India, Feb. 4 -- Shares of Indian IT companies are on track for their worst trading session in nearly six years, after Anthropic's new AI plugin tools threatened to upend the business model of the $283-billion outsourcing industry.

On Wednesday (4 February 2026), Nifty IT index fell as much as 6.90%, dragging down the benchmark NSE Nifty with itself. That's the steepest decline since at least March 2020, wiping out nearly Rs.2 lakh crore in market capitalisation of Tata Consultancy Services Ltd. to Infosys Ltd. and Wipro Ltd. TCS and Wipro fell as much as 5.8% and 3.9%, respectively, while Infosys was down 7.3%.

Anthropic has launched plug-ins for its Claude Cowork agent to automate tasks that IT firms do for their clients by deploying ...