Content Quality: Concise Briefing (707 words, range 300-800; title 99 chars). Clear structure: Overview, Prompt-to-Voice, Native Decisions Integration, What We Don't Know. Appropriate technical depth.
Source Verification: Read all three gzipped snapshots (source-0 changelog, source-1 custom-voices guide, source-2 decisions-voice guide), all HTTP 200, suspicious_patterns null for all. Because OpenAI pages have previously produced bogus years in summarizing fetchers, I used raw HTML text only. Changelog (source-0): under the heading 'October, 2026', 'Oct 16' entry lists gpt-live-1, v1/audio/voices, v1/live/sessions and says 'Released prompt-to-voice for all API customers. Create a custom voice from a text description through the API or voice Playground, then reuse it in GPT-Live sessions. Creating a prompt-generated voice is free; speech generation uses regular GPT-Live session billing.' and 'Added nine natural voices for GPT-Live: Nuri, Juni, and Flitz (German); Brise and Sillage (French); Nira (Hindi); Harema and Shida (Japanese); and Noeul (Korean)' (nine names, matches). 'Oct 15' entry lists gpt-live-1 and gpt-6-luna: 'Added native Decisions integration in GPT-Live'. Dates October 16 / October 15 confirmed; both quotes verbatim. Custom-voices guide (source-1): 'creates and saves a voice from a text description' verbatim; no reference or consent recording needed; 'generally available to all API customers'; prompt-generated voices work with GPT-Live and are not supported by Text to Speech, Realtime or Chat Completions, while recording-based voices work with those APIs; POST https://api.openai.com/v1/audio/voices with type 'prompt', name, prompt, model ('auto'); script_hint optional, up to 2,000 characters, blank or too-short rejected; response is metadata (ID, creation time, original prompt) with no audio or preview; up to 100 prompt-generated voices per organization, limit also applies to voices created for an app's customers; responsible use (no children's voices, no impersonation, tell listeners speech is AI-generated); 'Voices aren't guaranteed to be unique' verbatim; qualities listed include accent, pace, pitch, timbre, distinctiveness (guide frames them as prompt description rather than parameters). Decisions voice guide (source-2): native vs custom delegation as described; 'skips a round trip through your app' and 'stays fixed for that session' verbatim; api.decisions.write permission; 'You don't need a Decisions-specific alpha header'; gpt-6-luna in example; 'Live sends the conversation transcript to Decisions automatically'; decision.event with event.type decision.completed and answers read by question name in event.decision.answers; 'none' is a no-op; in-car example (temperature, defogger, Responses API call needing api.responses.write); session.triggers for session.input_transcript.delta / session.output_transcript.delta; 'I got the job!' digital-person example; 'Live can combine pending deltas, and results can arrive out of order'; 'Transcript triggers run independently of delegation'. Live re-fetch (curl, raw HTML) of all three URLs on 2026-10-20 is byte-identical in extracted text to the snapshots (only a trailing newline differs), so no drift. Domain developers.openai.com is on config/source_allowlist.txt by exact hostname (line 215, with justification comment); no allowlist edit needed. All three sources are OpenAI first-party documentation; no independent source exists, and the article states this explicitly in its closing section.
Factual Accuracy: Every date, voice name, event name, limit (100 voices, 2,000 characters), permission, billing statement and quote traced to the snapshots. No pricing for Decisions via GPT-Live appears in the sources and the article correctly says so. No unsupported specifics found. The claim that voice extension beyond GPT-Live is not stated is consistent with the guide. Prior-article statements (gpt-6-luna, Decisions beta) match the published Decisions article.
Overall Assessment: Accurate, well-sourced, neutral Briefing with every figure and quote verified against raw source text. Approved without corrections.