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1h ago

Anthropic Launches Claude Sonnet 4.5 With 30-Hour Autonomous Runs and Top Coding Scores

The release pairs a frontier model with enterprise tooling at steady pricing to accelerate long‑running AI agents.

Anthropic logo is seen in this illustration created on May 20, 2024. REUTERS/Dado Ruvic/Illustration/File Photo
Image
Claude 4

Overview

  • Anthropic says Sonnet 4.5 can operate autonomously for about 30 hours on complex, multi‑step tasks, up from roughly seven hours reported for Opus 4.
  • The model leads key coding and computer‑use benchmarks, including SWE‑Bench Verified and a record 61.4% on OSWorld.
  • Anthropic highlights expanded safety training with AI Safety Level 3 protections and reduced risks such as sycophancy, deception, and prompt‑injection.
  • Sonnet 4.5 is available now in Claude.ai, the API, and Claude Code at the same price as Sonnet 4 — $3 per million input tokens and $15 per million output tokens.
  • New developer and enterprise features include Claude Code checkpoints, a native VS Code extension, a Claude Agent SDK, and early integrations such as Microsoft 365 Copilot features and Databricks workspace rollout.