Claude 3 Haiku Serverless API

Claude 3 Haiku, the fastest and most cost-effective model LLM from Anthropic, delivers instant responses and image analysis. Build interactive AI experiences that mimic human conversation. Perfect for various applications, from research to enterprise

~4.31s

Playground API

Pricing

~4.31s

API Format: Anthropic Claude

This model uses Anthropic Claude request/response format.

POST /v2/claude-3-haiku · submit + poll

 1# pip install "segmind>=1.1.0"
 2# export SEGMIND_API_KEY="YOUR_API_KEY"
 3import segmind
 4
 5payload = {
 6    "instruction": "You are a helpful assistant.",
 7    "messages": [
 8        {
 9            "role": "user",
10            "content": "What is the capital of France?"
11        }
12    ]
13}
14
15# Async chat (v2): submit to the queue, block until COMPLETED.
16reply = segmind.chat("claude-3-haiku", **payload)
17print(reply.text)
18
19# --- Or get a handle (track request_id, control the poll cadence) ---
20job = segmind.submit_chat("claude-3-haiku", **payload)
21print(job.request_id)                         # available immediately
22reply = job.wait(timeout=600)
23print(reply.text)

 1# pip install "segmind>=1.1.0"
 2# export SEGMIND_API_KEY="YOUR_API_KEY"
 3import segmind
 4
 5payload = {
 6    "instruction": "You are a helpful assistant.",
 7    "messages": [
 8        {
 9            "role": "user",
10            "content": "What is the capital of France?"
11        }
12    ]
13}
14
15# Async chat (v2): submit to the queue, block until COMPLETED.
16reply = segmind.chat("claude-3-haiku", **payload)
17print(reply.text)
18
19# --- Or get a handle (track request_id, control the poll cadence) ---
20job = segmind.submit_chat("claude-3-haiku", **payload)
21print(job.request_id)                         # available immediately
22reply = job.wait(timeout=600)
23print(reply.text)

API Endpoint

POST https://api.segmind.com/v1/claude-3-haiku

Parameters

messagesrequired

object[]

Array of message objects with role and content.

Array items:

rolerequired

string

Role of the message sender

Allowed values :

"user""assistant"

contentrequired

array

Array of content blocks (text or image)

instructionoptional

string

System instruction that guides the model's behavior (replaces system message).

Response Format

{
  "id": "msg_abc123",
  "type": "message",
  "role": "assistant",
  "content": [
    {
      "type": "text",
      "text": "I can see a beautiful sunset over the ocean with vibrant orange and pink hues in the sky."
    }
  ],
  "model": "claude-3-haiku",
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 56,
    "output_tokens": 31
  }
}

Asynchronous requests (v2)

Use Async for video, long-running (>~60s), or high-concurrency workloads; Sync is simplest for fast image & LLM calls. Async submits a request and you poll it to completion.

1
POST /v2/claude-3-haiku
Submit — returns request_id, status_url, response_url
2
GET /v2/requests/{id}/status
Poll — until COMPLETED or FAILED
3
GET /v2/requests/{id}
Result — final response body

Status states

QUEUED— Accepted, waiting for a worker

PROCESSING— Running on a worker

COMPLETED— Done — result body is ready

FAILED— Errored (incl. content/RAI blocks)

A FAILED request is served as HTTP 422 — the body still carries the error detail.
An unknown or expired request_id returns HTTP 404.
Results are retained for 1 hour, then expire.
Content / RAI blocks surface as FAILED, not a separate state.
Track completion by polling the status endpoint.

Common Error Codes

The API returns standard HTTP status codes. Detailed error messages are provided in the response body.

400

Bad Request

Invalid message format or parameters

401

Unauthorized

Missing or invalid API key

403

Forbidden

Insufficient permissions

404

Not Found

Model or endpoint not found

406

Insufficient Credits

Not enough credits to process request

429

Rate Limited

Too many requests

500

Server Error

Internal server error

502

Bad Gateway

Service temporarily unavailable

504

Timeout

Request timed out