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Anthropic Launches Claude Sonnet 4.5 with New Coding and Agentic State-of-the-Art Results

ByRicardo

Anthropic launched Claude Sonnet 4.5 and units a brand new benchmark for end-to-end software program engineering and real-world pc use. The replace additionally ships concrete product floor modifications (Claude Code checkpoints, a local VS Code extension, API reminiscence/context instruments) and an Agent SDK that exposes the identical scaffolding Anthropic makes use of internally. Pricing stays unchanged from Sonnet 4 ($3 enter / $15 output per million tokens).

What’s truly new?

  • SWE-bench Verified file. Anthropic stories 77.2% accuracy on the 500-problem SWE-bench Verified dataset utilizing a easy two-tool scaffold (bash + file edit), averaged over 10 runs, no test-time compute, 200K “considering” price range. A 1M-context setting reaches 78.2%, and a higher-compute setting with parallel sampling and rejection raises this to 82.0%.
  • Computer-use SOTA. On OSWorld-Verified, Sonnet 4.5 leads at 61.4%, up from Sonnet 4’s 42.2%, reflecting stronger instrument management and UI manipulation for browser/desktop duties.
  • Long-horizon autonomy. The group noticed >30 hours of uninterrupted concentrate on multi-step coding duties — a sensible bounce over earlier limits and straight related to agent reliability.
  • Reasoning/math. The launch notes “substantial good points” throughout frequent reasoning and math evals; precise per-bench numbers (e.g., AIME config). Safety posture is ASL-3 with strengthened defenses towards prompt-injection.
https://www.anthropic.com/information/claude-sonnet-4-5

What’s there for brokers?

Sonnet 4.5 targets the brittle elements of actual brokers: prolonged planning, reminiscence, and dependable instrument orchestration. Anthropic’s Claude Agent SDK exposes their manufacturing patterns (reminiscence administration for long-running duties, permissioning, sub-agent coordination) relatively than only a naked LLM endpoint. That means groups can reproduce the identical scaffolding utilized by Claude Code (now with checkpoints, a refreshed terminal, and VS Code integration) to maintain multi-hour jobs coherent and reversible.

On measured duties that simulate “utilizing a pc,” the 19-point bounce on OSWorld-Verified is notable; it tracks with the mannequin’s skill to navigate, fill spreadsheets, and full net flows in Anthropic’s browser demo. For enterprises experimenting with agentic RPA-style work, increased OSWorld scores often correlate with decrease intervention charges throughout execution.

Where you’ll be able to run it?

  • Anthropic API & apps. Model ID claude-sonnet-4-5; worth parity with Sonnet 4. File creation and code execution at the moment are obtainable straight in Claude apps for paid tiers.
  • AWS Bedrock. Available by way of Bedrock with integration paths to AgentCore; AWS highlights long-horizon agent periods, reminiscence/context options, and operational controls (observability, session isolation).
  • Google Cloud Vertex AI. GA on Vertex AI with help for multi-agent orchestration by way of ADK/Agent Engine, provisioned throughput, 1M-token evaluation jobs, and immediate caching.
  • GitHub Copilot. Public preview rollout throughout Copilot Chat (VS Code, net, cell) and Copilot CLI; organizations can allow by way of coverage, and BYO key’s supported in VS Code.

Summary

With a documented 77.2% SWE-bench Verified rating beneath clear constraints, a 61.4% OSWorld-Verified computer-use lead, and sensible updates (checkpoints, SDK, Copilot/Bedrock/Vertex availability), Claude Sonnet 4.5 is developed for long-running, tool-heavy agent workloads relatively than quick demo prompts. Independent replication will decide how sturdy the “greatest for coding” declare is, however the design targets (autonomy, scaffolding, and pc management) are aligned with actual manufacturing ache factors at this time.

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