Dario Amodei, co-founder and chief executive officer of Anthropic. (Image credit: TechCrunch)
Anthropic on Tuesday announced its latest artificial intelligence model: Claude Sonnet 4.5, which it claims is the “best coding model in the world.” The new model is better at coding, using computers, and meeting practical business needs. It also excels in specialised fields such as cybersecurity, finance, and research.
The company said Claude Sonnet 4.5 is capable of building “production-ready” applications, rather than just prototypes, a major leap in reliability from its previous AI models. The new model offers industry-leading performance on several coding benchmarks, including SWE-Bench Verified.
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“Claude Sonnet 4.5 is our most aligned frontier model yet. Claude’s improved capabilities and our extensive safety training have allowed us to substantially improve the model’s behavior, reducing concerning behaviors like sycophancy, deception, power-seeking, and the tendency to encourage delusional thinking. For the model’s agentic and computer use capabilities, we’ve also made considerable progress on defending against prompt injection attacks, one of the most serious risks for users of these capabilities,” the company said in a blog post.
Anthropic has been aggressive lately, launching a new AI model every few months. Its Claude Opus 4.1 was launched in August, and Claude Sonnet 4 in May.
Claude Sonnet 4.5 can run autonomously for 30 hours, and Anthropic says it is capable of maintaining focus on complex, multistep tasks throughout that period. Think of it as your AI coworker. In comparison, Claude Opus 4, which the company launched in May, could run autonomously for only seven hours.
The model generates higher-quality code, is better at identifying code improvements and can follow instructions more reliably.
Claude Sonnet 4.5 will be available to all users via the Claude API and the Claude chatbot. Pricing for developers remains the same as for Claude Sonnet 4: $3 per million input tokens and $15 per million output tokens.
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Anthropic was founded by a group of former OpenAI researchers in 2021, and the two companies are fierce competitors in the AI market. The Amazon-backed startup is currently valued at $183 billion. The company’s valuation has been on a steep climb since it announced its AI assistant Claude in March 2023.
The release of Claude Sonnet 4.5 follows OpenAI’s launch of GPT-5 in August, which is also designed to be more capable at coding. Both AI darlings are racing to capture the attention of enterprise customers, who are increasingly relying on AI for software development, subsequently giving rise to vibe coding.
A buzzy new phrase, vibe coding has captured the attention of Silicon Valley and the tech industry at large after being coined by Andrej Karpathy, a co-founder of OpenAI. Vibe coding is essentially coding with the help of artificial intelligence. With the help of AI-powered code generation tools, it is now possible for non-technical users – even those without any software engineering experience to create functional apps and websites.
The San Franscisco-based AI hesavywieght, Anthropic has over 300,000 customers in just two years, up from 1000, as demand for AI creation reaches different sectors and markets.
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Following in the footsteps of OpenAI, Anthropic is opening its first Asia office in Tokyo and scaling operations across Europe, including more than 100 new roles in Dublin and London, as well as a research-focused hub in Zurich. The company is also set to recruit country leads for India, Australia and New Zealand, South Korea, and Singapore, with broader expansion underway across the UK, Northern and Southern Europe, Germany, Austria, and Switzerland, according to CNBC.
Anthropic said its run-rate revenue has reached more than $5 billion, up from roughly $1 billion at the beginning of the year.
Anuj Bhatia is a seasoned personal technology writer at indianexpress.com with a career spanning over a decade. Active in the domain since 2011, he has established himself as a distinct voice in tech journalism, specializing in long-form narratives that bridge the gap between complex innovation and consumer lifestyle.
Experience & Career: Anuj has been a key contributor to The Indian Express since late 2016. Prior to his current tenure, he served as a Senior Tech Writer at My Mobile magazine and held a role as a reviewer and tech writer at Gizbot. His professional trajectory reflects a rigorous commitment to technology reporting, backed by a postgraduate degree from Banaras Hindu University.
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