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POST
/
v1
/
messages
cURL
curl --request POST \
  --url https://api.concentrate.ai/v1/messages/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "messages": [
    {
      "role": "user",
      "content": "<string>"
    }
  ],
  "max_tokens": 123,
  "model": "<string>",
  "provider": "<string>",
  "system": "<string>",
  "temperature": 0.5,
  "top_p": 0.5,
  "top_k": 123,
  "stop_sequences": [
    "<string>"
  ],
  "stream": true,
  "tools": [],
  "tool_choice": {
    "type": "auto",
    "disable_parallel_tool_use": false
  },
  "metadata": {
    "user_id": "<string>"
  },
  "thinking": {
    "type": "enabled",
    "budget_tokens": 1025
  },
  "output_config": {
    "effort": "low",
    "format": {
      "type": "json_schema",
      "schema": {}
    }
  },
  "cache_control": {
    "type": "ephemeral",
    "ttl": "5m"
  }
}
'
{
  "id": "<string>",
  "type": "message",
  "role": "assistant",
  "model": "<string>",
  "content": [
    {
      "type": "text",
      "text": "<string>",
      "cache_control": {
        "type": "ephemeral",
        "ttl": "5m"
      },
      "citations": [
        {
          "type": "web_search_result_location",
          "title": "<string>",
          "url": "<string>",
          "cited_text": "<string>",
          "encrypted_index": "<string>"
        }
      ]
    }
  ],
  "usage": {
    "cache_creation_input_tokens": 0,
    "cache_read_input_tokens": 0,
    "inference_geo": "<string>",
    "input_tokens": 0,
    "output_tokens": 0,
    "server_tool_use": {
      "web_fetch_requests": 0,
      "web_search_requests": 0
    },
    "service_tier": "standard",
    "cache_creation": {
      "ephemeral_5m_input_tokens": 1,
      "ephemeral_1h_input_tokens": 1
    }
  },
  "cost": {
    "total": 123
  },
  "stop_reason": "end_turn",
  "stop_sequence": "<string>"
}

Documentation Index

Fetch the complete documentation index at: https://concentrate.ai/docs/llms.txt

Use this file to discover all available pages before exploring further.

Beta FeatureThe Messages API is currently in beta. It provides Anthropic Messages API compatibility for clients like Claude Code. For production use, we recommend using the Responses API instead.

​
Overview

The Messages API provides compatibility with the Anthropic Messages API format. It’s designed primarily for clients that expect Anthropic’s API structure, such as Claude Code and other tools built for Claude’s API.

Body

application/json
​
messages
object[]
required
Minimum array length: 1
​
max_tokens
integer
required
Required range: x <= 9007199254740991
​
model
string

Model identifier. Use /v1/models to list all available models. Supports canonical names (e.g. gpt-5.2, claude-opus-4-6), aliases, and provider-prefixed formats (e.g. openai/gpt-5.2). Use "auto" for automatic model selection.

​
provider
string

One of 3078 allowed values.

​
system
​
temperature
number | null
Required range: 0 <= x <= 1
​
top_p
number | null
Required range: 0 <= x <= 1
​
top_k
integer | null
Required range: x <= 9007199254740991
​
stop_sequences
string[] | null
​
stream
boolean | null
​
tools
object[]
​
tool_choice
object
​
metadata
object
​
thinking
object
​
output_config
object
​
cache_control
object

Response

Default Response

​
id
string
required
​
type
enum<string>
required
Available options:
message
​
role
enum<string>
required
Available options:
assistant
​
model
string
required
​
content
object[]
required
​
usage
object
required
​
cost
object
required
​
stop_reason
enum<string> | null
Available options:
end_turn,
max_tokens,
stop_sequence,
tool_use,
pause_turn,
refusal
​
stop_sequence
string | null