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Seta implements OpenAI’s transcription endpoint, so migrating off whisper-1 is a base URL change.

the whole migration

For Kazakh that swap is worth 8.71% WER instead of 44.95% — see accuracy.

parameter compatibility

why language is ignored

Not laziness — it is the point. Kazakh and Russian share one output vocabulary, so the model is never told which language to expect and a speaker can switch mid-sentence. Forcing one language per utterance is exactly the Whisper limitation this model exists to remove, so honouring language would make the model worse. It stays accepted so existing clients don’t break.

srt and vtt are refused

They return 400 with a reason, rather than silently handing back JSON:
A character-CTC model has no word-level timestamps to emit. verbose_json returns an empty segments array for the same reason — it is not an error, there is simply nothing truthful to put there. Word timings are on the roadmap.

response shapes

Prefer the native /v1/transcribe endpoint for new code — same auth and price, but it also returns audio_seconds, credits_charged, and real-time factor, which the OpenAI shape has no room for.