🌿 Fern Regeneration -- March 26, 2026

[fern-api]

This PR regenerates code to match the latest API Definition.

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Note

Medium Risk
Adds a new Audio surface to the top-level client with multipart file upload logic, which could affect request construction and error handling despite being additive. Regeneration also bumps SDK/user-agent versions, which may impact downstream clients that assert on headers or version strings.

Overview
Adds a new client.Audio.Transcriptions.Create API for audio file transcription, including generated request/response types (TranscriptionsCreateRequest, AudioTranscriptionsCreateResponse) and a multipart-upload raw client targeting POST /v2/audio/transcriptions, plus accompanying wire and serialization tests.

Bumps the generated SDK version from v2.17.0 to v2.19.0 (metadata + X-Fern-SDK-Version/User-Agent headers) and updates reference.md to document the new Audio Transcriptions endpoint.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Audio endpoint uses empty ErrorCodes, losing typed errors

Medium Severity

audio.ErrorCodes is initialized as an empty internal.ErrorCodes{} map, while all other sub-clients (batches, connectors, models, etc.) reference the root package's ErrorCodes which maps HTTP status codes (400, 401, 403, 404, 429, 500, etc.) to typed error constructors. The audio transcriptions raw_client.go passes audio.ErrorCodes to internal.NewErrorDecoder, so API error responses from the audio endpoint will never be decoded into typed errors like *BadRequestError or *TooManyRequestsError — only generic *core.APIError is returned. Users performing errors.As checks against typed errors will silently fail to match for audio endpoints.

Additional Locations (1)

• audio/transcriptions/raw_client.go#L82-L83