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Gemini API speech APIs - verified

Gemini API speech API pricing and models

Google (Gemini API): 2 speech-to-text models, 5 text-to-speech models and 1 realtime voice model, read from the provider's own pages on October 18, 2026. 3 models are scheduled to retire: gemini-3.1-flash-tts-preview on November 17, 2026, gemini-2.5-flash-preview-tts on November 17, 2026 and gemini-2.5-pro-preview-tts on November 17, 2026.

Read from ai.google.dev. Compare every speech API

Speech-to-text
2
Text-to-speech
5
Realtime voice
1
Retiring
3

Gemini 3.5 Transcribe

Speech-to-text - gemini-3.5-transcribe

Current
Price (provider's unit)

$2.00 per 1M audio input tokens ($0.003/min); $12.00 per 1M text output tokens ($0.002/min)

“| Input price | Free of charge | $2.00 or $0.003/min* (audio) | | Output price (including thinking tokens) | Free of charge | $12.00 or $0.002/min* (text) |”
ai.google.dev
Converted $/hour (our arithmetic)
Not convertedPriced per token
Languages

85+ languages

“| Language Auto-detection | Supported (85+ languages) | Supported (85+ languages) | Includes mid-session code-mixing. |”
ai.google.dev
Streaming

No

“For real-time, low-latency streaming transcription over WebSockets, visit the Live transcription guide using gemini-3.5-transcribe-live.”
ai.google.dev
Max audio

1 hour per request (30 minutes with diarization or word timestamps)

“Up to 1 hour per request (up to 30 minutes when speaker diarization or word-level timestamps are enabled)”
ai.google.dev
Status

stable (no shutdown date)

“| gemini-3.5-transcribe | August 2026 | No shutdown date announced |”
ai.google.dev

Features

  • speaker diarization (up to 8 speakers)

    “| Speaker Diarization | Not Supported | Supported (up to 8 speakers) |”
    ai.google.dev
  • word-level timestamps

    “| Word-level Timestamps | Not Supported | Supported |”
    ai.google.dev
  • custom vocabulary (up to 1,000 terms)

    “| Custom Vocabulary Biasing | Supported (up to 1,000 terms) | Supported (up to 1,000 terms) |”
    ai.google.dev

Google states an effective blended rate of ~$0.005 per min (25 audio tokens per second, 175 text tokens per minute).

Gemini 3.5 Transcribe Live

Speech-to-text - gemini-3.5-transcribe-live

Current
Price (provider's unit)

$3.50 per 1M audio input tokens ($0.005/min); $21.00 per 1M text output tokens ($0.004/min)

“| Input price | Free of charge | $3.50 or $0.005/min* (audio) | | Output price (including thinking tokens) | Free of charge | $21.00 or $0.004/min* (text) |”
ai.google.dev
Converted $/hour (our arithmetic)
Not convertedPriced per token
Languages

85+ languages

“| Language Auto-detection | Supported (85+ languages) | Supported (85+ languages) |”
ai.google.dev
Streaming

Yes

“Our low-latency, real-time speech-to-text model for bidirectional streaming audio transcription over WebSockets.”
ai.google.dev
Max audio

10 minutes per session

“| Max Audio Duration | 10 minutes per session. | Up to 1 hour |”
ai.google.dev
Status

stable (no shutdown date)

“| gemini-3.5-transcribe-live | August 2026 | No shutdown date announced |”
ai.google.dev

Features

  • no diarization or word timestamps in live mode

    “| Speaker Diarization | Not Supported | Supported (up to 8 speakers) |”
    ai.google.dev

Google states an effective blended rate of ~$0.009 per min for Live Transcribe.

Gemini 3.8 Flash TTS

Text-to-speech - gemini-3.8-flash-tts

Current
Price (provider's unit)

$0.50 per 1M text input tokens; $9.00 per 1M audio output tokens through December 31, 2026 ($1.00 / $18.00 starting January 1, 2027)

“Input price | Free of charge | $0.50 (text) through December 31, 2026. $1.00 (text) starting January 1, 2027. | | Output price | Free of charge | $9.00 (audio) through December 31, 2026. $18.00 (audio) starting January 1, 2027.”
ai.google.dev
Languages

over 130 languages

“Gemini 3.8 Flash TTS (gemini-3.8-flash-tts) supports over 130 languages”
ai.google.dev
Streaming

