Using Claude Sonnet 4 on Vercel AI Gateway

Implementation guide · Claude 4 · Anthropic

Serverless

Vercel AI Gateway exposes Claude Sonnet 4 through model ID anthropic/claude-sonnet-4. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-07-26. Next refresh: weekly.

Quick Start

1
Create an account at Vercel AI Gateway and generate an API key.
2
Use the Vercel AI Gateway SDK or REST API to call anthropic/claude-sonnet-4 — see the documentation for request format.
3
You'll be billed $3.00/1M input, $15.00/1M output tokens. See full pricing.

API Portal Documentation Pricing Model Card

Code Examples

Install

pip install openai

API key

AI_GATEWAY_API_KEY

Model ID

anthropic/claude-sonnet-4

creator/model-name e.g. kwaipilot/kat-coder-pro-v2

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["AI_GATEWAY_API_KEY"],
    base_url="https://ai-gateway.vercel.sh/v1"
)
response = client.chat.completions.create(
    model="anthropic/claude-sonnet-4",
    messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)

Pricing on Vercel AI Gateway

Type	Price (per 1M)
Input tokens	$3.00
Output tokens	$15.00
Query	$10.00

Capabilities

VisionMultimodalStructured Outputs

About Claude Sonnet 4

Claude Sonnet 4 API snapshot (claude-sonnet-4-20250514) is deprecated and scheduled to retire from Anthropic-operated platforms on June 15, 2026. Use Claude Sonnet 4.6 for current integrations.

Full model details →

Model Specs

Released2025-08-01

Context200k

Vercel