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How to Use Cartesia for Low-latency voice agents
Learn Cartesia low-latency voice agents with step by step workflows, realistic examples, and verified plan notes.
Cartesia works well for low-latency voice agents when you run it like production work: locked brief, SOURCE facts, then review before publish. Cartesia provides real-time speech and transcription models for voice agents, including Sonic TTS and Ink STT with low-latency streaming APIs. Confirm live pricing and latency claims on cartesia.ai. Start at /explore/cartesia.
This guide focuses on low-latency voice agents in detail. Related Cartesia articles: /blog/how-to-use-cartesia-for-support-prompt-follow-ups, /blog/how-to-use-cartesia-for-api-spend-monitoring, /blog/how-to-use-cartesia-for-key-rotation-practices.
When this workflow is the right job
Use low-latency voice agents when the deliverable is specifically this Cartesia job. Switch to sonic tts streaming greetings when that workflow already owns the asset.
Step by step workflow
1. Brief Low-latency voice agents
Write what must stay true for low-latency voice agents in Cartesia before settings or spend.
Brief: Low-latency voice agents Keep: verified SOURCE facts only Avoid: invented pricing or features Success: one reviewable output
2. Open Cartesia for Low-latency voice agents
Use the Cartesia surface that owns low-latency voice agents. Do not mix a neighboring workflow in the same pass.
Surface: Low-latency voice agents Start: pilot with one representative input Plans: cartesia.ai
3. Pilot Low-latency voice agents
Run a single low-latency voice agents pilot. Score clarity, grounding, and whether the output is reviewable.
Pilot: Low-latency voice agents [ ] SOURCE facts match [ ] Output reviewable [ ] Settings logged
4. Refine Low-latency voice agents
Change one low-latency voice agents dimension only. Save a template from the best run.
Refine: Low-latency voice agents Change: one control only Keep: SOURCE and success criteria
Practical low-latency voice agents examples
Streaming prototype
Scenario: A media team runs Low-latency voice agents in Cartesia for "Streaming prototype". Objective: Produce a reviewable transcript or speech artifact for Streaming prototype with required features named. Inputs: - Audio/file reference for Streaming prototype - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Streaming prototype → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Streaming prototype matching requested features, ready for human edit.
PII redaction
Scenario: A media team runs Low-latency voice agents in Cartesia for "PII redaction". Objective: Produce a reviewable transcript or speech artifact for PII redaction with required features named. Inputs: - Audio/file reference for PII redaction - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process PII redaction → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for PII redaction matching requested features, ready for human edit.
Subtitle SRT
Scenario: A media team runs Low-latency voice agents in Cartesia for "Subtitle SRT". Objective: Produce a reviewable transcript or speech artifact for Subtitle SRT with required features named. Inputs: - Audio/file reference for Subtitle SRT - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Subtitle SRT → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Subtitle SRT matching requested features, ready for human edit.
Interview mp3
Scenario: A media team runs Low-latency voice agents in Cartesia for "Interview mp3". Objective: Produce a reviewable transcript or speech artifact for Interview mp3 with required features named. Inputs: - Audio/file reference for Interview mp3 - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Interview mp3 → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Interview mp3 matching requested features, ready for human edit.
Guardrail filter
Scenario: A media team runs Low-latency voice agents in Cartesia for "Guardrail filter". Objective: Produce a reviewable transcript or speech artifact for Guardrail filter with required features named. Inputs: - Audio/file reference for Guardrail filter - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Guardrail filter → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Guardrail filter matching requested features, ready for human edit.
API spend alert
Scenario: A media team runs Low-latency voice agents in Cartesia for "API spend alert". Objective: Produce a reviewable transcript or speech artifact for API spend alert with required features named. Inputs: - Audio/file reference for API spend alert - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process API spend alert → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for API spend alert matching requested features, ready for human edit.
Key rotation
Scenario: A media team runs Low-latency voice agents in Cartesia for "Key rotation". Objective: Produce a reviewable transcript or speech artifact for Key rotation with required features named. Inputs: - Audio/file reference for Key rotation - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Key rotation → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Key rotation matching requested features, ready for human edit.
Latency pick
Scenario: A media team runs Low-latency voice agents in Cartesia for "Latency pick". Objective: Produce a reviewable transcript or speech artifact for Latency pick with required features named. Inputs: - Audio/file reference for Latency pick - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Latency pick → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Latency pick matching requested features, ready for human edit.
Word timestamps
Scenario: A media team runs Low-latency voice agents in Cartesia for "Word timestamps". Objective: Produce a reviewable transcript or speech artifact for Word timestamps with required features named. Inputs: - Audio/file reference for Word timestamps - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Word timestamps → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Word timestamps matching requested features, ready for human edit.
Custom vocab
Scenario: A media team runs Low-latency voice agents in Cartesia for "Custom vocab". Objective: Produce a reviewable transcript or speech artifact for Custom vocab with required features named. Inputs: - Audio/file reference for Custom vocab - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Custom vocab → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Custom vocab matching requested features, ready for human edit.
Noise note
Scenario: A media team runs Low-latency voice agents in Cartesia for "Noise note". Objective: Produce a reviewable transcript or speech artifact for Noise note with required features named. Inputs: - Audio/file reference for Noise note - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Noise note → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Noise note matching requested features, ready for human edit.
