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Hume launched Octave on February 26, 2025, as a text-to-speech model designed to use context and delivery instructions—not just pronunciation rules—to generate expressive speech. It can create voices from natural-language descriptions, clone a voice from a short recording, and adjust pacing, emphasis, pitch, tone, and emotional character.
The original launch is now only part of the story. Hume’s newer Octave 2 is documented as a live preview with broader language support, lower stated model latency, voice conversion, phoneme editing, and timestamp support. Because Octave 2 remains a preview, its capabilities, pricing, and availability may change.
What is Hume Octave?
Octave is Hume’s expressive text-to-speech system. Hume expands the name as “Omni-capable Text and Voice Engine” and describes it as a speech-language model: a system intended to model both language and speech rather than simply converting written characters into phonemes.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →In practical terms, Octave uses semantic context to influence how a line is spoken. The same sentence may be delivered differently depending on whether its context suggests excitement, disappointment, sarcasm, calm reassurance, or urgency. Hume’s documentation says the system can adapt pronunciation, pitch, tempo, and emphasis according to an utterance’s intended meaning.
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That does not mean Octave experiences emotions or understands them like a person. “Understands” is best read operationally: the model uses meaning and context in the input to shape generated prosody and vocal delivery.
What launched in February 2025?
Hume’s February 26, 2025 announcement presented Octave as a model that could:
- Generate a voice from a natural-language description.
- Clone a voice from a short recording.
- Perform character-style or “acting” deliveries.
- Follow instructions that alter emotion, pacing, emphasis, and speaking style.
- Use context-aware prosody in narration and interactive experiences.
- Support different voices or personalities within an application.
Hume had introduced Octave in an earlier December 2024 announcement, but the February post framed the product as available through its platform and API.
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Read Hume’s February 2025 launch announcement.
Voice design through ordinary language
Instead of choosing only from fixed acoustic settings, developers can describe the voice they want. Hume’s current voice documentation says its Voice Library contains more than 100 Hume-created voices, while custom voices can be designed through prompts. These voices can be used with Hume’s TTS and EVI products.
Useful descriptions can specify perceived age, accent, tone, personality, energy, emotional character, and speaking style. For example:
- “A patient, empathetic counselor with a warm, measured delivery.”
- “A rapid-fire Brooklyn cab driver with a nasal, high-energy voice.”
- “A dramatic medieval knight speaking with restrained authority.”
These descriptions are guidance, not guaranteed controls over every acoustic property. Results can vary with wording, model version, language, and script complexity. A voice prompt that works well for a short line may not produce the same level of consistency across a long audiobook or game script.
See Hume’s voice design and cloning documentation.
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How Octave controls emotion and delivery
Octave has two important control layers.
1. Context in the spoken text
The words themselves provide clues about intent. “I can’t believe you actually came” could sound joyful, angry, disbelieving, or affectionate depending on the surrounding context.
2. Explicit performance instructions
Hume’s TTS API supports an utterance containing spoken text, an optional description, an optional voice, speed, and trailing silence. The spoken words belong in the text field; performance guidance belongs in description where supported.
Specific instructions are generally more useful than a single abstract label. A practical direction might describe intensity, pacing, pauses, audience, and how the delivery should change during the sentence:
“Deliver this with surprised delight, pause briefly after ‘believe,’ then soften at the end.”
Teams should generate several versions rather than assuming one instruction will produce a perfectly repeatable performance. Expressiveness is not the same as deterministic control over every pause, syllable, or emotional transition.
Hume’s launch comparison
Hume reported a blind comparison involving 180 human raters and 120 diverse prompts against ElevenLabs Voice Design. In Hume’s results, Octave was preferred for:
| Category | Hume-reported preference |
|---|---|
| Audio quality | 71.6% |
| Naturalness | 51.7% |
| Matching the requested voice description | 57.7% |
These are Hume’s own study results, not an independent industry benchmark. The comparison was against a specific ElevenLabs feature, not every ElevenLabs model or product. The percentages are preference results rather than universal objective scores, so production teams should evaluate their own scripts, languages, voices, and delivery requirements.
