OpenAI's TTS-HD is the safe, integrated choice for shops already on OpenAI. The 11-voice library is small but each voice is well-trained and emotionally coherent.
At $0.003/character it's significantly cheaper than ElevenLabs, with no separate billing relationship needed if you're already an OpenAI customer.
The trade-off: no voice cloning, no per-voice fine-tuning, and a notably narrower expressive range. For scripted narration this is fine. For character work or branded voices, look elsewhere.
Verdict: the easy default for OpenAI-native stacks. 8.2/10.