diff --git a/evals/solvers/providers/anthropic/anthropic_solver.py b/evals/solvers/providers/anthropic/anthropic_solver.py
index bb7fe50e24..e0cdbebc74 100644
--- a/evals/solvers/providers/anthropic/anthropic_solver.py
+++ b/evals/solvers/providers/anthropic/anthropic_solver.py
@@ -2,7 +2,7 @@
 
 import anthropic
 from anthropic import Anthropic
-from anthropic.types import ContentBlock, MessageParam, Usage
+from anthropic.types import MessageParam, TextBlock, Usage
 
 from evals.record import record_sampling
 from evals.solvers.solver import Solver, SolverResult
@@ -99,7 +99,7 @@ def _convert_msgs_to_anthropic_format(msgs: list[Message]) -> list[MessageParam]
         anth_msgs = [
             MessageParam(
                 role=oai_to_anthropic_role[msg.role],
-                content=[ContentBlock(text=msg.content, type="text")],
+                content=[TextBlock(text=msg.content, type="text")],
             )
             for msg in msgs
         ]
diff --git a/evals/solvers/providers/anthropic/anthropic_solver_test.py b/evals/solvers/providers/anthropic/anthropic_solver_test.py
index 9ba8fb1470..864c67d073 100644
--- a/evals/solvers/providers/anthropic/anthropic_solver_test.py
+++ b/evals/solvers/providers/anthropic/anthropic_solver_test.py
@@ -1,14 +1,11 @@
 import os
+
 import pytest
+from anthropic.types import MessageParam, TextBlock, Usage
 
 from evals.record import DummyRecorder
+from evals.solvers.providers.anthropic.anthropic_solver import AnthropicSolver, anth_to_openai_usage
 from evals.task_state import Message, TaskState
-from evals.solvers.providers.anthropic.anthropic_solver import (
-    AnthropicSolver,
-    anth_to_openai_usage,
-)
-
-from anthropic.types import ContentBlock, MessageParam, Usage
 
 IN_GITHUB_ACTIONS = os.getenv("GITHUB_ACTIONS") == "true"
 MODEL_NAME = "claude-instant-1.2"
@@ -32,9 +29,7 @@ def dummy_recorder():
         yield recorder
 
 
-@pytest.mark.skipif(
-    IN_GITHUB_ACTIONS, reason="API tests are wasteful to run on every commit."
-)
+@pytest.mark.skipif(IN_GITHUB_ACTIONS, reason="API tests are wasteful to run on every commit.")
 def test_solver(dummy_recorder, anthropic_solver):
     """
     Test that the solver generates a response coherent with the message history
@@ -55,9 +50,7 @@ def test_solver(dummy_recorder, anthropic_solver):
     )
 
     solver_res = solver(task_state=task_state)
-    assert (
-        solver_res.output == answer
-    ), f"Expected '{answer}', but got {solver_res.output}"
+    assert solver_res.output == answer, f"Expected '{answer}', but got {solver_res.output}"
 
 
 def test_message_format():
@@ -71,9 +64,7 @@ def test_message_format():
     msgs = [
         Message(role="user", content="What is 2 + 2?"),
         Message(role="system", content="reason step by step"),
-        Message(
-            role="assistant", content="I don't need to reason for this, 2+2 is just 4"
-        ),
+        Message(role="assistant", content="I don't need to reason for this, 2+2 is just 4"),
         Message(role="system", content="now, given your reasoning, provide the answer"),
     ]
     anth_msgs = AnthropicSolver._convert_msgs_to_anthropic_format(msgs)
@@ -82,24 +73,20 @@ def test_message_format():
         MessageParam(
             role="user",
             content=[
-                ContentBlock(text="What is 2 + 2?", type="text"),
-                ContentBlock(text="reason step by step", type="text"),
+                TextBlock(text="What is 2 + 2?", type="text"),
+                TextBlock(text="reason step by step", type="text"),
             ],
         ),
         MessageParam(
             role="assistant",
             content=[
-                ContentBlock(
-                    text="I don't need to reason for this, 2+2 is just 4", type="text"
-                ),
+                TextBlock(text="I don't need to reason for this, 2+2 is just 4", type="text"),
             ],
         ),
         MessageParam(
             role="user",
             content=[
-                ContentBlock(
-                    text="now, given your reasoning, provide the answer", type="text"
-                ),
+                TextBlock(text="now, given your reasoning, provide the answer", type="text"),
             ],
         ),
     ]
@@ -126,6 +113,4 @@ def test_anth_to_openai_usage_zero_tokens():
         "prompt_tokens": 0,
         "total_tokens": 0,
     }
-    assert (
-        anth_to_openai_usage(usage) == expected
-    ), "Zero token cases are not handled correctly."
+    assert anth_to_openai_usage(usage) == expected, "Zero token cases are not handled correctly."