruction, but also compassion, imagination, courage, science, art, humor, and self-sacrifice.\n\nWhat stands out most is humanity’s ability to *reflect on itself*—to ask what is good, to learn from mistakes, to build meaning, and to care about people far beyond one’s immediate circle. That capacity gives mankind both danger and hope.\n\nSo, in short: humanity is flawed, powerful, and still unfinished. At its best, it’s astonishing."
}
],
"phase": "final_answer",
"role": "assistant"
}
],
"parallel_tool_calls": true,
"presence_penalty": 0,
"previous_response_id": null,
"prompt_cache_key": null,
"prompt_cache_retention": "24h",
"reasoning": {
"effort": "high",
"summary": null
},
"safety_identifier": null,
"service_tier": "default",
"store": true,
"temperature": 1,
"text": {
"format": {
"type": "text"
},
"verbosity": "medium"
},
"tool_choice": "auto",
"tools": [],
"top_logprobs": 0,
"top_p": 0.98,
"truncation": "disabled",
"usage": {
"input_tokens": 15,
"input_tokens_details": {
"cached_tokens": 0
},
"output_tokens": 249,
"output_tokens_details": {
"reasoning_tokens": 114
},
"total_tokens": 264
},
"user": null,
"metadata": {},
"output_text": "Hi! I don’t have personal feelings in the human sense, but my perspective is that mankind is deeply contradictory and remarkable: capable of cruelty, shortsightedness, and destruction, but also compassion, imagination, courage, science, art, humor, and self-sacrifice.\n\nWhat stands out most is humanity’s ability to *reflect on itself*—to ask what is good, to learn from mistakes, to build meaning, and to care about people far beyond one’s immediate circle. That capacity gives mankind both danger and hope.\n\nSo, in short: humanity is flawed, powerful, and still unfinished. At its best, it’s astonishing."
}
```
{% endcode %}
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.aimlapi.com/api-references/text-models-llm/openai/gpt-5-5-pro.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.