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gpt-5.6-luna

Lightweight tier in the GPT-5.6 preview family for frequent short requests, preprocessing, classification, and agent subtasks.

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Overview

  • GPT-5.6 Luna is the lightweight tier in the GPT-5.6 preview family represented in the current GPT88 catalog.
  • It is positioned for frequent, shorter, latency-sensitive, and cost-sensitive tasks such as routing, preprocessing, summaries, classification, and intermediate agent steps.
  • Luna should be evaluated as one layer in a model-routing strategy rather than assumed to replace stronger tiers on every complex task.

Best Use Cases

  • Use it for short-text classification, tagging, summaries, formatting, and lower-risk content generation
  • Assign it bounded agent subtasks such as intent detection, tool selection, field extraction, or intermediate planning
  • Evaluate it for interactive requests where low latency matters and the cost of an individual error is limited
  • Pair it with Terra or Sol so difficult, long-context, or high-value tasks can be escalated

Integration Notes

  • Use the GPT88 Base URL https://api.gpt88.cc and set model to gpt-5.6-luna in OpenAI-compatible requests.
  • Define explicit escalation rules so Luna handles bounded tasks while longer or more complex work moves to Terra or Sol.
  • Load-test concurrency, timeout, and retry behavior before using it for batch automation.
  • Call GET /v1/models or check the console to confirm that the current API key can access the model.

Usage Notes

  • Availability, pricing, context limits, rate limits, routes, and tool support are determined by the current GPT88 console configuration.
  • GPT-5.6 Luna is a preview model. Its behavior and supported parameters may change, so validate it through a staged rollout with an escalation path.
  • Do not use a lightweight tier as the only model for complex research, important code changes, or high-risk decisions.
  • If quality is inconsistent, first check prompt length and task scope, then compare the same request with Terra or Sol.

Capabilities

GPT-5.6 previewLow-latency positioningHigh-throughput positioningFunction calling

Recommended Scenarios

  • Batch classification
  • Log summarization
  • Agent subtasks
  • Content triage

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-5.6-luna
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

  • 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-5.6-luna", "messages": [...] }
Anthropic / Claude
Base URL
https://api.gpt88.cc
Endpoint
POST /v1/messages
Body
{ "model": "gpt-5.6-luna", "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.

  • modelstringRequired
    Current model ID: gpt-5.6-luna. 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.

  • 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

  • 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-5.6-luna.
  • 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-5.6-luna 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-5.6-luna",
    "messages": [
      {"role": "user", "content": "Introduce gpt88.cc in one sentence."}
    ]
  }'

Expected response (trimmed example):

200 OKjson
{
  "id": "chatcmpl-gpt-5-6-",
  "object": "chat.completion",
  "created": 1730000000,
  "model": "gpt-5.6-luna",
  "choices": [
    {
      "index": 0,
      "finish_reason": "stop",
      "message": { "role": "assistant", "content": "..." }
    }
  ],
  "usage": { "prompt_tokens": 24, "completion_tokens": 64, "total_tokens": 88 }
}