Reddit Ads API is changing campaign objectives and retiring onsite lead forms in September

Reddit’s live Ads API v3 documentation has changed the published dates since BTN’s September 3 update. The global notices on the Ads API pages and the dedicated Campaign Objective Migration guide now say updated objective values roll out September 30, 2026, and that onsite lead-generation forms should be retrieved before a September 30 API sunset. However, the What's New table on the same documentation site still lists September 21 for the new objective enums and Lead Generation Forms API sunset, with existing onsite-form ads pausing September 30. Separately, the current What's New notice, What's New table and Get A Report page now say the `HOUR` breakdown will reject ranges longer than seven days starting October 30, 2026. That reverses the December 8 date that the live documentation showed when BTN updated this dossier on September 3.

The technical migration remains consequential, but the immediate operational risk is now documentation drift inside Reddit’s own primary source. Ad-tech integrations still need new objective mappings, an external/offline lead-form path and chunked hourly reporting, but teams should not key deployment plans to a single Reddit date without rechecking the live docs. Because the What's New table retains September 21 while the migration guide says September 30, the prudent engineering deadline is the earlier date until Reddit reconciles the pages.

The site-wide notice and dedicated Campaign Objective Migration guide say the new objective values roll out September 30. The What's New table on the same API site still lists September 21 for Campaigns, Ad Groups and Ads. Legacy objective enums remain supported, but newly created campaigns can return the new values once rollout begins.

The migration guide says onsite lead-generation forms are no longer supported and tells developers to retrieve historical form data before an API sunset on September 30. The What's New table still says the Lead Generation Forms API sunsets September 21, while existing onsite-form ads pause September 30. Advertisers are directed toward external forms measured with the Reddit Pixel or Conversions API.

Current global notices, the What's New table and Get A Report documentation say that from October 30, requests using the `HOUR` breakdown for more than seven days will return a 400 response. BTN’s September 3 version used December 8 because Reddit’s live documentation showed that date at the time; the current primary pages no longer do.

Campaign creation, lead capture and historical reporting are still changing in the same general window. Teams should implement the technical changes now, use September 21 as the safe internal readiness date for objectives/forms until Reddit resolves the conflict, and chunk hourly reports before October 30.