https://backdiff.pages.dev/model swaps, shifts in behavior, edited plan pages and rewritten terms.enhttps://backdiff.pages.dev/model-version-bump-routine-prompts/https://backdiff.pages.dev/model-version-bump-routine-prompts/Tue, 27 Oct 2026 15:00:00 GMTA model version bump can change instruction following, output structure, tone, factual detail, tool use and the way ambiguous requests are interpreted.https://backdiff.pages.dev/reading-ai-deprecation-notices/https://backdiff.pages.dev/reading-ai-deprecation-notices/Fri, 16 Oct 2026 10:00:00 GMTAn AI deprecation notice signals that a model, endpoint, feature or service is being phased out, but it does not always mean immediate unavailability.https://backdiff.pages.dev/documenting-free-tier-trial-changes/https://backdiff.pages.dev/documenting-free-tier-trial-changes/Thu, 08 Oct 2026 16:00:00 GMTWhen an AI service changes a free tier into a trial, the key task is to document the difference between the previous published offer and the current published offer without assuming that.https://backdiff.pages.dev/frozen-prompt-set-templates/https://backdiff.pages.dev/frozen-prompt-set-templates/Wed, 30 Sep 2026 17:00:00 GMTA frozen prompt set is a dated collection of unchanged prompts and their associated instructions, inputs and expected output characteristics.https://backdiff.pages.dev/reading-ai-feature-lists/https://backdiff.pages.dev/reading-ai-feature-lists/Sat, 26 Sep 2026 15:00:00 GMTAn AI feature list describes the capabilities a provider chooses to advertise, but individual labels can refer to different types of functionality.https://backdiff.pages.dev/summary-output-length-drift-method/https://backdiff.pages.dev/summary-output-length-drift-method/Tue, 22 Sep 2026 08:00:00 GMTOutput length drift occurs when summaries become consistently shorter or longer under conditions that were previously comparable.