inworld
Inworld TTS API. Covers voice cloning, audio markups, timestamps. Use when integrating Inworld text-to-speech, cloning voices, adding audio markups (SSML-like), or aligning viseme timestamps. Keywords: Inworld, text-to-speech, TTS, voice cloning, visemes.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/itechmeat/llm-code --skill inworld- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads inworld automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Inworld AI
Text-to-Speech platform with voice cloning, audio markups, and timestamp alignment.
Quick Navigation
| Topic | Reference |
|---|---|
| Installation | installation.md |
| Voice Cloning | cloning.md |
| Voice Control | voice-control.md |
| API Reference | api.md |
When to Use
- Text-to-speech audio generation
- Voice cloning from 5-15 seconds of audio
- Emotion-controlled speech (
[happy],[sad], etc.) - Word/phoneme timestamps for lip sync
- Custom pronunciation with IPA
Models
| Model | ID | Latency | Price |
|---|---|---|---|
| TTS-2 Flash | inworld-tts-2-flash | lowest | see pricing |
| TTS-2 | inworld-tts-2 | latest | see pricing |
| TTS 1.5 Max | inworld-tts-1.5-max | legacy | legacy |
| TTS 1.5 Mini | inworld-tts-1.5-mini | legacy | legacy |
Minimal Example
import requests, base64, os
response = requests.post(
"https://api.inworld.ai/tts/v1/voice",
headers={"Authorization": f"Basic {os.getenv('INWORLD_API_KEY')}"},
json={"text": "Hello!", "voiceId": "Ashley", "modelId": "inworld-tts-1.5-max"}
)
audio = base64.b64decode(response.json()['audioContent'])
Key Features
- 15 languages — en, zh, ja, ko, ru, it, es, pt, fr, de, pl, nl, hi, he, ar
- Instant cloning — 5-15 seconds audio, no training
- Audio markups —
[happy],[laughing],[sigh](English only) - Timestamps — word, phoneme, viseme timing for lip sync
- Streaming —
/voice:streamendpoint - TTS-2 steering — natural-language bracketed directions such as
[say excitedly]or[whisper in a hushed style] - Delivery mode —
STABLE,BALANCED,CREATIVEtrade consistency for emotional range - Cross-lingual synthesis — reuse one voice across multiple languages; voice localization improves native-sounding output
Release Highlights (TTS-2)
Realtime TTS-2becomes the new primary model line viamodelId="inworld-tts-2".- Steering moves beyond the older fixed emotion tags: free-form bracketed directions can control style, pitch, speed, intensity, and non-verbals.
- Multilingual coverage expands with production quality across 15 languages and broader experimental coverage beyond that.
deliveryModeadds a stability-vs-creativity knob, and specifyinglanguagematters more for cross-lingual output quality.
Release Updates (August 2026)
- New
inworld-tts-2-flashmodel: lowest latency and cost, full language coverage, instant voice cloning, and timestamp alignment. Steering and Professional Voice Cloning remain exclusive toinworld-tts-2. - Steering instructions now persist until explicitly changed: a reserved
[reset]tag ends a styled passage, and a<break/>pause no longer clears the active instruction. A request-levelinstructionfield on Synthesize Speech is an alternative to inline tags. - Cross-lingual voice synthesis and voice localization improve native-sounding output when one voice is reused across languages.
Prohibitions
- Audio markups work only in English
- Use ONE emotion markup at text beginning
- Match voice language to text language
- Instant cloning may not work for children's voices or unique accents
Links
FAQ
What does the inworld skill do?
Inworld TTS API. Covers voice cloning, audio markups, timestamps. Use when integrating Inworld text-to-speech, cloning voices, adding audio markups (SSML-like), or aligning viseme timestamps. Keywords: Inworld, text-to-speech, TTS, voice cloning, visemes.
How do I install inworld?
Run npx skills add https://github.com/itechmeat/llm-code --skill inworld in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/inworld/ (personal) or .claude/skills/inworld/ (project).
Which AI agents can use inworld?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is inworld safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains inworld?
It is published by itechmeat in itechmeat/llm-code. It has 59 recorded installs.
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