WanAPIs Chat Completions API
Chat completion endpoints (OpenAI Chat Completions compatible).
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OpenAPI Specification
openapi: 3.2.0
info:
title: WanAPIs Unified AI Chat API
version: '2026-05-27'
summary: OpenAI-compatible AI gateway aggregating GPT, Claude, Gemini, DeepSeek and other LLM, image, video, and audio model providers behind a single key.
description: WanAPIs (https://wanapis.com) is a developer-focused AI API gateway.
termsOfService: https://wanapis.com/
contact:
name: WanAPIs Support
email: support@wanapis.com
url: https://wanapis.com/
license:
name: Proprietary
url: https://wanapis.com/
servers:
- url: https://api.wanapis.com/v1
description: WanAPIs production OpenAI-compatible base URL.
security:
- bearerAuth: []
tags:
- name: Chat Completions
description: Chat completion endpoints (OpenAI Chat Completions compatible).
paths:
/chat/completions:
post:
tags:
- Chat Completions
operationId: createChatCompletion
summary: Create a chat completion
description: 'OpenAI-compatible chat completions. Set `model` to any model slug
available in the WanAPIs marketplace (e.g. `claude-opus-4-7`,
`deepseek-v4-pro`, `gemini-3.5-flash`, `gpt-5.5`).'
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/ChatCompletionRequest'
examples:
deepseek:
summary: DeepSeek chat completion
value:
model: deepseek-v4-pro
messages:
- role: user
content: 用三句话解释 RAG
responses:
'200':
description: Chat completion result.
content:
application/json:
schema:
$ref: '#/components/schemas/ChatCompletionResponse'
text/event-stream:
schema:
type: string
description: 'Server-Sent Events stream of `ChatCompletionChunk` objects when `stream: true`.'
'401':
$ref: '#/components/responses/Unauthorized'
'403':
$ref: '#/components/responses/Forbidden'
'429':
$ref: '#/components/responses/RateLimited'
'500':
$ref: '#/components/responses/UpstreamFailure'
components:
responses:
RateLimited:
description: Rate limit or quota exceeded.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
Unauthorized:
description: Missing or invalid API key.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
Forbidden:
description: Key does not have access to the requested model or feature.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
UpstreamFailure:
description: Upstream provider failure (500–504). Retry with exponential backoff; WanAPIs may auto-failover to a configured channel.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
schemas:
ChatCompletionRequest:
type: object
required:
- model
- messages
properties:
model:
type: string
description: Marketplace model slug (e.g. claude-opus-4-7).
messages:
type: array
items:
$ref: '#/components/schemas/ChatMessage'
stream:
type: boolean
default: false
max_tokens:
type: integer
temperature:
type: number
minimum: 0
maximum: 2
top_p:
type: number
minimum: 0
maximum: 1
n:
type: integer
default: 1
stop:
oneOf:
- type: string
- type: array
items:
type: string
presence_penalty:
type: number
frequency_penalty:
type: number
seed:
type: integer
response_format:
type: object
tools:
type: array
items:
type: object
tool_choice:
oneOf:
- type: string
- type: object
user:
type: string
ChatMessage:
type: object
required:
- role
- content
properties:
role:
type: string
enum:
- system
- user
- assistant
- tool
content:
oneOf:
- type: string
- type: array
items:
type: object
name:
type: string
tool_call_id:
type: string
tool_calls:
type: array
items:
type: object
Error:
type: object
properties:
error:
type: object
properties:
message:
type: string
type:
type: string
code:
type: string
param:
type: string
nullable: true
ChatCompletionResponse:
type: object
properties:
id:
type: string
object:
type: string
const: chat.completion
created:
type: integer
model:
type: string
choices:
type: array
items:
type: object
properties:
index:
type: integer
message:
$ref: '#/components/schemas/ChatMessage'
finish_reason:
type: string
usage:
$ref: '#/components/schemas/Usage'
Usage:
type: object
properties:
prompt_tokens:
type: integer
completion_tokens:
type: integer
total_tokens:
type: integer
securitySchemes:
bearerAuth:
type: http
scheme: bearer
bearerFormat: API Key
description: 'Authenticate every request with `Authorization: Bearer <wanapis_api_key>`.
Keys are issued per project in the WanAPIs dashboard and may be scoped
with quota and model availability.
'