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TTS-2 Flash

by Inworld · Released Undisclosed

The faster, lower-cost Inworld TTS-2. Same 14 voices and 94 languages including 11 Indian languages. Voice sessions only. $0.1563 per 10K characters.

Text to Speech

TTS-2 Flash

Powered by Inworld · Streaming neural TTS (Inworld TTS-2 Flash)

Context Window

N/A

Parameters

Undisclosed

Max Output

N/A

Category

Text to Speech

Overview

TTS-2 Flash is the faster, lower-cost variant of Inworld's TTS-2. It has the same 14 voices and the same 94 languages, including Hindi, Marathi, Bengali, Tamil, Telugu, Gujarati, Kannada, Malayalam, Punjabi, Urdu and Odia. On CallMissed it runs inside voice agents and voice sessions only.

The default voice is riya. Speaking rate and expressiveness (temperature) are adjustable per agent.

It performs non-verbal sounds (laugh, sigh, breathe, clear throat, cough) and SSML pauses, but ignores delivery directions. POST /v1/audio/speech returns an error for it. Choose inworld-tts-2 when you want the full model at a slightly higher price.

Pricing

MetricPrice
Price /10K chars₹15.0000

1 credit = ₹1 ≈ US$0.0104 (US$1 = ₹96). Transparent per-call pricing — you pay only for what you call, with no seat fees or minimums.

Key Highlights

  • Faster, lower-cost TTS-2 with the same voices and languages
  • 94 languages including 11 Indian languages
  • 14 voices; default riya
  • Voice sessions only — not available on the speech endpoint

Benchmarks

BenchmarkScore
Languages94
Voices14
Price$0.1563
DeploymentVoice sessions only

Technical Details

  • 94 base language codes; every voice speaks every code
  • 14 voices; gender and description are listed only where Inworld publishes them
  • Speaking rate and expressiveness adjustable per agent
  • Non-verbal sounds and SSML pauses; no delivery directions
  • Voice sessions only — POST /v1/audio/speech returns 400 for this model

Strengths

  • Among the lowest-priced voice-session TTS models
  • 94 languages including 11 Indian languages
  • Same voices as inworld-tts-2

Limitations

  • Voice descriptions and gender are missing for some voices
  • Voice sessions only — not available on the speech endpoint

Use Cases

High-volume Indian-language voice agentsCost-sensitive multilingual callingLatency-sensitive conversations

API Example

curl https://api.callmissed.com/v1/voice/sessions \
  -H "Authorization: Bearer cm_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tts_model": "inworld-tts-2-flash",
    "voice": "riya",
    "language": "hi"
  }'

Endpoint: POST /v1/voice/sessions (voice sessions only) · Model ID: inworld-tts-2-flash

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