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Gemini 3.8 Flash TTS

google/gemini-3.8-flash-tts

Gemini 3.8 Flash TTS by Google turns text into expressive speech with 30 prebuilt voices and natural-language style direction.

Use in agentGet API key
Base price
$0.04USD / run
Execution
async
Model type
audio
Input fields
3
Production route

Try the model

Playground

Open playground
Input
Verbatim text to speak. Put delivery directions in style_instructions; inline vocal events may use <laugh> or <sigh>. The provider limits the complete input to 8,192 tokens.
Delivery style, separate from the spoken transcript.
Prebuilt voice for single-speaker speech. Allowed values: Achernar, Achird, Algenib, Algieba, Alnilam, Aoede, Autonoe, Callirrhoe, Charon, Despina, Enceladus, Erinome, Fenrir, Gacrux, Iapetus, Kore, Laomedeia, Leda, Orus, Pulcherrima, Puck, Rasalgethi, Sadachbia, Sadaltager, Schedar, Sulafat, Umbriel, Vindemiatrix, Zephyr, Zubenelgenubi.
OutputExample
  1. Open original

Examples

Select an example to load its inputs and result into the playground.

Model card

Specifications

Pricing

Base price
$0.04 / run

Context & modalities

Input
Schema-defined
Output
audio

Capabilities

Chat
Not supported
Vision
Not supported
Reasoning
Not supported
Structured output
Not supported
Function calling
Not supported
Audio input
Not supported

Access

Provider
Google
Model ID
google/gemini-3.8-flash-tts
Execution
async
API
Unified Run API
Endpoint
/v1/run

API README

Gemini 3.8 Flash TTS

Gemini 3.8 Flash TTS by Google turns text into expressive speech with 30 prebuilt voices and natural-language style direction. Inline vocal events such as <laugh> and <sigh> are supported; output is WAV. This endpoint supports single-speaker speech; style instructions are not billed.

Pricing

OptionPrice
Each started block of 1,000 spoken characters$0.045

Start building

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

Production API
Unified Run API endpoint
https://api.sandbase.ai/v1/run
Model ID
google/gemini-3.8-flash-tts
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/run" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "google/gemini-3.8-flash-tts",
  "voice": "Kore",
  "prompt": "Have a wonderful day!",
  "style_instructions": "cheerful and friendly"
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
  status=$(printf '%s' "$result" | jq -r .status)
  case "$status" in completed|failed|timeout) break ;; esac
  sleep 2
  result=$(curl --fail-with-body --silent \
    -H "Authorization: Bearer $SANDBASE_API_KEY" \
    "https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"

Choose your model

Compare models

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Questions

FAQ

How do I call Google Gemini 3.8 Flash TTS through SandBase?

Create a SandBase API key, then send requests with the model ID "google/gemini-3.8-flash-tts" to Unified Run API (/v1/run) at https://api.sandbase.ai. The request examples on this page show the exact payload.

Do I need a separate Google account?

No. One SandBase API key and balance gives you access to Google Gemini 3.8 Flash TTS and the other models in the catalog; you do not need to sign up with Google separately.