Anthropic Introduces ‘World’s Most Powerful Model’

Sector6  Nov 26. 2025 The bi-weekly newsletter by AIM that brings the biggest shifts shaping IT, AI, and GCCs. Anthropic Introduces 'World's Most Powerful Model' Anthropic is attempting something a bit unconventional at a time when the AI world is fixated with leaderboard races and X theatre. With Claude Opus 4.5, the company is not only staking a claim at the top in coding and agentic tasks, but also trying to steer the conversation towards what the next phase of AI work actually feels like for developers. Just like everyone else. By Mohit Pandey Claude Opus 4.5 arrived with a simple pitch. "It just gets it." That is how early testers inside the company described it, and Anthropic leaned into that line as if it were a manifesto. The claim is bold. On SWE-bench Verified, Opus 4.5 touched 80.9, and Gemini 3 Pro, fresh from Google's aggressive cross-platform push, sits at 76.2.  These are not small gaps.  The more interesting part, however, is that Anthropic is not calling this a win on synthetic tests. It keeps talking about performance on actual software engineering tasks, and even claims the model outperformed every human candidate in its internal performance engineering exam.  To be fair, the team carefully notes that the exam measures only speed and technique, not judgment. Still, the point is clear. Anthropic believes it has crossed a meaningful threshold. The community is trying to process this in real time. Dan Shipper, co-founder of Every, said, "It is THE BEST coding model we've ever used (and it's not close)."  A developer who goes by SoloDev on X said Opus 4.5 refactored his entire codebase and gave him something that looked elegant, even if it broke everything.  Another joked that Gemini 3 handles the frontend, Opus 4.5 handles the backend, and together you get a full-stack engineer.   Deedy Das from Menlo Ventures, one of Anthropic's investors, funnily added that he hasn't been enjoying the model. Claude has stopped insisting that he's "absolutely right". The model fixed his code on the first try, which he suggested came at a personal cost. Anthropic is rolling out an upgraded Plan Mode in Claude Code. It is shipping Excel integrations to more users, lifting usage caps and asking people to use Opus 4.5 for daily work. In other words, it is betting on depth over spectacle. What Happens to Google, OpenAI, Meta and Grok? Google, meanwhile, is staging one of its loudest comebacks in years.  Gemini 3 is the most ambitious system the company has released in a long time, and Salesforce CEO Marc Benioff's sudden embrace of it turned the rivalry into a prime-time moment. After just two hours of using Gemini 3, he declared he is "not going back" to ChatGPT, praising its pace and reasoning capabilities.  Whispers suggest Gemini 3.5 could kickstart the whole race again. The moves are designed to create pressure, and they are effective.  Then there's OpenAI co-founder Andrej Karpathy's 'LLM-Council', where models anonymously judge each other—an experiment that has set off new debates. OpenAI's GPT-5.1 came out on top, Gemini 3 followed, and Claude Sonnet, Anthropic's earlier model, finished at the bottom.  Karpathy himself questioned the rankings, calling Claude simply "too terse" for that particular task. The real plot twist sits with Anthropic. The company is building an infrastructure moat. It has committed $30 billion worth of Azure compute. NVIDIA and Microsoft are set to invest up to $15 billion. Amazon still remains the primary cloud partner.  The company is also building new data centres in Texas and New York, part of a $50 billion domestic compute strategy. This is not a startup sprinting from release to release. It looks like an institution trying to secure the future of its models. Meanwhile, Meta is considering Google's TPUs as a possible alternative to NVIDIA chips for its data centres by 2027. Maybe the next Llama model might actually be trained on Google's chips. All in all, Opus 4.5 arrives at this moment both as a spec bump and a signal. It is giving developers new controls like effort levels, and the competition a new reason to make a run for their money. And of course, Elon Musk couldn't resist chiming in. "Grok might do better with v4.20. We shall see," he said.  We shall indeed. 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