OpenAI text-to-speech model optimized for quality. Generates speech via the /v1/audio/speech endpoint.
OffRail routes requests to the best providers that are able to handle your prompt size and parameters.
OpenAI text-to-speech model optimized for quality. Generates speech via the /v1/audio/speech endpoint. You can access it through OffRail's OpenAI-compatible API with automatic provider routing, fallback, and cost analytics.
Pricing for TTS-1 HD on OffRail starts at $0.00 per million input tokens and $0.00 per million output tokens, depending on the provider. The pricing table above always reflects the current per-provider rates.
TTS-1 HD supports a context window of up to 4,096 tokens on its largest provider deployment.
TTS-1 HD is served by OpenAI through OffRail. Requests are automatically routed to the best available provider, with fallback when a provider has issues.
No. TTS-1 HD does not currently support tool calling or structured JSON outputs through OffRail.
TTS-1 HD was released on November 6, 2023.
GPT-5.6 Sol
1,050,000 context$5.00 in / $30.00 out per 1M
GPT-5.6 Terra
1,050,000 context$2.00 in / $12.00 out per 1M
GPT-5.6 Luna
1,050,000 context$0.20 in / $1.20 out per 1M
GPT Realtime 2.1
128,000 context$4.00 in / $24.00 out per 1M
GPT Realtime 2.1 Mini
128,000 context$0.60 in / $2.40 out per 1M
GPT-5.5
1,050,000 context$5.00 in / $30.00 out per 1M