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Comparison LabCompare 27 voice AI platforms and components across seven buying contexts, with sourced capabilities, current price captures and visible unknowns.Voice AI Price Index: prices, evidence and historyUnderstand the complete voice-agent cost stack: models, voice, transcription, telephony, subscriptions, capacity and add-ons.Know the cost before the first callEstimate monthly voice-agent costs, AI minutes, setup expenses and volume scenarios using your own transparent assumptions.AI voice agents for dentalAppointments, rescheduling and after-hours calls—with a person ready for clinical questions. Explore call flows, safe automation, integrations, tests and cost considerations.

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Cognigy vs Sierra

Cognigy is positioned as enterprise agent workflows and Voice Gateway for existing contact-center environments. Sierra is positioned as enterprise customer-service agents spanning voice and other channels, priced around agreed out

The decision in context

Cognigy is positioned as enterprise agent workflows and Voice Gateway for existing contact-center environments. Sierra is positioned as enterprise customer-service agents spanning voice and other channels, priced around agreed outcomes. Start by deciding who owns the missing layers, then inspect the documented differences below.

4 jointly documented catalog fields. This measures evidence coverage, not equivalent quality or an overall winner.

Compare for the job

Test opening hours, booking conflicts and an unanswered transfer.

2 of 4 slots
CognigySierra
Decision signals / differences first

Start where the records differ.

5 of 8 priority fields differ

Values and evidence states are compared together. Shared facts follow the differences; Unknown never means No.

Selected platforms: buyer-critical differences before detailed dimensions
Decision pointCognigySierra
Billing modelDifferent records
custom-sales-ledVerified Yes · 2026-09-28
outcome-basedVerified Yes · 2026-09-28
Billing unitDifferent records
UnknownUnknown after research · 2026-09-28
Contract-defined successful outcomeVerified Yes · 2026-09-28
Bring your telephonyDifferent records
YesConditional · 2026-09-28Voice Gateway
UnknownUnknown after research · 2026-09-28Current captured product corpus; not a universal unsupported claim
Bring your modelDifferent records
YesVerified Yes · 2026-09-28
UnknownUnknown after research · 2026-09-28Current captured product corpus; not a universal unsupported claim
WebhooksDifferent records
YesConditional · 2026-09-28Unknown
UnknownUnknown after research · 2026-09-28UnknownCurrent captured product corpus; not a universal unsupported claim
Warm transferShared state
UnknownUnknown after research · 2026-09-28
UnknownUnknown after research · 2026-09-28Current captured product corpus; not a universal unsupported claim
Your requirements & next steps
Carried from your shortlist

Your requirements

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Ready-made / AI receptionist · Strict evidence mode

No personal requirements yet. Add criteria in Advanced Filter to prioritize this comparison.

Unknown ≠ No
Evidence, side by sideNo benchmark scores
CognigyEnterprise Platforms
SierraEnterprise Platforms
Pricing model
Cognigy
custom-sales-ledVerified Yes · 2026-09-28

Sales-led enterprise component deployment; no public complete rate table in captured product documentation.

Sierra
outcome-basedVerified Yes · 2026-09-28

Payment for specifically agreed valuable outcomes, not uniform minutes.

Headline / base price
Cognigy
UnknownUnknown after research · 2026-09-28

Exact licensed components, speech/model/carrier pass-through and enterprise minimum require a quote.

Sierra
UnknownUnknown after research · 2026-09-28

No complete public commercial schedule or definition of billable outcome; minutes cannot determine total.

Billing unit
Cognigy
UnknownUnknown after research · 2026-09-28

Exact licensed components, speech/model/carrier pass-through and enterprise minimum require a quote.

Sierra
Contract-defined successful outcomeVerified Yes · 2026-09-28

Outcome definition, exceptions and attribution need contract.

Platform fee
Cognigy
UnknownUnknown after research · 2026-09-28

Exact licensed components, speech/model/carrier pass-through and enterprise minimum require a quote.

