gemini-tts

Generate multi-speaker speech with Gemini TTS through RunAPI. Use when the user asks an agent to synthesize dialogue or integrate Gemini TTS. Use the RunAPI CLI for one-off generation and the language SDK for application integration.

Gemini TTS on RunAPI

Generate ordered multi-speaker dialogue with configurable voices, accents, styles, pacing, scene context, and sampling temperature.

Critical: Integration Runtime

• Integration work (app, backend, worker, library, Rails service, Node service, Go service, webhook pipeline, or production codebase) uses the SDK integration path for the target language.
• One-off generation, manual smoke tests, debugging, and user-requested command runs use the CLI path with the runapi binary. For full CLI-specific agent guidance, see https://github.com/runapi-ai/cli-skill.
• Never shell out to the runapi CLI as the production runtime integration layer.

SDK integration path

When integrating Gemini TTS into an app, backend, worker, library, Rails service, Node service, Go service, webhook pipeline, or production workflow, start by checking the current SDK package and official usage. Confirm install commands, client methods (create, get, run), request fields, response shape, and error classes before using CLI help or raw HTTP examples. Use a RunAPI SDK package:

SDK packages:

• JavaScript / TypeScript: @runapi.ai/gemini-tts
• Python: runapi-gemini-tts
• Ruby: runapi-gemini-tts
• Go: github.com/runapi-ai/gemini-tts-sdk/go
• Java: ai.runapi:runapi-gemini-tts
• PHP: runapi-ai/gemini-tts

Variants

• Gemini 2.5 Pro TTS: use gemini-2.5-pro-tts.
• Gemini 3.1 Flash TTS: use gemini-3.1-flash-tts.

Both variants accept the same speaker and dialogue request structure.

CLI path

The runapi binary is the one-off and manual testing runtime dependency. For full CLI-specific agent guidance, see https://github.com/runapi-ai/cli-skill. Check authentication and inspect the current request schema:

shell

runapi auth status
runapi gemini-tts text-to-speech --help

Run from a JSON request file:

shell

runapi gemini-tts text-to-speech --input-file request.json

Submit without waiting and poll separately:

shell

runapi gemini-tts text-to-speech --async --input-file request.json
runapi wait <task-id> --service gemini-tts --action text-to-speech

Each dialogue_turns[].speaker_id must match a configured speakers[].speaker_id in Speaker N format. Keep secrets in RUNAPI_API_KEY or saved CLI config.

References

• Model overview, pricing, and rate limits: https://runapi.ai/models/gemini-tts.md
• Provider comparison: https://runapi.ai/providers/google.md
• Full model catalog: https://runapi.ai/models.md