Yes

“Gemini 3.8 TTS models use different default audio formats depending on whether the request is unary or streaming”
ai.google.dev
Limit per request

8,192 input tokens / 16,384 output tokens

“Input token limit 8,192 Output token limit 16,384 (Gemini API serving limit)”
ai.google.dev
Status

stable on Gemini API (no shutdown date)

“| gemini-3.8-flash-tts | September 22, 2026 | No shutdown date announced |”
ai.google.dev

Features

  • multi-speaker

    “This guide shows you how to generate single-speaker and multi-speaker audio from text using Gemini 3.8 Flash TTS (gemini-3.8-flash-tts) and Gemini 3.8 Flash-Lite TTS (gemini-3.8-flash-lite-tts).”
    ai.google.dev
  • voice design and voice replication

    “You can choose a voice from the prebuilt Voice options, the Extended Voice Library (GET /v1beta/voices), a custom Voice design ID (voice_...), or a Voice replication ID (voice_..., or optional stateless voicekey_...).”
    ai.google.dev

Audio tokens are 25 per second. Batch/Flex: $0.25 / $4.50 per 1M through 2026. Google Cloud's Text-to-Speech pricing page labels this model 'Gemini 3.8 Flash TTS (Preview)'.

Gemini 3.8 Flash-Lite TTS

Text-to-speech - gemini-3.8-flash-lite-tts

Current
Price (provider's unit)

$0.50 per 1M text input tokens; $6.00 per 1M audio output tokens through December 31, 2026 ($1.00 / $12.00 starting January 1, 2027)

“Input price | Free of charge | $0.50 (text) through December 31, 2026. $1.00 (text) starting January 1, 2027. | | Output price | Free of charge | $6.00 (audio) through December 31, 2026. $12.00 (audio) starting January 1, 2027.”
ai.google.dev
Languages

over 100 languages

“Gemini 3.8 Flash-Lite TTS (gemini-3.8-flash-lite-tts) supports over 100 languages”
ai.google.dev
Streaming

Yes

“Gemini 3.8 TTS models use different default audio formats depending on whether the request is unary or streaming”
ai.google.dev
Limit per request
Not stated
Status

stable on Gemini API (no shutdown date)

“| gemini-3.8-flash-lite-tts | September 22, 2026 | No shutdown date announced |”
ai.google.dev

Features

  • multi-speaker

    “This guide shows you how to generate single-speaker and multi-speaker audio from text using Gemini 3.8 Flash TTS (gemini-3.8-flash-tts) and Gemini 3.8 Flash-Lite TTS (gemini-3.8-flash-lite-tts).”
    ai.google.dev
  • voice design and voice replication

    “You can choose a voice from the prebuilt Voice options, the Extended Voice Library (GET /v1beta/voices), a custom Voice design ID (voice_...), or a Voice replication ID (voice_..., or optional stateless voicekey_...).”
    ai.google.dev

Batch/Flex: $0.25 / $3.00 per 1M through 2026. The 3.8 Flash TTS model page states '101 languages' for Flash-Lite. Google Cloud labels it Preview.

Gemini 3.1 Flash TTS Preview

Text-to-speech - gemini-3.1-flash-tts-preview

Retiring 2026-11-17
Price (provider's unit)

$1.00 per 1M text input tokens; $20.00 per 1M audio output tokens

“| Input price | Free of charge | $1.00 (text) | | Output price | Free of charge | $20.00 (audio) |”
ai.google.dev
Languages
Not stated
Streaming
Not stated
Limit per request
Not stated
Status

preview, retiring 2026-11-17

“| gemini-3.1-flash-tts-preview | February 26, 2026 | November 17, 2026 | gemini-3.8-flash-tts or gemini-3.8-flash-lite-tts |”
ai.google.dev

RETIRES 2026-11-17. Batch: $0.50 / $10.00 per 1M. The speech-generation Supported models table marks single-speaker and multi-speaker as supported, and voice design and voice replication as not supported.

Gemini 2.5 Flash Preview TTS

Text-to-speech - gemini-2.5-flash-preview-tts

Retiring 2026-11-17
Price (provider's unit)

$0.50 per 1M text input tokens; $10.00 per 1M audio output tokens

“| Input price | Free of charge | $0.50 (text) | | Output price | Free of charge | $10.00 (audio) |”
ai.google.dev
Languages
Not stated
Streaming
Not stated
Limit per request
Not stated
Status

preview, retiring 2026-11-17

“| gemini-2.5-flash-preview-tts | May 20, 2025 | November 17, 2026 | gemini-3.8-flash-tts or gemini-3.8-flash-lite-tts |”
ai.google.dev

RETIRES 2026-11-17. Batch: $0.25 / $5.00 per 1M.

