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OpenAI TTS-1 HD

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openai/tts-1-hd · by OpenAI · neural-tts

Pricing — 1 offering(s)

OpenAI (Audio)

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  • $30.00 / 1M characters Current 2023-11-06 → present
    SCO-608 re-verification: unchanged at $30/1M characters. openai.com/api/pricing/ 403s to automated fetches…

    SCO-608 re-verification: unchanged at $30/1M characters. openai.com/api/pricing/ 403s to automated fetches (Cloudflare bot check, not dead); confirmed instead via developers.openai.com/api/docs/pricing, which lists the same figure. SCO-617: citation URL itself updated to match — the old URL now redirects to an unrelated ChatGPT Business seat-pricing page.

Showing the active price and any recorded history. Full pricing history is available via the paid API — see API docs.

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Capability profile

How OpenAI TTS-1 HD rates across core capability dimensions, with the task-level evidence behind each rating.

voice naturalness Strong

Noticeably higher audio fidelity than TTS-1. Better prosody and less metallic quality. FILLED 2026-08-19 (SCO-462 sweep, was "no independently published MOS"): the Artificial Analysis Text to Speech Arena (artificialanalysis.ai/text-to-speech/leaderboard/provider-voice) ranks "TTS-1 HD" #30 of 98 voices tracked, Elo 1108 — mid-table, ahead of TTS-1 itself (#34, Elo 1094; see tts-1.yaml).

language support Strong

Same 57-language support as TTS-1.

voice variety Weak

Same 6 preset voices as TTS-1; no cloning or custom voices.

streaming latency Moderate

Slightly higher latency than TTS-1 due to higher fidelity processing.

cloning support Weak

No voice cloning, no fine-tuning, no SSML. Same limitations as TTS-1.

Benchmarks

Benchmark Score Config Source
MOS (naturalness) — No independently published MOS. Vendor-described as higher fidelity than TTS-1; community rates it between TTS-1 and ElevenLabs Multilingual v2. —

Operator guidance

Choose TTS-1 HD when output quality is more important than cost — the 2× price premium is justified for final production audio. For real-time apps and volume workloads, TTS-1 is sufficient. ElevenLabs Multilingual v2 exceeds TTS-1 HD in naturalness but costs 4× more.

Use cases

Limitations

Citations