A revamped Siri is at the core of Apple’s AI strategy.Photographer: Hollie Adams/BloombergApple Inc. is planning to launch its own artificial intelligence-powered web search tool next year, stepping up competition with OpenAI and Perplexity AI Inc.The company is working on a new system — dubbed internally as World Knowledge Answers — that will be integrated into the Siri voice assistant, according to people with knowledge of the matter. Apple has discussed also eventually adding the technology t...