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POST
/
v1
/
messages
claude-3-5-haiku-20241022 (text to text)
curl --request POST \
  --url https://api.example.com/v1/messages
Claude’s official format for the text to text API. 
curl -X POST "https://gptproto.com/v1/messages" \
  -H "Authorization: YOUR_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "claude-3-5-haiku-20241022",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Who are you?"
    }
  ]
}'

{
  "error": {
    "type": "authentication_error",
    "message": "Invalid API key"
  }
}

​
Parameters

ParameterTypeRequiredDefaultDescription
modelstring✅ Yesclaude-3-5-haiku-20241022The model to use for the request
messagesarray✅ Yes[{'role': 'user', 'content': 'Who are you?'}]Array of message objects for the conversation. Each message must have a role (user or assistant) and content.
max_tokensinteger✅ Yes1024The maximum number of tokens to generate before stopping
temperaturenumber❌ No1.0Amount of randomness injected into the response. Ranges from 0.0 to 1.0
top_pnumber❌ No1.0Use nucleus sampling. Ranges from 0.0 to 1.0
top_kinteger❌ NonullOnly sample from the top K options for each subsequent token
streamboolean❌ NofalseWhether to incrementally stream the response using server-sent events
stop_sequencesarray❌ No-Custom text sequences that will cause the model to stop generating

​
Messages Array Structure

Each message object in the messages array should have the following structure:
FieldTypeRequiredDescription
rolestring✅ YesThe role of the message. Can be: user, assistant, or system
contentarray/string✅ YesThe content of the message

​
Content Array Structure (when content is an array)

FieldTypeRequiredExampleDescription
typestring✅ YestextThe type of content
textstring✅ Yes"The positive prompt for the generation."The text content when type is text