diff --git a/scripts/jax_assertions/fitness_dispatch.py b/scripts/jax_assertions/fitness_dispatch.py
index a0a1a48..1285a8b 100644
--- a/scripts/jax_assertions/fitness_dispatch.py
+++ b/scripts/jax_assertions/fitness_dispatch.py
@@ -91,6 +91,42 @@ def assert_fit_for_visualization_dispatches_through_jit_when_flag_set():
     assert jnp.allclose(result_2, jnp.asarray(6.0))
 
 
+def assert_use_jax_true_implicitly_turns_on_visualization():
+    """Sentinel default: ``Analysis(use_jax=True)`` with no explicit
+    ``use_jax_for_visualization`` argument resolves to the JIT visualization
+    path. Validates that PyAutoFit's ``Analysis.__init__`` treats
+    ``use_jax_for_visualization=None`` as "follow ``use_jax``"."""
+    analysis = af.Analysis(use_jax=True)
+    assert analysis._use_jax is True
+    assert analysis._use_jax_for_visualization is True
+
+
+def assert_explicit_false_opts_out_when_use_jax_true():
+    """Users can force the eager NumPy plotter alongside JAX likelihoods by
+    passing ``use_jax_for_visualization=False`` explicitly."""
+    analysis = af.Analysis(use_jax=True, use_jax_for_visualization=False)
+    assert analysis._use_jax is True
+    assert analysis._use_jax_for_visualization is False
+
+
+def assert_explicit_none_resolves_to_use_jax():
+    """Passing ``None`` explicitly is identical to omitting the argument."""
+    analysis = af.Analysis(use_jax=True, use_jax_for_visualization=None)
+    assert analysis._use_jax_for_visualization is True
+
+
+def assert_use_jax_true_jit_dispatch_via_sentinel_default():
+    """End-to-end: ``Analysis(use_jax=True)`` with sentinel default still wires
+    the JIT dispatch in ``fit_for_visualization`` — the previous assertion at
+    the top of this section did the equivalent with the flag set explicitly;
+    this one confirms the same behaviour when relying on the new default."""
+    analysis = _JitFittableAnalysis(use_jax=True)
+    assert getattr(analysis, "_jitted_fit_from", None) is None
+    result = analysis.fit_for_visualization(instance=2.0)
+    assert analysis._jitted_fit_from is not None
+    assert jnp.allclose(result, jnp.asarray(4.0))
+
+
 class _ArrayAnalysis(af.Analysis):
     def log_likelihood_function(self, instance):
         return -float(
@@ -140,5 +176,9 @@ def assert_array_optimisation_returns_jnp_instance():
     assert_vmap_takes_precedence_over_jit()
     assert_pickle_strips_jax_cached_attrs()
     assert_fit_for_visualization_dispatches_through_jit_when_flag_set()
+    assert_use_jax_true_implicitly_turns_on_visualization()
+    assert_explicit_false_opts_out_when_use_jax_true()
+    assert_explicit_none_resolves_to_use_jax()
+    assert_use_jax_true_jit_dispatch_via_sentinel_default()
     assert_array_optimisation_returns_jnp_instance()
     print("fitness_dispatch: all assertions passed")