> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ai-coustics.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Model naming changes

> Update model names and IDs for the August and September 2026 transitions.

<Note>
  Naming changes from August and September 2026. Old names and identifiers below describe those transitions. For a current upgrade, start with the [upgrade guide](/reference/sdk/upgrading) and [compatibility matrix](/reference/sdk/compatibility-matrix).
</Note>

## Quail -> Quail Multi Speaker

In September 2026, Quail became Quail Multi Speaker to distinguish the general-purpose model from Quail Voice Focus.

| Old name | New name | Old model ID | New model ID |
| - | - | - | - |
| Quail L (16 kHz) | Quail Multi Speaker L (16 kHz) | `quail-l-16khz` | `quail-ms-l-16khz` |
| Quail L (8 kHz) | Quail Multi Speaker L (8 kHz) | `quail-l-8khz` | `quail-ms-l-8khz` |
| Quail S (16 kHz) | Quail Multi Speaker S (16 kHz) | `quail-s-16khz` | `quail-ms-s-16khz` |
| Quail S (8 kHz) | Quail Multi Speaker S (8 kHz) | `quail-s-8khz` | `quail-ms-s-8khz` |

Quail Voice Focus was not part of this naming change and retains the `quail-vf-*` naming pattern. This does not mean every version remains supported; see [deprecated models](/models/older-models/deprecated-models#quail) for removed Voice Focus IDs.

## VAD: Quail VAD -> VAD -> VAD Multi Speaker

The voice activity detection (VAD) models dropped the Quail prefix in August 2026. In September, the general-purpose model gained an `-ms-` infix to distinguish VAD Multi Speaker from VAD Voice Focus.

**Current rename**

| Old name | New name | Old model ID | New model ID |
| - | - | - | - |
| VAD | VAD Multi Speaker | `vad-2.1-xxs-16khz` | `vad-ms-2.1-xxs-16khz` |

VAD Voice Focus was not part of this step and keeps its `vad-vf-2.0-s-16khz` ID.

**August transition:** these intermediate names precede the September rename above.

| Old name | New name | Old model ID | New model ID |
| - | - | - | - |
| Quail VAD | VAD | `quail-vad-2.0-xxs-16khz` | `vad-2.1-xxs-16khz` |
| Quail VAD Voice Focus | VAD Voice Focus | `quail-vf-vad-2.0-s-16khz` | `vad-vf-2.0-s-16khz` |

<Note>
  VAD moved from 2.0 to 2.1 in this step, so it was both a rename and a newer model version. VAD Voice Focus stayed at 2.0.
</Note>

## Rook -> Rook Multi Speaker

In September 2026, the perceptual speech enhancement models became Rook Multi Speaker. Their IDs gained an `-ms-` infix.

| Old name | New name | Old model ID | New model ID |
| - | - | - | - |
| Rook L (48 kHz) | Rook Multi Speaker L (48 kHz) | `rook-l-48khz` | `rook-ms-l-48khz` |
| Rook L (16 kHz) | Rook Multi Speaker L (16 kHz) | `rook-l-16khz` | `rook-ms-l-16khz` |
| Rook L (8 kHz) | Rook Multi Speaker L (8 kHz) | `rook-l-8khz` | `rook-ms-l-8khz` |
| Rook S (48 kHz) | Rook Multi Speaker S (48 kHz) | `rook-s-48khz` | `rook-ms-s-48khz` |
| Rook S (16 kHz) | Rook Multi Speaker S (16 kHz) | `rook-s-16khz` | `rook-ms-s-16khz` |
| Rook S (8 kHz) | Rook Multi Speaker S (8 kHz) | `rook-s-8khz` | `rook-ms-s-8khz` |

<Note>
  Some old model IDs on this page are no longer supported by the current core SDK. Update to the current IDs above. For models that have been removed, see [deprecated models](/models/older-models/deprecated-models) for their last supported core SDK versions.
</Note>


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