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gpt-5.5

Flagship-tier GPT model for general agents, structured outputs, tool calling, and multimodal application workflows.

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Overview

GPT-5.5 is positioned in the current GPT88 catalog as a flagship-tier OpenAI model for general-purpose applications, tools, and multimodal workflows.
It is a practical candidate for teams already using OpenAI-compatible SDKs and looking for a low-friction way to evaluate a higher-capability default.
The exact route, feature access, and operational limits remain specific to the current GPT88 console configuration.

Best Use Cases

Evaluate it for general-purpose agents, production SaaS, and complex workflows
Use it for workloads that need structured output, JSON parsing, or function calling
Test it on tasks that combine image understanding with text reasoning
Choose it when the team already uses an OpenAI-compatible toolchain and wants minimal integration changes

Integration Notes

Use the GPT88 Base URL https://api.gpt88.cc and set model to gpt-5.5 in OpenAI-compatible requests.
Start with a minimal /v1/chat/completions request, then add tools, structured output, streaming, or image inputs separately.
Keep the model ID, API key, and route configuration separate so staging and production can change independently.
Call GET /v1/models or check the console before rollout to confirm access for the current API key.

Usage Notes

Availability, pricing, context limits, rate limits, routes, permissions, vision, and tool support are determined by the current GPT88 console configuration.
If latency or usage is more important than maximum capability, compare a lighter GPT tier on the same evaluation set.
Use a staged rollout and measure output quality, errors, tool calls, latency, and usage before changing the production default.

Capabilities

Function callingVisual understandingStructured outputLong-context workflows

Recommended Scenarios

General-purpose agents
Production SaaS
Multimodal assistants
Complex workflows

Endpoint Path

POSThttps://api.gpt88.cc/v1/chat/completions

The endpoint path is determined by the model category. Chat, image, video, and audio models use different endpoints.

Send requests with Authorization: Bearer <API_KEY>. See Chat Completions API for the full parameter reference.

API Docs

Endpoint

POST /v1/chat/completions

Model ID

gpt-5.5

Content-Type

application/json

Protocol

OpenAI-compatible chat completions endpoint with streaming and non-streaming output.

Base URL

Use https://api.gpt88.cc for OpenAI SDK, Cursor, and cURL.

Headers / Auth

Field	Type	Required	Description
`Authorization`	string	Required	Send `Bearer <GPT88_API_KEY>`. Create the API key in the gpt88.cc console.
`Content-Type`	string	Required	Request body format. Audio transcription uploads use `multipart/form-data`. Default:`application/json`
`Accept`	string	Optional	Non-streaming requests return JSON; streaming chat requests return SSE chunks. Default:`application/json or text/event-stream`

AuthorizationstringRequired
Send Bearer <GPT88_API_KEY>. Create the API key in the gpt88.cc console.
Content-TypestringRequired
Request body format. Audio transcription uploads use multipart/form-data.
Default:application/json
Acceptstring
Non-streaming requests return JSON; streaming chat requests return SSE chunks.
Default:application/json or text/event-stream

Chat Protocol Differences

For chat models, the protocol used by the client matters as much as the model name. Claude Code / Anthropic SDK and OpenAI SDK build different request paths.

OpenAI CompatibleRecommended

Base URL: https://api.gpt88.cc
Endpoint: POST /v1/chat/completions
Body: { "model": "gpt-5.5", "messages": [...] }

Anthropic / Claude

Base URL: https://api.gpt88.cc
Endpoint: POST /v1/messages
Body: { "model": "gpt-5.5", "messages": [...] }

This model is usually best accessed through the OpenAI-compatible protocol. Only use the Anthropic-style path when the target tool explicitly requires it.

Request Parameters

The fields below are generated by model category. Pricing, context limits, rate limits, and available routes should be confirmed in the gpt88.cc console.

