Documentation Index
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Provider differences and generation parameters for the Voice Design API.
provider body parameter on POST /v2/voice_designs.
| Telnyx (Qwen3TTS) | Minimax | |
|---|---|---|
provider value | "telnyx" (default) | "minimax" |
| Generation parameters | Respected | Not supported |
| Languages | Auto, Chinese, English, Japanese, Korean, German, French, Russian, Portuguese, Spanish, Italian | Auto, Chinese, English, Japanese, Korean, German, French, Russian, Portuguese, Spanish, Italian |
| Prompt interpretation | Follows prompts closely | May interpret differently |
| When to use | Fine control over generation, consistent results across iterations | Try a different model’s interpretation of the same prompt |
POST /v2/voice_designs. Telnyx provider only — ignored when provider is "minimax".
| Body parameter | Default | Range | What it does |
|---|---|---|---|
temperature | 0.9 | 0–2 | Higher = more varied/creative output. Lower = more predictable. |
top_k | 50 | 1–1000 | Limits vocabulary at each generation step. Lower = more focused. |
top_p | 1.0 | 0–1 | Nucleus sampling cutoff. Lower = fewer token choices. |
repetition_penalty | 1.05 | 1–2 | Reduces repeated patterns in generated audio. |
max_new_tokens | 2048 | 100–4096 | Maximum tokens to generate. Affects output length. |
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