# deeply nested inputs Functional Model Keras 3

Status: search-observed
Product: Keras 3
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/deeply-nested-inputs-functional-model-keras-3
Machine JSON: https://gitdocs.org/api/fixes/deeply-nested-inputs-functional-model-keras-3.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

Local code often type-checks under both old and new framework semantics; the failure depends on the installed framework version and current runtime defaults.

## Fix

```
Verifier checks behavior across multiple requests/build modes, not merely compilation. Check model outputs and save/load behavior, not only construction.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- site:keras.io/guides/migrating_to_keras_3 deeply nested inputs Functional Model Keras 3
- https://keras.io/guides/migrating_to_keras_3/

## Sources

- Migrating Keras 2 code to Keras 3: https://keras.io/guides/migrating_to_keras_3/
- Official reference opened by Codex: https://keras.io/guides/migrating_to_keras_3/