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Anthropic releases Claude Opus 5.5, beating Fable 5.1 on key agentic benchmarks at 60 ...
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Fusion42 · 22 September 2026 · Fusion42 review
Anthropic has released Claude Opus 5.5, a cutting-edge AI model that outperforms its predecessor Fable 5.1 on key coding and knowledge work benchmarks while reducing costs by approximately 20-40%. The model offers significantly better cost efficiency compared to other frontier AI models, positioning it strongly in the AI API market.
This Wire brief sits within Fusion42's coverage of AI Frontier Models, and 2 sources have reported it between 22 Sep 2026 and 23 Sep 2026.
◆ ◆ The Wire takeaway
You have an opening to cut your AI agent costs by up to 40% with Claude Opus 5.5 without losing performance. If your product relies on agentic AI, switching now could improve margins and competitive positioning.
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2 sources · first reported 22 Sep 2026 · latest 23 Sep 2026
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