Every published sermon on Sunday is processed through a four-phase pipeline. The pastor records the sermon as usual; everything below happens after upload, in roughly four to seven minutes per hour of audio.
OpenAI Whisper-Large-v3
OpenAI GPT-4o
OpenAI embeddings + Pinecone vector index
OpenAI GPT-4o · Anthropic Claude Sonnet 4.6 (judge)
We use third-party language models from OpenAI and Anthropic. We do not train our own models. The audio you upload, the resulting transcript, and the AI-generated study materials are stored in our database; audio is never used to train external models — we send it through provider APIs configured to opt out of training.
| Stage | Provider | Model |
|---|---|---|
| Transcription | OpenAI | whisper-large-v3 |
| Reading / summarizing | OpenAI | gpt-4o |
| Discussion questions | OpenAI | gpt-4o |
| Quality review (judge) | Anthropic | claude-sonnet-4-6 |
| Scripture embeddings | OpenAI | text-embedding-3-large |
Sunday's philosophy: the teaching belongs to the pastor. AI is the packaging.
We use AI to scaffold what the pastor said — extract clips, identify the scripture being preached, write a summary and a study guide, propose discussion questions. We do not use AI as a substitute for the pastor's teaching. The pastor's voice, framing, and theology are the sermon; the AI organizes that material into a form a small group can study during the week.
Concretely, the AI generates the summary, the themes attached to related scripture cards, the clip titles, the discussion questions, and suggested cross-references. The full transcript and the words inside each clip come directly from the audio. Scripture quotations come directly from canonical Bible text.
Before a study guide is published, the pastor can edit any section in the Sunday dashboard.
Transcription is good but not perfect. If a transcription error makes it to a published study guide, the church is responsible for the fix — either by editing the AI-generated sections that depend on it, or by unpublishing the sermon while the issue is resolved.
Pastors and church admins have full editorial control over everything Sunday generates. The summary, themes, clip titles, discussion questions, and scripture references can all be edited in the dashboard before or after publishing. If the AI got something wrong, the church owns the fix.
Pastors can unpublish any study guide at any time from the sermon's dashboard page. An unpublished sermon disappears from search engines, scripture pages, sitemaps, and the church's public page within a crawl cycle.
If you spot something wrong on a public study guide and aren't sure who to contact, reach us at hello@sunday.app and we'll route it to the church, or unpublish it ourselves while we do.