Sierra
UnknownUnknown after research · 2026-09-28

No complete public commercial schedule or definition of billable outcome; minutes cannot determine total.

Included usage
Cognigy
UnknownUnknown after research · 2026-09-28

Enterprise product and trial documentation reviewed; no complete current commercial schedule/eligibility or bundled provider costs established. Trial Knowledge AI does not inherit contracted SLA.

Sierra
UnknownUnknown after research · 2026-09-28

No supporting statement located in the bounded official corpus; confirm scope with vendor. Unknown is not No.

Current captured product corpus; not a universal unsupported claim
Overage
Cognigy
UnknownUnknown after research · 2026-09-28

Enterprise product and trial documentation reviewed; no complete current commercial schedule/eligibility or bundled provider costs established. Trial Knowledge AI does not inherit contracted SLA.

Sierra
UnknownUnknown after research · 2026-09-28

No supporting statement located in the bounded official corpus; confirm scope with vendor. Unknown is not No.

Current captured product corpus; not a universal unsupported claim
Pass-through costs
Cognigy
Carrier and speech-provider subscription costs may applyConditional · 2026-09-28

Barge-in can increase speech subscription costs; contract determines payment route.

Sierra
UnknownUnknown after research · 2026-09-28

No supporting statement located in the bounded official corpus; confirm scope with vendor. Unknown is not No.

Current captured product corpus; not a universal unsupported claim
Free offer
Cognigy
UnknownNot researched

Not yet researched against this buyer-critical field standard.

Sierra
UnknownNot researched

Not yet researched against this buyer-critical field standard.

Complete cost ceiling
Cognigy
UnknownUnknown after research · 2026-09-28

Exact licensed components, speech/model/carrier pass-through and enterprise minimum require a quote.

Sierra
UnknownUnknown after research · 2026-09-28

No complete public commercial schedule or definition of billable outcome; minutes cannot determine total.

What remains unresolved
Cognigy
UnknownUnknown after research · 2026-09-28

Exact licensed components, speech/model/carrier pass-through and enterprise minimum require a quote.

Sierra
UnknownUnknown after research · 2026-09-28

No complete public commercial schedule or definition of billable outcome; minutes cannot determine total.

Anyone with this link can view the encoded decision criteria.

Vendor documentation establishes a claim. Public model benchmarks are separate context, not measurements of these platforms.

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What to verify together.

Cognigy

No public unit price was established; request itemized platform, speech, carrier and support costs.

Custom quote / current rate unresolved · V3.3 evidence review · Enterprise contract; complete public numeric schedule unavailable

Excluded / confirm: Complete cost cannot be established from this reference. Exact licensed components, speech/model/carrier pass-through and enterprise minimum require a quote. · Carrier and speech-provider subscription costs may apply

custom-sales-ledVerified Yes · 2026-09-28

Sales-led enterprise component deployment; no public complete rate table in captured product documentation.

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Sierra

Agree how an outcome is counted, disputed and audited before comparing costs.

Custom quote / current rate unresolved · V3.3 evidence review · Contract-defined successful outcome; no public numeric quote or uniform per-minute rate

Excluded / confirm: Complete cost cannot be established from this reference. No complete public commercial schedule or definition of billable outcome; minutes cannot determine total. · Provider, carrier and custom contract terms require separate verification

outcome-basedVerified Yes · 2026-09-28

Payment for specifically agreed valuable outcomes, not uniform minutes.

Read the complete profile →

The evidence overlap.

Both records have documented values for Pricing model, MCP tools, Checked within 30 days, Retained price snapshot. Matching availability does not measure behavior under your call conditions.

Run the same booking, tool failure and unsuccessful human-transfer cases. Record both outcomes and billable units before signing a deployment agreement.

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Editorial index gate: noindex-insufficient-evidence. Fewer than five jointly documented fields. More verified comparable evidence is required before indexing.