tech

December 3, 2025

Anthropic introduces cheaper, more powerful, more efficient Opus 4.5 model

Longer chats address a long-standing criticism of Claude.

Anthropic introduces cheaper, more powerful, more efficient Opus 4.5 model

TL;DR

  • Opus 4.5, Anthropic's new flagship model, enhances coding performance and user experience.
  • Consumer apps now feature improved conversation memory, preventing abrupt session endings by summarizing past interactions.
  • Opus 4.5 achieved 80.9% accuracy on the SWE-Bench Verified benchmark, surpassing GPT-5.1-Codex-Max and Gemini 3 Pro.
  • The model is claimed to be more resistant to prompt injection attacks.
  • Opus 4.5 demonstrates significantly improved token efficiency compared to previous models.
  • A new 'effort' parameter for developers allows tuning between efficacy and token usage.
  • Claude Code is now available in the desktop Claude apps.
  • API pricing for Opus 4.5 has been reduced significantly.

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