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Kimi K3.1 Pro

Moonshot Kimi K3.1 Pro for long-horizon coding, 3D creation, financial research, and agent workflows.

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Overview

  • Moonshot launched Kimi K3.1 Pro on October 23, 2026 as the first model in its K3.1 series. Moonshot describes it as a 3T-class model with a 1M-token context window and improvements in coding, 3D creation, finance, and agentic work.
  • The Moonshot API model ID is kimi-k3.1-pro; the Highspeed variant is kimi-k3.1-pro-highspeed. Check the GPT88 console and GET /v1/models for current account availability and routing.
  • Moonshot-reported benchmarks and Artificial Analysis evaluations both indicate stronger agentic performance, but use different harnesses, datasets, and evaluation conditions.

Best Use Cases

  • Multi-step engineering tasks in a terminal harness
  • Generating or iterating on 3D/CAD assets from images or text
  • Retrieval and analysis across long financial documents
  • Long-context and tool-using agent evaluations with verifiable outcomes

Integration Notes

  • Use https://api.gpt88.cc for GPT88 and check GET /v1/models for kimi-k3.1-pro before making a minimal request through a supported compatible endpoint.
  • Moonshot API IDs are kimi-k3.1-pro and kimi-k3.1-pro-highspeed. IDs can differ across products and third-party gateways.
  • Kimi Code documentation says K3.1 Pro requires thinking mode. Confirm reasoning parameter support in the current client and gateway.

Usage Notes

  • Most launch scores are vendor-reported. Comparisons may combine different harnesses and leaderboard sources; read each benchmark footnote.
  • Artificial Analysis gave it 55 on its Intelligence Index and ranked it fourth at publication. This is one organization’s composite metric, not a universal task ranking.
  • A 1M context limit does not guarantee latency, quota, or task cost. Measure actual tokens, cache use, retries, and success rate.
  • GPT88 routes, pricing, limits, permissions, and features follow the current console and API key; Moonshot list prices do not establish GPT88 billing.

Capabilities

1M-token contextLong-horizon coding3D modelingFinancial researchVision

Recommended Scenarios

  • Complex coding and terminal tasks
  • 3D/CAD modeling
  • Financial document analysis
  • Long-horizon agents

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
kimi-k3.1-pro
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-compatible and Claude-style tools.

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": "kimi-k3.1-pro", "messages": [...] }
Anthropic / Claude
Base URL
https://api.gpt88.cc
Endpoint
POST /v1/messages
Body
{ "model": "kimi-k3.1-pro", "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: kimi-k3.1-pro. 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 kimi-k3.1-pro.
  • 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 kimi-k3.1-pro 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": "kimi-k3.1-pro",
    "messages": [
      {"role": "user", "content": "Introduce gpt88.cc in one sentence."}
    ]
  }'

Expected response (trimmed example):

200 OKjson
{
  "id": "chatcmpl-kimi-k3-",
  "object": "chat.completion",
  "created": 1730000000,
  "model": "kimi-k3.1-pro",
  "choices": [
    {
      "index": 0,
      "finish_reason": "stop",
      "message": { "role": "assistant", "content": "..." }
    }
  ],
  "usage": { "prompt_tokens": 24, "completion_tokens": 64, "total_tokens": 88 }
}