Gemini 2.5 Pro Preview TTS

Text-to-speech - gemini-2.5-pro-preview-tts

Retiring 2026-11-17
Price (provider's unit)

$1.00 per 1M text input tokens; $20.00 per 1M audio output tokens

“| Input price | Not available | $1.00 (text) | | Output price | Not available | $20.00 (audio) |”
ai.google.dev
Languages
Not stated
Streaming
Not stated
Limit per request
Not stated
Status

preview, retiring 2026-11-17

“| gemini-2.5-pro-preview-tts | May 20, 2025 | November 17, 2026 | gemini-3.8-flash-tts or gemini-3.8-flash-lite-tts |”
ai.google.dev

RETIRES 2026-11-17. No free tier. Batch: $0.50 / $10.00 per 1M. The speech-generation Supported models table marks single-speaker and multi-speaker as supported, and voice design and voice replication as not supported.

Gemini 3.8 Live

Realtime voice - gemini-3.8-live

Current
Price (provider's unit)

$3.00 per 1M audio input tokens ($0.005/min); $12.00 per 1M audio output tokens ($0.018/min)

“| Input price | Free of charge | $0.75 (text) $3.00 or $0.005/min (audio) $1.00 or $0.002/min (image/video) | | Output price (including thinking tokens) | Free of charge | $4.50 (text) $12.00 or $0.018/min (audio) |”
ai.google.dev
Languages
Not stated
Streaming

Yes

“Our low-latency, audio-to-audio models optimized for real-time voice agents and live dialogue”
ai.google.dev
Limits

131,072 input tokens / 65,536 output tokens

“Input token limit 131,072 Output token limit 65,536”
ai.google.dev
Status

stable

“- Stable: gemini-3.8-live”
ai.google.dev

Features

  • asynchronous function calling, interleaved reasoning

    “It supports interleaved reasoning, asynchronous function calling, full session client content updates, and built-in audio streaming.”
    ai.google.dev

The same price table covers gemini-3.8-live-extended-thinking and gemini-3.1-flash-live-preview. gemini-3.1-flash-live-preview and gemini-2.5-flash-native-audio-preview-12-2025 retire 2026-11-17 (replacement gemini-3.8-live). gemini-2.5-flash-native-audio-preview-12-2025 is priced $3.00 audio in / $12.00 audio out per 1M.

FAQ

How much does Gemini API speech-to-text cost?

Gemini 3.5 Transcribe: $2.00 per 1M audio input tokens ($0.003/min); $12.00 per 1M text output tokens ($0.002/min). Gemini 3.5 Transcribe Live: $3.50 per 1M audio input tokens ($0.005/min); $21.00 per 1M text output tokens ($0.004/min). Prices are in Gemini API's own units as of October 18, 2026.

How much does Gemini API text-to-speech cost?

Gemini 3.8 Flash TTS: $0.50 per 1M text input tokens; $9.00 per 1M audio output tokens through December 31, 2026 ($1.00 / $18.00 starting January 1, 2027). Gemini 3.8 Flash-Lite TTS: $0.50 per 1M text input tokens; $6.00 per 1M audio output tokens through December 31, 2026 ($1.00 / $12.00 starting January 1, 2027). Gemini 3.1 Flash TTS Preview: $1.00 per 1M text input tokens; $20.00 per 1M audio output tokens. Gemini 2.5 Flash Preview TTS: $0.50 per 1M text input tokens; $10.00 per 1M audio output tokens. Gemini 2.5 Pro Preview TTS: $1.00 per 1M text input tokens; $20.00 per 1M audio output tokens. Prices are in Gemini API's own units as of October 18, 2026.

How much does Gemini API realtime voice cost?

Gemini 3.8 Live: $3.00 per 1M audio input tokens ($0.005/min); $12.00 per 1M audio output tokens ($0.018/min). Prices are in Gemini API's own units as of October 18, 2026.

Sources

Verified from each provider's own pricing pages and model docs; every quote was string-matched against the page that day. Prices are shown in the provider's own unit. Values marked derived were counted by us or taken from Azure's Retail Prices API, not from a pricing page. Prices change without notice; check the linked source before you commit a budget to one.

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