Claude Sonnet 4.5 is described by Anthropic as the best coding model in the world and its strongest model for building complex agents. It marks a large step in computer interaction, scoring 61.4% on OSWorld for real-world computer operations, up sharply from 42.2% in the previous version. Sonnet 4.5 reaches state-of-the-art results on SWE-bench Verified for real-world software engineering. It maintains focus on complex multi-step assignments for over 30 hours, with notable gains in reasoning and mathematical problem solving across multiple benchmarks. With a 200K token context window and support for tools, vision, and PDF processing, Sonnet 4.5 handles computer automation tasks like navigating websites, filling spreadsheets, and completing browser-based workflows. It is described as Anthropic's most aligned frontier model to that point, with reduced concerning behaviors.
Claude Sonnet 4.5 runs on 5 different routes through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.
| Provider | Region | Zero data retention | Training | Input | Output |
|---|---|---|---|---|---|
| Anthropic | US | Enterprise | No | $3.00 | $15.00 |
| AWS Bedrock | EU | Zero data retention | No | $3.30 | $16.50 |
| Azure | EU | Enterprise | No | $3.00 | $15.00 |
| Google Cloud | US | Enterprise | No | $3.00 | $15.00 |
| Google Cloud | EU | Enterprise | No | $3.30 | $16.50 |
Training posture across routes: No training on prompts by default.
Each route hosting Claude Sonnet 4.5 has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.
Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. EU; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. EU; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. EU; DPA available.
Call Claude Sonnet 4.5 through the Opper gateway with one API key. Let your coding agent set it up, or call it directly — Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.
Copy this and paste it into your coding agent — Claude Code, Cursor, Codex, and more — and it'll wire up Opper for you.
import OpenAI from "openai";const client = new OpenAI({apiKey: process.env.OPPER_API_KEY,baseURL: "https://api.opper.ai/v3/compat",});const completion = await client.chat.completions.create({model: "anthropic/claude-sonnet-4-5",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
