Artificial intelligence startup Cohere Inc. is releasing a new AI model Thursday that it says performs competitively against rivals like OpenAI on certain “business-critical” tasks at a fraction of the cost — heightening the race among AI companies to win corporate customers. Cohere says its new model, called Command R+, will be the startup’s most powerful technology yet, following the release of another, smaller but less capable version last month. Cohere is focused on business customers, which...