JSON schema validation — jsonschema vs pydantic vs just asserting against the OpenAPI spec?

I need to validate API response structures in pytest tests. Three paths I see: 1. `jsonschema` — explicit, dict-based schema definitions, verbose 2. `pydantic` — nice Python models, easy to assert on attributes, but doubles as production code 3. `openapi-core` or `schemathesis` — validate against the actual OpenAPI spec, most truthful I lean towards option 3 because it means the spec IS the contract. But `schemathesis` feels like a different paradigm (property-based testing) rather than targeted assertions. What do you use for API response validation in your test suite?