diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 6e41e12dfce..50a4af056b3 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -105,6 +105,7 @@ Release tarball changes:
 - ✨ Use self-hosted runners for fixture building in CI ([#1051](https://github.com/ethereum/execution-spec-tests/pull/1051)).
 - ✨ Release tarballs now contain fixtures filled for all forks, not only the fork under active development and the fork currently deployed on mainnet ([#1053](https://github.com/ethereum/execution-spec-tests/pull/1053)).
 - ✨ `StateTest` fixture format now contains `state` field in each network post result, containing the decoded post allocation that results from the transaction execution ([#1064](https://github.com/ethereum/execution-spec-tests/pull/1064)).
+- ✨ Include EELS fork resolution information in filled json test fixtures ([#1123](https://github.com/ethereum/execution-spec-tests/pull/1123)).
 
 ### 💥 Breaking Change
 
diff --git a/src/ethereum_clis/transition_tool.py b/src/ethereum_clis/transition_tool.py
index 6614b1928e2..89bb85fdbcb 100644
--- a/src/ethereum_clis/transition_tool.py
+++ b/src/ethereum_clis/transition_tool.py
@@ -72,6 +72,7 @@ def __init__(
         self.exception_mapper = exception_mapper
         super().__init__(binary=binary)
         self.trace = trace
+        self._info_metadata: Optional[Dict[str, Any]] = {}
 
     def __init_subclass__(cls):
         """Register all subclasses of TransitionTool as possible tools."""
@@ -342,7 +343,12 @@ def _evaluate_server(
         response = self._server_post(
             data=request_data_json, url_args=self._generate_post_args(t8n_data), timeout=timeout
         )
-        output: TransitionToolOutput = TransitionToolOutput.model_validate(response.json())
+        response_json = response.json()
+
+        # pop optional test ``_info`` metadata from response, if present
+        self._info_metadata = response_json.pop("_info_metadata", {})
+
+        output: TransitionToolOutput = TransitionToolOutput.model_validate(response_json)
 
         if debug_output_path:
             response_info = (
diff --git a/src/ethereum_test_base_types/reference_spec/git_reference_spec.py b/src/ethereum_test_base_types/reference_spec/git_reference_spec.py
index 45ec4eb6e0a..a74fd9fc91e 100644
--- a/src/ethereum_test_base_types/reference_spec/git_reference_spec.py
+++ b/src/ethereum_test_base_types/reference_spec/git_reference_spec.py
@@ -96,7 +96,7 @@ def has_known_version(self) -> bool:
         """
         return self.SpecVersion != ""
 
-    def write_info(self, info: Dict[str, str]):
+    def write_info(self, info: Dict[str, Dict[str, Any] | str]):
         """
         Write info about the reference specification used into the output
         fixture.
diff --git a/src/ethereum_test_base_types/reference_spec/reference_spec.py b/src/ethereum_test_base_types/reference_spec/reference_spec.py
index 10e86a4ce1b..1da8820cec8 100644
--- a/src/ethereum_test_base_types/reference_spec/reference_spec.py
+++ b/src/ethereum_test_base_types/reference_spec/reference_spec.py
@@ -63,7 +63,7 @@ def is_outdated(self) -> bool:
         pass
 
     @abstractmethod
-    def write_info(self, info: Dict[str, str]):
+    def write_info(self, info: Dict[str, Dict[str, Any] | str]):
         """Write info about the reference specification used into the output fixture."""
         pass
 
diff --git a/src/ethereum_test_fixtures/base.py b/src/ethereum_test_fixtures/base.py
index 922d12760e5..cbc971d84a9 100644
--- a/src/ethereum_test_fixtures/base.py
+++ b/src/ethereum_test_fixtures/base.py
@@ -14,7 +14,7 @@
 class BaseFixture(CamelModel):
     """Represents a base Ethereum test fixture of any type."""
 
-    info: Dict[str, str] = Field(default_factory=dict, alias="_info")
+    info: Dict[str, Dict[str, Any] | str] = Field(default_factory=dict, alias="_info")
 
     # Fixture format properties
     fixture_format_name: ClassVar[str] = "unset"
@@ -52,6 +52,7 @@ def fill_info(
         test_case_description: str,
         fixture_source_url: str,
         ref_spec: ReferenceSpec | None,
+        _info_metadata: Dict[str, Any],
     ):
         """Fill the info field for this fixture."""
         if "comment" not in self.info:
@@ -62,6 +63,8 @@ def fill_info(
         self.info["fixture_format"] = self.fixture_format_name
         if ref_spec is not None:
             ref_spec.write_info(self.info)
+        if _info_metadata:
+            self.info.update(_info_metadata)
 
     def get_fork(self) -> str | None:
         """Return fork of the fixture as a string."""
diff --git a/src/pytest_plugins/filler/filler.py b/src/pytest_plugins/filler/filler.py
index 3e945ed0a68..a3c4dac5c8b 100644
--- a/src/pytest_plugins/filler/filler.py
+++ b/src/pytest_plugins/filler/filler.py
@@ -679,6 +679,7 @@ def __init__(self, *args, **kwargs):
                     test_case_description,
                     fixture_source_url=fixture_source_url,
                     ref_spec=reference_spec,
+                    _info_metadata=t8n._info_metadata,
                 )
 
                 fixture_path = fixture_collector.add_fixture(