Pronunciation Robustness measures whether Text to Speech models correctly pronounce challenging text across four categories, with human reviewers judging each clip against pre-agreed accepted pronunciations.

➤ Expanding Shorthand: Eleven v4 Turbo ranks #2 at 91.9%, behind Eleven v4 at 94.1% and ahead of Gemini 3.8 Flash TTS at 86.1%.

➤ Contextually Appropriate: Eleven v4 Turbo scores 95.8%, ahead of Eleven v4 at 94.1%, with Gemini 3.8 Flash TTS leading at 97.9%.

➤ Standalone Terms: Eleven v4 Turbo scores 91.4%, with Eleven v3 Conversational leading at 95.1%.

➤ Preserving Exact Sequences: Eleven v4 Turbo scores 73.9%, ahead of Eleven v3 at 71.2%, with SpaceXAI TTS leading at 85.7%.