Anthropic has introduced its latest artificial intelligence model, Claude Sonnet 4.5, which it describes as the “best coding model in the world.” The new release is designed to improve coding, computer use and business problem-solving while also advancing specialised fields such as cybersecurity, finance and research.
According to the company, Claude Sonnet 4.5 can build “production-ready” applications rather than just prototypes, marking a major step forward in reliability compared with earlier models. It also leads on several coding benchmarks, including SWE-Bench Verified. Anthropic highlighted that the model’s safety training has reduced risks of undesirable behaviours such as sycophancy, deception and power-seeking, while also defending against prompt injection attacks.
Claude Sonnet 4.5 is capable of running autonomously for up to 30 hours on complex, multi-step tasks, a significant leap from Claude Opus 4, launched in May, which managed only seven hours. The new model generates higher-quality code, identifies improvements more effectively and follows instructions with greater accuracy.
The model is available to all users through the Claude API and Claude chatbot at the same pricing as its predecessor: 3 dollars per million input tokens and 15 dollars per million output tokens.
Anthropic has been aggressively expanding its AI portfolio, releasing new models every few months. The company, founded in 2021 by former OpenAI researchers, is now valued at 183 billion dollars and counts over 300,000 customers, up from just 1,000 two years ago. Its revenue run-rate has surged to more than 5 billion dollars, compared with around 1 billion dollars at the beginning of the year.
The launch follows OpenAI’s release of GPT-5 in August, intensifying competition in the AI coding space. Both companies are driving the rise of “vibe coding,” a term popularised in Silicon Valley to describe coding with AI assistance, allowing even non-technical users to build functional apps and websites.
Anthropic is also expanding globally, opening its first Asia office in Tokyo and scaling operations across Europe with new hubs in Dublin, London and Zurich. It is also planning to recruit country leads for India, Australia, New Zealand, South Korea and Singapore, while strengthening its presence in the UK, Germany, Austria and Switzerland.
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