> ## Documentation Index
> Fetch the complete documentation index at: https://www.bolna.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Preferred models included in the flat rate
> See exactly which ASR, LLM, and TTS models are bundled into Bolna's flat per-minute rate, so you know when you're on the included tier versus paying variable provider costs.
## 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](/docs/pricing/call-pricing#how-can-i-reduce-my-voice-ai-costs), 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.
***
## Where to see your preferred models
Go to [platform.bolna.ai](https://platform.bolna.ai) and click the **+** button next to your wallet balance in the top-right corner.
This opens the **Add Funds** modal. Scroll to the **"Your Selection"** section below the top-up amount options.
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.
Compare this list with the transcriber, LLM, and voice selected on your agent's [Audio Tab](/docs/agent-setup/audio-tab) and [LLM Tab](/docs/agent-setup/llm-tab). If your agent uses a model not on this list, expect variable pricing for that component.
***
## Current preferred model list
| Provider | Preferred models |
| -------- | ----------------------------- |
| Deepgram | `nova-2`, `nova-3` |
| Azure | `azure` |
| Sarvam | `saarika:v2.5`, `saaras:v2.5` |
See the [Transcriber providers](/docs/providers/transcriber/deepgram) for setup details on each.
| Provider | Preferred models |
| ------------ | ------------------------------------------------------------------- |
| OpenAI | `gpt-4.1-mini`, `gpt-4o-mini` |
| Azure OpenAI | `azure/gpt-4.1-mini`, `azure/gpt-4o-mini`, `azure/ptu-gpt-4-1-mini` |
See the [LLM providers](/docs/providers/llm-model/openai) for setup details on each.
| Provider | Preferred models |
| ---------- | ---------------------------------------- |
| ElevenLabs | `eleven_turbo_v2_5`, `eleven_flash_v2_5` |
| Sarvam | `bulbul:v2` |
| Cartesia | `sonic-english`, `sonic-3` |
See the [Voice providers](/docs/providers/voice/elevenlabs) 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.
***
## Why does this matter for my bill?
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.
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](/docs/pricing/call-pricing#what-does-call-pricing-depend-on).
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.
***
## Related
* [Call pricing breakdown](/docs/pricing/call-pricing) — how the flat rate, telephony, and platform fee fit together
* [Choosing providers](/docs/concepts/choosing-providers) — pick the right model for latency, language, and quality
* [Bring your own keys](/docs/pricing/call-pricing#how-can-i-reduce-my-voice-ai-costs) — connect your own provider accounts instead
* [Enterprise plan](/docs/enterprise/plan) — custom rates and preferred model lists for high-volume accounts