Anthropic Introduces Claude Opus 4.5

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Anthropic has released Claude Opus 4.5, positioning it as their leading model for coding, autonomous agents, and computer use, offered at an accessible price point of $5 per million input tokens and $25 per million output tokens.

Key points

  1. Now available via the Claude API as claude-opus-4-5-20251101, across major cloud platforms, and within Claude consumer and desktop apps.
  2. Priced at $5 per million input tokens and $25 per million output tokens, substantially lowering the barrier for Opus-tier models.
  3. Leads benchmarks including SWE-bench Multilingual across 7 out of 8 languages and shows a 10.6% improvement over Sonnet 4.5 on Aider Polyglot.
  4. Outperformed all previous human candidates on Anthropic's notoriously difficult two-hour performance engineering take-home exam.
  5. Higher token efficiency with partners reporting up to 65% token reductions and fewer tool-calling errors on long-horizon coding tasks.
  6. Demonstrates industry-leading resistance to advanced prompt injection attacks based on Gray Swan evaluations.

Why it matters

While prior Opus models offered state-of-the-art reasoning, their high pricing limited widespread operational use. Opus 4.5 delivers higher autonomous problem-solving capabilities at a price point suitable for production-scale agentic workflows and heavy codebases.

Analysis

Anthropic focuses heavily on autonomous capabilities and token efficiency with Opus 4.5. Early partner feedback highlights that the model reaches solutions with fewer iterations, reducing overall operational costs despite its frontier status. The model also demonstrates nuanced rule interpretation and policy reasoning, illustrated by Anthropic using a creative solution in τ2-bench. With accompanying updates to Claude Code and developer tooling, Anthropic directly targets end-to-end software engineering and multi-step enterprise workflows.

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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  • Mattersburg
    Johann Nepomuk Bergerstraße 7/2/14
    7210 Mattersburg, Austria
  • Vienna
    Ungargasse 64-66/3/404
    1030 Wien, Austria

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