claude-haiku-4-5 API

What is claude-haiku-4-5?

Use the public identifier gapgpt-claude-haiku-4-5-f72e9feca7 for claude-haiku-4-5 in ServerNet. The gateway uses this identifier to select the configured route; the developer is Anthropic.

For claude-haiku-4-5, check the configured context limit and supported tools on this route. The compatible chat format does not imply support for every native Claude API feature.

Where to use claude-haiku-4-5

• Add claude-haiku-4-5 to a support assistant that receives the relevant conversation as text.
• Test claude-haiku-4-5 on summaries and extraction using your own documents, with a small output limit first.
• Compare answer quality, total token usage and cost per completed task before choosing claude-haiku-4-5 for production.

Build your integration

Send system and user messages, set max_tokens and store X-Request-Id with your usage record. Stream only when this route supports it. Function calls describe actions for your application to run; the gateway does not execute your tools.

Inputs and service limits

The current chat route accepts text only and one completion per request. Images, audio and hosted paid tools are not enabled by the source model’s capabilities. The configured context and output limits may be below the developer’s maximum. Test language quality on your own dataset.

Connect to claude-haiku-4-5 API

Enable ai:chat on your key and ai:models:read to check availability. Set SERVERNET_API_KEY in your server environment. Change the idempotency key for each new request; keep it unchanged only for an identical retry.

This example documents the request format. Send it only after this model appears in GET /v1/models.

curl https://servernet.cloud/v1/chat/completions \
  -H "Authorization: Bearer $SERVERNET_API_KEY" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: CHANGE_FOR_EACH_NEW_REQUEST' \
  -d '{
    "model": "gapgpt-claude-haiku-4-5-f72e9feca7",
    "messages": [
        {
            "role": "user",
            "content": "Hello"
        }
    ],
    "max_tokens": 128
}'

import json, os, urllib.request
from uuid import uuid4

body = json.loads("{\n    \"model\": \"gapgpt-claude-haiku-4-5-f72e9feca7\",\n    \"messages\": [\n        {\n            \"role\": \"user\",\n            \"content\": \"Hello\"\n        }\n    ],\n    \"max_tokens\": 128\n}")
request = urllib.request.Request(
    "https://servernet.cloud/v1/chat/completions",
    data=json.dumps(body).encode(),
    headers={
        "Authorization": "Bearer " + os.environ["SERVERNET_API_KEY"],
        "Content-Type": "application/json",
        "Idempotency-Key": str(uuid4()),
    },
    method="POST",
)
with urllib.request.urlopen(request) as response:
    print(json.load(response))

import { randomUUID } from 'node:crypto';

const response = await fetch('https://servernet.cloud/v1/chat/completions', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer ' + process.env.SERVERNET_API_KEY,
    'Content-Type': 'application/json',
    'Idempotency-Key': randomUUID(),
  },
  body: JSON.stringify({
    "model": "gapgpt-claude-haiku-4-5-f72e9feca7",
    "messages": [
        {
            "role": "user",
            "content": "Hello"
        }
    ],
    "max_tokens": 128
}),
});
if (!response.ok) throw new Error('HTTP ' + response.status);
console.log(await response.json());

Use the same Idempotency-Key when retrying an identical request. Successful responses are replayed without a second charge for 24 hours. Do not automatically retry when x-should-retry:false is present. The key is shown once. Store it in a server environment variable. Keep it out of browser code, GitHub and logs.

Compare models for the same task