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Claude Sonnet 4.5 Model Support

Added support for Anthropic's Claude Sonnet 4.5

Claude Sonnet models available via Anthropic provider on LLM Gateway

We're excited to announce support for Claude Sonnet 4.5, the latest balanced model from Anthropic, now available through LLM Gateway.

📊 Model Specifications

Claude Sonnet 4.5

  • Model ID: claude-sonnet-4-5
  • Provider: Anthropic
  • Context Window: 200,000 tokens
  • Input Price: $3.00 per million tokens
  • Output Price: $15.00 per million tokens

Optimized for fast, intelligent responses across a wide range of applications with excellent cost-performance.

🚀 Getting Started

Use model identifier claude-sonnet-4-5 in your API calls to access the model.

AI SDK

import { llmgateway } from "@llmgateway/ai-sdk-provider";
import { generateText } from "ai";


const { text } = await generateText({
  model: llmgateway("claude-sonnet-4-5"),
  prompt: `Analyze this complex document with your 400k context window...`,
});

API

curl -X POST https://api.llmgateway.io/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5",
    "messages": [{"role": "user", "content": "Hello GPT-5!"}]
  }'

Try it now in the new Chat Playground 🚀

    Claude Sonnet 4.5 Model Support - Changelog - LLM Gateway