How much does an AI voice agent cost per minute? In Neeraj Sharma’s 2026 estimate for one custom inbound-call setup, about $0.025 per minute. That figure combines speech generation, speech recognition, telephony, a realtime-agent platform, model inference and estimated self-hosted infrastructure. It is an author’s calculation using stated assumptions—not a universal rate or an independently audited invoice.
How the 2.5¢ voice-agent minute adds up
The estimate describes a call flowing through a Telnyx SIP trunk into LiveKit SIP. Silero voice activity detection and LiveKit’s v1-mini turn detector run on CPU; xAI provides streaming speech recognition and text-to-speech; Gemini 2.5 Flash-Lite generates responses. Agent workers and Redis session state are self-hosted.
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For the line-item calculation, the author assumes roughly 600 characters of agent speech and 3,000 input tokens plus 175 output tokens per minute. The figures below reproduce that calculation; rates and plan details are as stated in the 2026 article and may change.
| Component | Rate or usage assumption | Estimated cost per minute |
|---|---|---|
| xAI text-to-speech | $15 per 1 million characters; about 600 characters of agent speech | $0.0090 |
| LiveKit SIP | Ship plan, as stated in the article | $0.0040 |
| xAI streaming speech recognition | $0.20 per hour | $0.0033 |
| Telnyx inbound local telephony | Per-minute rate stated in the article | $0.0032 |
| Gemini 2.5 Flash-Lite | $0.10 per 1 million input tokens and $0.40 per 1 million output tokens; stated token assumptions | $0.0004 |
| Turn detection | Local CPU | $0.0000 |
| Workers, Redis and logs | Self-hosted estimate | About $0.0051 |
| Total | Rounded author calculation | About $0.025 |
The longer Axionry analysis presents a related subtotal of $0.0199 after self-hosting workers, bringing its own SIP trunk, switching STT and using Flash-Lite, then adds an estimated $0.0051 for workers, state, logs and observability. These are scenario calculations, not separately verified charges.
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Why speech length matters more than the LLM line here
At the stated assumptions, TTS is the largest individually priced line: about $0.009 per minute, versus about $0.0004 for Gemini 2.5 Flash-Lite. The author’s point is that reducing how much the agent says may save more in this configuration than switching among the low-cost LLM choices discussed. The size of that effect depends on the model, speech volume and token usage; the comparison is not a general ranking of AI costs.
As the author puts it, “Pick it for latency and quality, not price.” That advice concerns the LLM choice in this particular breakdown: the estimated model charge is a small share of the total, so latency and response quality may matter more to the product decision.
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How this estimate compares with managed pricing
The article says its prior managed setup ran at roughly $0.10 per minute and compares the custom estimate with a managed default around $0.11 per minute. It also cites a LiveKit Cloud calculator default around $0.048. Those reference figures do not establish a like-for-like saving: the included services and usage assumptions must match before the totals can be compared.
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Other pricing guides define the bill differently. Some separate speech recognition, the LLM, speech synthesis, carrier and platform fees; another gives a September 2026 range that includes US telephony and a platform fee. Align the following before treating two per-minute quotes as comparable:
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- Inbound versus outbound calls, and the country or region being called.
- Whether billing includes silence, connection time or only active speech.
- How much the agent speaks and how many input and output tokens it uses.
- Whether telephony, platform, observability, hosting and support are included.
- Latency and voice quality, alongside the engineering and maintenance required.
When a custom stack may make sense
The longer Axionry analysis estimates a break-even point around 20,000 monthly minutes under its assumed fixed infrastructure and engineering-maintenance costs. That is a scenario, not a general threshold. A build-versus-buy decision depends on monthly usage, the specific managed quote, infrastructure commitments and the staff time needed to operate the custom stack.
For a practical comparison, calculate the full loaded cost per connected minute for each option, using the same call direction, geography, speech and token assumptions. Include fixed infrastructure and ongoing engineering effort rather than comparing only API rates. A lower variable rate may not mean a lower total bill at modest volume.
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What the 2.5¢ figure does—and does not—establish
The estimate is useful as a worked example of how several small charges combine with speech generation and self-hosted overhead. Its precision is limited: the total is rounded, the infrastructure overhead is estimated, and the available article material does not provide an independently audited invoice. Vendor prices, plan names and billing terms can also change, so verify the current terms for your region and usage before budgeting.
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