curl --request POST \
  --url https://direct.evolink.ai/v1/chat/completions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "glm-5.3",
  "messages": [
    {
      "role": "user",
      "content": "Hello, please introduce yourself in one sentence"
    }
  ]
}
'

{
  "id": "chatcmpl-a6613b56-c61c-94ba-9a9f-43d4cdc7d77a",
  "object": "chat.completion",
  "request_id": "req-7f3a2c1e8b9d4f0a",
  "created": 1777021417,
  "model": "glm-5.3",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hello! I'm GLM-5.3, and I can help you with a variety of tasks such as conversation, reasoning, writing, and code.",
        "reasoning_content": "Let me first analyze this problem...",
        "tool_calls": [
          {
            "id": "<string>",
            "type": "function",
            "function": {
              "name": "<string>",
              "arguments": "<string>"
            }
          }
        ]
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 24,
    "completion_tokens": 346,
    "total_tokens": 370,
    "prompt_tokens_details": {
      "cached_tokens": 0
    },
    "completion_tokens_details": {
      "reasoning_tokens": 321
    }
  },
  "content_filter": [
    {
      "role": "assistant",
      "level": 1
    }
  ]
}

{
  "error": {
    "code": 400,
    "message": "Invalid request parameters",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": 401,
    "message": "Invalid or expired token",
    "type": "authentication_error"
  }
}

{
  "error": {
    "code": 402,
    "message": "Insufficient quota",
    "type": "insufficient_quota_error",
    "fallback_suggestion": "https://evolink.ai/dashboard/billing"
  }
}

{
  "error": {
    "code": 403,
    "message": "Access denied for this model",
    "type": "permission_error",
    "param": "model"
  }
}

{
  "error": {
    "code": 404,
    "message": "Specified model not found",
    "type": "not_found_error",
    "param": "model",
    "fallback_suggestion": "glm-5.3"
  }
}

{
  "error": {
    "code": 429,
    "message": "Rate limit exceeded",
    "type": "rate_limit_error",
    "fallback_suggestion": "retry after 60 seconds"
  }
}

{
  "error": {
    "code": 500,
    "message": "Internal server error",
    "type": "internal_server_error",
    "fallback_suggestion": "try again later"
  }
}

{
  "error": {
    "code": 502,
    "message": "Upstream AI service unavailable",
    "type": "upstream_error",
    "fallback_suggestion": "try different model"
  }
}

{
  "error": {
    "code": 503,
    "message": "Service temporarily unavailable",
    "type": "service_unavailable_error",
    "fallback_suggestion": "retry after 30 seconds"
  }
}

Chat Completions API

GLM All-Model API - Chat Completions Quickstart

Call GLM series models through the OpenAI Chat Completions protocol, choosing the specific model with the model parameter
model and messages are the only parameters you need
1M token context window across the series, with up to 131,072 output tokens
Deep thinking is on by default across the series, and the reasoning is returned in reasoning_content
For streaming, tool calls, thinking-depth control, image input and other capabilities, see the Reference page

POST

chat

completions

curl --request POST \
  --url https://direct.evolink.ai/v1/chat/completions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "glm-5.3",
  "messages": [
    {
      "role": "user",
      "content": "Hello, please introduce yourself in one sentence"
    }
  ]
}
'

{
  "id": "chatcmpl-a6613b56-c61c-94ba-9a9f-43d4cdc7d77a",
  "object": "chat.completion",
  "request_id": "req-7f3a2c1e8b9d4f0a",
  "created": 1777021417,
  "model": "glm-5.3",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hello! I'm GLM-5.3, and I can help you with a variety of tasks such as conversation, reasoning, writing, and code.",
        "reasoning_content": "Let me first analyze this problem...",
        "tool_calls": [
          {
            "id": "<string>",
            "type": "function",
            "function": {
              "name": "<string>",
              "arguments": "<string>"
            }
          }
        ]
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 24,
    "completion_tokens": 346,
    "total_tokens": 370,
    "prompt_tokens_details": {
      "cached_tokens": 0
    },
    "completion_tokens_details": {
      "reasoning_tokens": 321
    }
  },
  "content_filter": [
    {
      "role": "assistant",
      "level": 1
    }
  ]
}

{
  "error": {
    "code": 400,
    "message": "Invalid request parameters",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": 401,
    "message": "Invalid or expired token",
    "type": "authentication_error"
  }
}

{
  "error": {
    "code": 402,
    "message": "Insufficient quota",
    "type": "insufficient_quota_error",
    "fallback_suggestion": "https://evolink.ai/dashboard/billing"
  }
}

{
  "error": {
    "code": 403,
    "message": "Access denied for this model",
    "type": "permission_error",
    "param": "model"
  }
}

{
  "error": {
    "code": 404,
    "message": "Specified model not found",
    "type": "not_found_error",
    "param": "model",
    "fallback_suggestion": "glm-5.3"
  }
}

{
  "error": {
    "code": 429,
    "message": "Rate limit exceeded",
    "type": "rate_limit_error",
    "fallback_suggestion": "retry after 60 seconds"
  }
}

{
  "error": {
    "code": 500,
    "message": "Internal server error",
    "type": "internal_server_error",
    "fallback_suggestion": "try again later"
  }
}

{
  "error": {
    "code": 502,
    "message": "Upstream AI service unavailable",
    "type": "upstream_error",
    "fallback_suggestion": "try different model"
  }
}

{
  "error": {
    "code": 503,
    "message": "Service temporarily unavailable",
    "type": "service_unavailable_error",
    "fallback_suggestion": "retry after 30 seconds"
  }
}

BaseURL: The default BaseURL is https://direct.evolink.ai, which has better support for text models and long-lived connections. https://api.evolink.ai is the primary endpoint for multimodal services and serves as a fallback address for text models.

Authorizations

Authorization

string

header

required

##All APIs require Bearer Token authentication##

Get API Key:

Visit API Key Management Page to get your API Key

Add to request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json

model

enum<string>

default:glm-5.3

required

Model to call:

Model ID	Positioning
`glm-5.3`	Flagship model, with across-the-board gains on complex software engineering and agent tasks; 1M context
`glm-5.3-flash`	Lightweight multimodal model, extremely low cost, native image input; 1M context
`glm-5.2`	Previous-generation flagship, complex reasoning and very long context; 1M context

Available options:

glm-5.3,

glm-5.3-flash,

glm-5.2

Example:

"glm-5.3"

messages

Message · object[]

required

The list of conversation messages, in chronological order. At least one message is required.

Minimum array length: 1

Show child attributes

Response

Chat completion generated successfully

string

Task ID

Example:

"chatcmpl-a6613b56-c61c-94ba-9a9f-43d4cdc7d77a"

object

enum<string>

Response type

Available options:

chat.completion

Example:

"chat.completion"

request_id

string

Request ID (returned when request_id is provided in the request)

Example:

"req-7f3a2c1e8b9d4f0a"

created

integer

Request creation time, Unix timestamp (seconds)

Example:

1777021417

model

string

Model name

Example:

"glm-5.3"

choices

object[]

The list of model responses

Show child attributes

usage

object

Token usage statistics returned when the call ends

Show child attributes

content_filter

object[]

Content safety-related information

Show child attributes

Image Series

Video Series

Audio Series

Text Series

Account Management

Task Management

File Management

GLM All-Model API - Chat Completions Quickstart

Authorizations

Body

Response