# Output Breaks After Model Change

## Ontology Metadata

Code: ISS-0052
Version: ISS-0052@0.1.0
Ontology release: 0.1.0
Updated: 2026-05-10T00:00:00Z
Canonical URL: /workbench/issues/output-breaks-after-model-change/

## Summary

Output that previously worked begins failing after a model, mode, runtime, or product behavior changes.

## Category

- CAT-0080 — Changes & Versions
  - URL: /workbench/categories/changes-and-versions/
  - Summary: Problems where model behavior, prompts, contracts, schemas, outputs, references, rubrics, or expectations change without the surrounding workflow updating correctly.

## Primary Pattern

- PAT-0180 — Compatibility Violation
  - URL: /workbench/patterns/compatibility-violation/
  - Summary: A structural condition where a graph, object, behavior, or runtime state exceeds a declared compatibility envelope without an authorized exception.

## Declared Patterns

- PAT-0180 — Compatibility Violation
  - URL: /workbench/patterns/compatibility-violation/
  - Summary: A structural condition where a graph, object, behavior, or runtime state exceeds a declared compatibility envelope without an authorized exception.
- PAT-0190 — Contract Drift
  - URL: /workbench/patterns/contract-drift/
  - Summary: A structural condition where a declared contract changes but connected structures, implementations, consumers, or expectations do not update in sync.
- PAT-0290 — Divergent Outputs
  - URL: /workbench/patterns/divergent-outputs/
  - Summary: A structural condition where parallel evaluations under comparable scope and shared authority produce non-equivalent outputs.

## Derived Primary Lenses

- LEN-0130 — Compatibility Envelope Lens
  - URL: /workbench/lenses/compatibility-envelope-lens/
  - Summary: Determines whether structure fits within declared runtime, platform, version, or support constraints.
- LEN-0170 — Convergence Lens
  - URL: /workbench/lenses/convergence-lens/
  - Summary: Compares parallel structural systems to determine whether they align under shared authority.
- LEN-0270 — Reconciliation Lens
  - URL: /workbench/lenses/reconciliation-lens/
  - Summary: Evaluates whether structural changes align with declared authority updates, version changes, or reconciliation rules.
- LEN-0290 — Variance / Entropy Lens
  - URL: /workbench/lenses/variance-entropy-lens/
  - Summary: Measures structural variability across repeated or comparable evaluations and identifies divergence beyond expected bounds.

## Derived Secondary Lenses

- LEN-0120 — Boundary Compliance Lens
  - URL: /workbench/lenses/boundary-compliance-lens/
  - Summary: Evaluates observed structure against declared boundary posture, including allow, block, and exception rules.
- LEN-0140 — Compression Lens
  - URL: /workbench/lenses/compression-lens/
  - Summary: Reduces structural graphs into stable minimal representations for comparison, redundancy detection, and diffing.
- LEN-0180 — Determinism Lens
  - URL: /workbench/lenses/determinism-lens/
  - Summary: Evaluates whether identical structural inputs produce equivalent structural outputs across repeated executions.

## Search Intents

- output breaks after model change
- AI output changed after model update
- model change broke output format
- prompt worked before model update
- output no longer works after upgrade
- model version changed output