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WaveSpeedText to speechComing soon

google/gemini-3.8-flash/text-to-speech

google/gemini-3.8-flash/text-to-speech is a text to speech tool from WaveSpeed that runs in the background and returns audio. Coming soon: listed with its price, not yet open to runs.

This tool is listed but not yet available to run.

Price pending

Pricing

Price pending.

Limits

Runs
In the background
Returns
audio
Longest queue wait
3600s
Run deadline
1800s
Largest inline input
1024 KB
Largest input file
500 MB
Largest output
4768 MB
Outputs per run
16

Input

FieldKindDefaultDescription
texttext—Text to speak. For dialogue, leave text empty and provide speakers and turns. Delivery directions belong in style_instructions.
turnsJSON—Optional dialogue turns: add at least one turn and match each speaker_id to the two configured speakers. Leave text empty when using dialogue. Total input must fit 8192 tokens.
voiceone of
Achernar, Achird, Algenib, Algieba, Alnilam, Aoede, Autonoe, Callirrhoe, Charon, Despina, Enceladus, Erinome, Fenrir, Gacrux, Iapetus, Kore, Laomedeia, Leda, Orus, Puck, Pulcherrima, Rasalgethi, Sadachbia, Sadaltager, Schedar, Sulafat, Umbriel, Vindemiatrix, Zephyr, Zubenelgenubi
KorePrebuilt voice for single-speaker speech.
speakersJSON—Optional dialogue setup: add exactly two distinct speaker IDs and their voices, then add turns and leave text empty. Omit for single-speaker speech.
style_instructionstext—Optional delivery style, tone, pacing, or accent. Included in billable character count.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "wavespeed",
    "model": "google/gemini-3.8-flash/text-to-speech",
    "input": {}
  }'