Changelog

Breaking changes are marked. Everything else is additive.

31 July 2026

Speech, on OpenAI’s own paths. POST /v1/audio/transcriptions and POST /v1/audio/speech are live. An existing OpenAI audio client needs a new base URL and nothing else.

Two models: whisper-large-v3-turbo (MIT) for transcription, kokoro-82m (Apache-2.0) for synthesis. See Transcriptions and Speech.

Additive — pricing.unit now returns second and character, not only token. Transcription bills per second of audio submitted, rounded up; synthesis bills per character of input. If you parse GET /v1/models, do not assume unit is token — it always carried the unit, and now it carries three of them.

Additive — modality on GET /v1/models. text, stt or tts, so you can pick the right endpoint before calling one.

Additive — context_window is now null for speech models rather than 0. Audio models have no context window; their limits are file size and duration. Text models are unaffected.

30 July 2026

Breaking — dawnstack.credits is now dawnstack.cost_micros and dawnstack.cost_usd. Credits were US dollars multiplied by 100,000 and nothing else, so the unit carried no information the dollar figure did not. The additive block now reads:

"dawnstack": { "cost_micros": 6, "cost_usd": 0.000006, "request_id": "req_8f2a1c" }

One micro-dollar is $0.000001. An existing balance was migrated exactly; nothing changed in value. See Pricing and billing.

Breaking — errors on /v1 now use OpenAI’s envelope. They previously returned {"ok": false, "error": {"code", "message"}}, which has no type and puts message one level from where the SDKs read it, so e.message was empty on every failure. Now:

{ "error": { "message": "…", "type": "insufficient_quota", "param": null, "code": "INSUFFICIENT_BALANCE" } }

If you wrote a workaround for empty error messages, you can delete it. See Errors.

Fixed — tool calls now stream. delta.tool_calls was dropped by the frame rewriter, so a streamed tool call arrived as an empty stream ending in finish_reason: "stop". If you concluded tool calling did not work with stream: true, it does now. finish_reason is also no longer flattened to "stop", so length and tool_calls come through.

Added — stream_options: { include_usage: true }. It was silently stripped before, so a stream never carried token counts. See Streaming.

Added — GET /v1/models/{id}, OpenAI’s retrieve-model endpoint. client.models.retrieve() used to 404.

Added — response headers. Retry-After and X-RateLimit-Reset on 429, WWW-Authenticate on 401, and the leading delta: {"role": "assistant"} frame on every stream.

Changed — x-request-id is the header name everywhere. The playground used x-dawnstack-request-id.

Changed — session-authenticated requests to /v1/chat/completions are now rate limited at 20 a minute per account. They were unlimited. Key-authenticated requests are unaffected at 60 a minute.

Changed — the docs. This reference replaced a single page. Old #anchor links still land on the reference, though not on the exact section.

30 July 2026, earlier

Changed — prices fell 53% to 86% on output across the catalogue, at unchanged margin, when supply moved to a different provider. The catalogue grew from 9 models to 45.

Changed — GET /v1/models is now public. It required an API key, so nobody could read the catalogue or the prices before signing up and no third-party tool could discover us. It also now publishes supported_parameters, quantization, the maker, and measured speed.

Fixed — tools and response_format were being silently dropped. The request schema listed five fields and everything else was stripped, so a caller who sent tools got a 200 with prose and no explanation. The full OpenAI parameter set is forwarded now, and tool_calls is returned in the response. If you tried tool calling before this date and it appeared to do nothing, that is why.

26 July 2026

POST /v1/chat/completions went live.