Field	Type	Required	Description
`model`	string	Required	Current model ID: `gpt-5.5`. Preserve the exact casing when copying.
`messages`	array<Message>	Required	Conversation history. Each message includes `role` and `content`.
`stream`	boolean	Optional	Enable SSE streaming. Useful for chat interfaces and long responses. Default:`false`
`temperature`	number	Optional	Sampling temperature. Higher values produce more variation; production workloads usually start with a fixed value. Default:`1`
`max_tokens`	integer	Optional	Maximum output tokens for this request. Real context limits should be confirmed in the console.
`response_format`	object	Optional	Structured output config, for example `{ "type": "json_object" }`.
`tools`	array<Tool>	Optional	Function-calling tool definitions. Availability depends on the model and account configuration.

modelstringRequired
Current model ID: gpt-5.5. Preserve the exact casing when copying.
messagesarray<Message>Required
Conversation history. Each message includes role and content.
streamboolean
Enable SSE streaming. Useful for chat interfaces and long responses.
Default:false
temperaturenumber
Sampling temperature. Higher values produce more variation; production workloads usually start with a fixed value.
Default:1
max_tokensinteger
Maximum output tokens for this request. Real context limits should be confirmed in the console.
response_formatobject
Structured output config, for example { "type": "json_object" }.
toolsarray<Tool>
Function-calling tool definitions. Availability depends on the model and account configuration.

Response Fields

Response bodies generally follow OpenAI-compatible shapes. Media models may return async task IDs or resource URLs.

Field	Type	Required	Description
`id`	string	Required	Unique completion ID for tracing and debugging.
`object`	string	Required	Usually `chat.completion` or a streaming chunk type.
`model`	string	Required	Actual model ID that handled inference.
`choices`	array<Choice>	Required	Generated choices including `message`, `delta`, and `finish_reason`.
`usage`	object	Optional	Token usage statistics. Streaming calls may return this only at the end or in non-streaming mode.

idstringRequired
Unique completion ID for tracing and debugging.
objectstringRequired
Usually chat.completion or a streaming chunk type.
modelstringRequired
Actual model ID that handled inference.
choicesarray<Choice>Required
Generated choices including message, delta, and finish_reason.
usageobject
Token usage statistics. Streaming calls may return this only at the end or in non-streaming mode.

Status Codes

Field	Type	Required	Description
`200`	OK	Required	Request succeeded. See the response field table above for the response body shape.
`400`	Bad Request	Optional	Invalid request fields, such as missing required fields, unsupported image size format, or unsupported file type.
`401`	Unauthorized	Optional	API key is missing, invalid, or malformed.
`404`	Not Found	Optional	Endpoint or model not found. Confirm the path is `/v1/chat/completions` and the model ID is `gpt-5.5`.
`429`	Rate Limited	Optional	Rate limit, concurrency cap, or insufficient balance. Check the console for the current allowance.
`5xx`	Upstream Error	Optional	Upstream or request failure. Retry with the same Base URL and keep the request ID for debugging.

200OKRequired
Request succeeded. See the response field table above for the response body shape.
400Bad Request
Invalid request fields, such as missing required fields, unsupported image size format, or unsupported file type.
401Unauthorized
API key is missing, invalid, or malformed.
404Not Found
Endpoint or model not found. Confirm the path is /v1/chat/completions and the model ID is gpt-5.5.
429Rate Limited
Rate limit, concurrency cap, or insufficient balance. Check the console for the current allowance.
5xxUpstream Error
Upstream or request failure. Retry with the same Base URL and keep the request ID for debugging.

Errors and Troubleshooting

401: verify Authorization is Bearer <API_KEY> and the key is still valid.
404: confirm the endpoint is /v1/chat/completions and the model ID gpt-5.5 is available in the console.
429: reduce concurrency, shorten requests, or check balance and quota in the console.
5xx: retry with the same Base URL and keep the request ID for debugging.

Request Examples

curl https://api.gpt88.cc/v1/chat/completions \
  -H "Authorization: Bearer $GPT88_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "messages": [
      {"role": "user", "content": "Introduce gpt88.cc in one sentence."}
    ]
  }'

Expected response (trimmed example):

200 OKjson

{
  "id": "chatcmpl-gpt-5-5",
  "object": "chat.completion",
  "created": 1730000000,
  "model": "gpt-5.5",
  "choices": [
    {
      "index": 0,
      "finish_reason": "stop",
      "message": { "role": "assistant", "content": "..." }
    }
  ],
  "usage": { "prompt_tokens": 24, "completion_tokens": 64, "total_tokens": 88 }
}