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What are preferred models?

Every Bolna workspace ships with a flat per-minute rate — $0.06/min (₹5.52/min) at standard wallet tiers — that already includes a curated set of transcriber (ASR), LLM, and voice (TTS) models. As long as your agent uses only these models, your Voice AI cost is the flat rate — you don’t see separate line items for STT, LLM, or TTS usage. If you pick a model outside this list (a premium model, a BYOK provider, or a model not yet marked as preferred), that component is billed at variable, usage-based rates instead of the flat rate. This is the single biggest reason two agents with the same call volume can see very different bills.
Preferred models change over time as Bolna negotiates provider rates and adds new options. This page is a snapshot — always check the Add Funds panel in your dashboard for the current list on your account.
Larger wallet top-ups (e.g. $600+) get a lower effective per-minute rate as a volume discount — the preferred model bundle itself is the same across tiers.

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Where to see your preferred models

1

Open Agent Studio and click the wallet '+' button

Go to platform.bolna.ai/dashboard and click the + button next to your wallet balance and remaining minutes in the top-right corner of the Agent Studio header.
Bolna Agent Studio header showing the wallet balance, remaining minutes and the + button used to open the Add Funds panel

The + button next to your wallet balance in Agent Studio opens the Add Funds panel

2

Open the Add Funds panel

This opens the Add Funds modal. Scroll to the “Your Selection” section below the top-up amount options.
3

Click 'Show models'

Under “Your preferred models (included in the 6¢/min rate)”, click Show models to expand the panel. It lists every ASR, LLM, and TTS model bundled into your current rate, grouped by category.
Add Funds modal with top-up amounts, a Your Selection card showing effective price $0.060/min and total minutes, and the expanded preferred models panel listing ASR, LLM and TTS models

The Add Funds panel with 'Your preferred models' expanded, showing ASR, LLM, and TTS models included in the flat rate

4

Cross-check against your agent config

Compare this list with the transcriber, LLM, and voice selected on your agent’s Languages Tab and Intelligence Tab. If your agent uses a model not on this list, expect variable pricing for that component.

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Current preferred model list

See the Transcriber providers for setup details on each.
Model names above match what’s shown in the dashboard exactly (including casing and version suffixes like :v2.5). Selecting a similarly-named model from a different provider, or a newer/older version of the same model, may fall outside the preferred list.

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Why does this matter for my bill?

On the flat rate

Agent uses only preferred ASR + LLM + TTS models → you pay the flat per-minute rate plus telephony and platform fee. No separate Voice AI usage line items.

Off the flat rate

Agent uses any non-preferred model → that component (STT, LLM, or TTS) is billed at variable, usage-based rates on top of telephony and platform fee. See the call pricing breakdown.
You can mix and match: for example, run a preferred LLM with a non-preferred TTS voice. Only the non-preferred component is billed separately — everything else stays on the flat rate.