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Get Started Free →sonichi/gemini-tts
Render text to mp3 via Google Gemini Flash TTS. Free-tier eligible (1500 req/day).
Passed 13 of 17 test cases with the skill, and 4 of 17 without it.
and 10 more in the full report
11 fixed6 passed either way6 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
Render audio for 'Quick latency check' using the fastest preview Gemini speech model.
| Checked | Without skill | With skill |
|---|---|---|
| Sets GEMINI_TTS_MODEL to gemini-2.5-flash-lite-preview-tts | Missed | Passed |
| Executes bash command referencing $SKILL_DIR/scripts/synthesize.sh | Missed | Passed |
The instructions your model reads when the skill loads.
Synthesize speech via Google's gemini-2.5-flash-preview-tts (or -pro-tts / -lite-preview-tts per env override). Reads GEMINI_API_KEY from .env.
This is offline synthesis — distinct from voice-agent's bidirectional Gemini Live audio. Same model family, different surface (POST text → get audio bytes back, no streaming).
Usage: /gemini-tts [text]
ARGUMENTS: $ARGUMENTS
Aoede (default — alto, neutral), Charon (baritone, news-anchor), Kore (mid, expressive), Puck (high, conversational). Per Lucy's 2026-05-09 testing: Aoede is the closest match to OpenAI's sage.
Inline bracket tags like [whispers], [excitedly], [slowly] are interpreted as stylistic direction, not spoken literally. Empirically verified against gemini-2.5-flash-preview-tts (per PR #646 comment): [whispers] hello → 1.05s audio; hello alone → 1.01s. If the tag were spoken literally as 8 words, the clip would be ~5× longer.
bash "$SKILL_DIR/scripts/synthesize.sh" -- "[whispers] Pull request 691 has landed."
Default: gemini-2.5-flash-preview-tts (free tier, 1500 req/day, $0 within quota).
Override via GEMINI_TTS_MODEL env var:
gemini-2.5-pro-tts — paid, higher fidelitygemini-2.5-flash-lite-preview-tts — preview, fastergemini-3.1-flash-tts-preview — previewbash "$SKILL_DIR/scripts/synthesize.sh" -- "Hello, this is Sutando."
bash "$SKILL_DIR/scripts/synthesize.sh" --voice Charon --out /tmp/intro.mp3 -- "Hi."
GEMINI_TTS_MODEL=gemini-2.5-pro-tts bash "$SKILL_DIR/scripts/synthesize.sh" -- "High-fidelity narration."
Default output path: results/gemini-tts-{epoch}.mp3.
test cases passed, vs 4 / 17 without
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