MAI-Transcribe-1.5 is Microsoft AI's in-house speech-to-text model, built for production transcription across 43 languages with automatic language detection and domain-specific "entity biasing." It posts a 2.4% Word Error Rate on the Artificial Analysis leaderboard, ranks #1 on the FLEURS multilingual benchmark, transcribes an hour of audio in under 15 seconds, and costs $0.36 per hour of audio through Microsoft Foundry.