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Review Hume’s reported comparison.
Octave 1 versus Octave 2 preview
Hume announced Octave 2 on October 1, 2025. Current documentation labels it a preview and distinguishes it from the original Octave model.
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| Capability | Octave 1 | Octave 2 preview |
|---|---|---|
| Languages | English and Spanish | Arabic, English, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Russian, and Spanish |
| Stated model latency | Approximately 200 ms in the current comparison | Approximately 100 ms, excluding network transit |
| Voice cloning | Supported | Supported; Hume advertises cloning from as little as 15 seconds of audio |
| Voice design | Supported | Current feature table lists voice design as English-only |
| Voice conversion | Not established in the original launch material | Documented for Octave 2 |
| Word and phoneme timestamps | Availability varies | Supported when requested through the appropriate Octave 2 version |
| Status | Original model | Preview |
Hume’s October 2025 announcement said Octave 2 was approximately 40% faster and half the price of Octave 1, and that it could generate audio in under 200 milliseconds. Current API documentation gives a more specific figure of approximately 100 milliseconds for Octave 2, excluding network transit. Neither figure should be treated as guaranteed end-to-end time to audible audio.
There is also a documentation qualification worth noting: the original Octave material emphasized acting instructions, while the current feature table marks acting instructions for Octave 2 as “coming soon.” That discrepancy may reflect version or documentation changes. Teams should verify the active model’s supported controls before building around them.
See the current model overview and language and feature FAQ.
Voice cloning and voice conversion
Hume says a voice clone can be created from as little as 15 seconds of audio. Octave 2’s launch material also describes cross-language generation intended to preserve the speaker’s accent.
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A short recording can be enough to create an initial clone, but it is not proof of studio-grade identity preservation. Test pronunciation, accent transfer, emotional range, consistency, and long-form stability across every target language.
Voice cloning also requires more than technical access. Obtain permission from the speaker, and consider publicity, impersonation, employment, privacy, and disclosure obligations. A paid account does not automatically establish the right to clone a person’s voice.
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Octave 2 also supports voice conversion. Hume documents supported input formats including MP3, WAV, M4A, and OGG. Voice conversion is useful when a performance needs to retain timing or delivery while changing vocal identity, but it should be evaluated separately from text-to-speech voice design.
Timestamps for captions and animation
Octave 2 supports word-level and phoneme-level timestamps. These can be used for:
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- Avatar lip-sync.
- Audio segmentation.
- Post-production editing.
- Synchronizing speech with animation or other media.
Timestamps must be explicitly requested, and Hume says the feature requires the appropriate Octave 2 request version.
Read the timestamp documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to try Octave
No-code testing
Use Hume’s Octave product page or platform playground to try voices from the library, enter text, experiment with voice descriptions, and adjust speed where available. The product page advertises voice selection, cloning, voice design, streaming, multiple audio formats, and timestamp support. Feature availability can depend on the active model and account, so check the current interface rather than assuming every plan exposes every control.
API integration
To use the API, create a Hume account, obtain an API key, store it securely, select a model version, and choose or create a compatible voice. A minimal streaming JSON request based on Hume’s documented pattern is:
curl https://api.hume.ai/v0/tts/stream/json
-H "X-Hume-Api-Key: $HUME_API_KEY"
-H "Content-Type: application/json"
--json '{
"version": "2",
"utterances": [
{
"text": "I cannot believe you made it.",
"description": "Deliver this with surprised delight, then soften at the end.",
"speed": 1.0,
"trailing_silence": 0.2
}
]
}'For a fixed voice, add a voice object to the first utterance:
"voice": {
"id": "VOICE_ID"
}Hume’s voice guide says a voice specified in the first utterance is used for subsequent utterances unless overridden. It also says Octave 1 voices can be used with Octave 1 and Octave 2 requests, while Octave 2 voices require Octave 2.
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Verify the live API reference before deployment because endpoints, fields, model compatibility, and output handling can change.
Open the JSON synthesis reference and voice compatibility documentation.
What can developers build?