Chapter titles
Scenario: A media team runs Low-latency voice agents in Cartesia for "Chapter titles". Objective: Produce a reviewable transcript or speech artifact for Chapter titles with required features named. Inputs: - Audio/file reference for Chapter titles - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Chapter titles → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Chapter titles matching requested features, ready for human edit.
Action items audio
Scenario: A media team runs Low-latency voice agents in Cartesia for "Action items audio". Objective: Produce a reviewable transcript or speech artifact for Action items audio with required features named. Inputs: - Audio/file reference for Action items audio - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Action items audio → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Action items audio matching requested features, ready for human edit.
Multilingual flag
Scenario: A media team runs Low-latency voice agents in Cartesia for "Multilingual flag". Objective: Produce a reviewable transcript or speech artifact for Multilingual flag with required features named. Inputs: - Audio/file reference for Multilingual flag - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Multilingual flag → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Multilingual flag matching requested features, ready for human edit.
Webhook delivery
Scenario: A media team runs Low-latency voice agents in Cartesia for "Webhook delivery". Objective: Produce a reviewable transcript or speech artifact for Webhook delivery with required features named. Inputs: - Audio/file reference for Webhook delivery - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Webhook delivery → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Webhook delivery matching requested features, ready for human edit.
Retry policy
Scenario: A media team runs Low-latency voice agents in Cartesia for "Retry policy". Objective: Produce a reviewable transcript or speech artifact for Retry policy with required features named. Inputs: - Audio/file reference for Retry policy - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Retry policy → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Retry policy matching requested features, ready for human edit.
Content filter
Scenario: A media team runs Low-latency voice agents in Cartesia for "Content filter". Objective: Produce a reviewable transcript or speech artifact for Content filter with required features named. Inputs: - Audio/file reference for Content filter - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Content filter → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Content filter matching requested features, ready for human edit.
Short pilot clip
Scenario: A media team runs Low-latency voice agents in Cartesia for "Short pilot clip". Objective: Produce a reviewable transcript or speech artifact for Short pilot clip with required features named. Inputs: - Audio/file reference for Short pilot clip - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Short pilot clip → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Short pilot clip matching requested features, ready for human edit.
Speaker labels
Scenario: A media team runs Low-latency voice agents in Cartesia for "Speaker labels". Objective: Produce a reviewable transcript or speech artifact for Speaker labels with required features named. Inputs: - Audio/file reference for Speaker labels - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Speaker labels → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Speaker labels matching requested features, ready for human edit.
Auto chapters
Scenario: A media team runs Low-latency voice agents in Cartesia for "Auto chapters". Objective: Produce a reviewable transcript or speech artifact for Auto chapters with required features named. Inputs: - Audio/file reference for Auto chapters - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Auto chapters → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Auto chapters matching requested features, ready for human edit.
Topic summary
Scenario: A media team runs Low-latency voice agents in Cartesia for "Topic summary". Objective: Produce a reviewable transcript or speech artifact for Topic summary with required features named. Inputs: - Audio/file reference for Topic summary - Feature flags (speakers/chapters/etc.) - Language locale - PII handling rules Workflow: Upload or stream → Configure Low-latency voice agents → Process Topic summary → Review transcript → Export Requirements: - Stay within verified Cartesia capabilities; do not invent features. - Confirm live plan notes on cartesia.ai before promising volume. - Change one variable between iterations. - Human-review before external publish, send, billing, or clinical/legal use. - Confirm API/plan limits on the official pricing page before batch jobs. Expected output: A transcript/artifact for Topic summary matching requested features, ready for human edit.
How to improve low-latency voice agents
Cut noise from low-latency voice agents by removing extra adjectives while preserving SOURCE facts in Cartesia.
Raise quality by insisting on a single success check before debating style.
Make review easier by labeling fields that must never change.
Speed iteration by cloning the last good run and altering only one control.
Stabilize outputs by pinning settings after the pilot is approved.
Reduce rework by rejecting drafts that invent claims.
Improve handoffs by recording which control produced the best result.
Harden the workflow by testing an incomplete input before trusting defaults.
Prompting and usage guidance
Name the low-latency voice agents job, audience, and success check before opening Cartesia.
Paste only verified facts under SOURCE so Cartesia cannot invent details.
Specify the deliverable shape up front.
Call out fixed details versus flexible style choices.
Ask Cartesia to flag unsupported claims before you accept the draft.
Limitations to respect
Check Cartesia plan gates for low-latency voice agents on cartesia.ai before you promise timelines.
Keep drafts unpublished until a human confirms SOURCE facts.
Cartesia can be wrong. Treat low-latency voice agents as provisional until review.
If documentation is silent on a claim, leave it out rather than guessing.
Practical tips for this workflow
Pilot once before batching low-latency voice agents in Cartesia.
Keep a reusable template with variables for low-latency voice agents.
Separate creative instructions from SOURCE facts.
Log settings from the best run.
Common mistakes
- Skipping the pilot run before scaling volume
- Inventing pricing, quotas, or features not on official pages
- Mixing unrelated workflows in one session
- Publishing without a human review gate
Treat low-latency voice agents in Cartesia as a production workflow: brief, pilot, refine, then ship with review. Related reading: /blog/how-to-use-cartesia-for-support-prompt-follow-ups, /blog/how-to-use-cartesia-for-api-spend-monitoring, /blog/how-to-use-cartesia-for-key-rotation-practices.