Gemini 3.8 Flash TTS speech and two-speaker dialogue

Turns

Ordered dialogue turns, each identifying a configured speakerOptional · turns

Style instructions

Delivery style, separate from the spoken transcriptOptional · style_instructions

Prompt

Verbatim text for single-speaker speechOptional · prompt

Voice

Prebuilt voice for single-speaker speechOptional · voice

Speakers

Exactly two distinct speaker aliases and their prebuilt voices for dialogueOptional · speakers

Price

$0.045 per 1,000 characters

Billing

The provider’s price, with no markup. Billed for measured usage.

Price checked

7 October 2026

Your agent reads the schema and the price with inspect_tool before it runs the tool.

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cURL command

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TypeScript

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Tool ID

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• ElevenLabs forced alignmentfal.ai$0.22/unit
• Gemini 3.8 Flash Lite TTS speech and two-speaker dialoguefal.ai$0.03/1,000 characters
• Grok voicefal.aiUsage based
• VEED clean audiofal.ai$0.0125/unit
• xAI text to speechfal.ai$0.015/1,000 characters
• Compare all 21