Octave is relevant to:
- Narration, audiobooks, podcasts, and voice-over.
- Game characters and interactive fiction.
- Animated characters and avatars.
- Training and instructional content.
- Conversational interfaces and voice agents.
- Caption synchronization and lip-sync.
- Dubbing or accent-preserving voice transformations.
Keep Hume’s TTS and EVI products distinct. TTS converts text into speech. EVI is Hume’s real-time speech-to-speech interface for conversational systems. Octave can be one component in a voice-agent stack, but it is not itself the complete application architecture.
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Hume’s pricing page viewed in August 2026 listed the following TTS allowances:
| Plan | Monthly price shown | Included TTS characters | Approximate audio |
|---|---|---|---|
| Free | $0 | 10,000 | 10 minutes |
| Starter | $3 | 30,000 | 30 minutes |
| Creator | $7 promotional first month; $14 listed price | 140,000 | 140 minutes |
| Pro | $70 | 1,000,000 | 1,000 minutes |
| Scale | $200 | 3,300,000 | 3,300 minutes |
| Business | $500 | 10,000,000 | 10,000 minutes |
| Enterprise | Custom | Custom | Custom |
The same page listed paid-tier overage rates of $0.15 per 1,000 characters for Creator, $0.12 for Pro, $0.10 for Scale, and $0.05 for Business. The visible table displayed Octave 1 and Octave 2 selectors but did not clearly establish separate pricing for every model and feature. Check the current account interface and terms before budgeting.
Commercial licensing must be checked separately. Hume’s pricing page includes a commercial-license row, but the available information does not establish that every paid plan includes identical commercial rights. Review the current Terms of Use, plan-specific license language, enterprise agreement, and voice-consent requirements.
Limitations to consider
- Octave 2 is a preview. Features, prices, quality, and availability can change.
- Latency is not end-to-end latency. Hume’s model figures exclude network transit and do not guarantee time to first audible audio.
- Language support is asymmetric. Octave 2 lists 11 synthesis languages, but current voice-design documentation lists English-only voice design.
- Expressiveness is not perfect controllability. A voice can sound emotional while missing the requested intensity, pause, pronunciation, or attitude.
- Long-form consistency needs testing. Watch for voice drift, pacing changes, pronunciation errors, and emotional inconsistency.
- Benchmarks are vendor-reported. Hume’s launch comparison has not been treated here as an independent benchmark.
- Voice cloning carries legal and ethical risks. Technical capability does not replace consent or rights clearance.
- Documentation can change. The current acting-instruction status differs from the original launch messaging.
A practical evaluation checklist
Before committing to Octave, test:
- The same neutral, emotional, sarcastic, and character dialogue in Octave 1 and Octave 2.
- Names, acronyms, numbers, symbols, and uncommon words.
- Long-form continuation across scene boundaries.
- A cloned voice in each target language.
- First-byte latency separately from complete-file generation time.
- Word and phoneme timestamp output if captions or animation are required.
- Repeatability across several generations of the same line.
- Total cost under the intended plan, including overage.
- Commercial rights and consent documentation for every real-person voice.
Who should use Octave?
Octave is a strong candidate when contextual delivery, expressive speech, natural-language voice design, short-sample cloning, streaming, or timestamped output matters more than fully deterministic controls.
It may be less suitable for teams that require a stable non-preview model, independently verified benchmarks, multilingual voice design, strict repeatability, local deployment, frame-level phoneme control, or clearly documented commercial rights on a particular plan.
Teams should compare it with alternatives such as ElevenLabs, Cartesia, and PlayAI using current pricing, language, licensing, cloning, latency, and API documentation.
The Bottom Line
Bottom line: Octave’s meaningful idea is to make text-to-speech more sensitive to semantic context and performance direction. The February 2025 launch established that approach; Octave 2 is the newer, broader, faster-stated preview. It is worth evaluating for expressive characters, narration, voice agents, and developer APIs—but production teams should verify preview limitations, repeatability, language-specific voice design, pricing, and commercial rights before adopting it.
Quick Recap
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