diff --git a/scripts/error_analysis.py b/scripts/error_analysis.py
index f7db32d..2d9d7cf 100644
--- a/scripts/error_analysis.py
+++ b/scripts/error_analysis.py
@@ -17,7 +17,6 @@
 
 def analysis(result_file_dir: str, split: Literal["base", "pure"], output_file: str):
     """script to run error analysis fo incorrect TF-Bench tasks"""
-    client = OpenAI()
     tasks = load_tfb_from_hf(split)
     model = basename(abspath(result_file_dir))
 
@@ -36,7 +35,7 @@ def analysis(result_file_dir: str, split: Literal["base", "pure"], output_file:
 
     print(f"Running error classification on {len(incorrect)} incorrect results")
     for task, answer, msg in tqdm(incorrect):
-        error = error_analysis(client, task, answer, error_msg=msg)
+        error = error_analysis(task, answer, error_msg=msg)
         log_obj: ErrorAnalysisResult = {
             "model": model,
             "split": split,
@@ -44,7 +43,6 @@ def analysis(result_file_dir: str, split: Literal["base", "pure"], output_file:
             "ground_truth": task.signature,
             "predicted": answer.answer if answer else None,
             "error_category": error.category,
-            "error_explanation": error.explanation,
         }
         orjsonl.append(output_file, log_obj)
 
diff --git a/src/tfbench/error_analysis.py b/src/tfbench/error_analysis.py
index c71e128..9be0c88 100644
--- a/src/tfbench/error_analysis.py
+++ b/src/tfbench/error_analysis.py
@@ -1,8 +1,7 @@
 from typing import TypedDict, Literal
 
 from pydantic import BaseModel
-from openai import OpenAI
-
+from ollama import chat
 from .common import get_prompt as get_task_prompt, BenchmarkTask
 from .lm import LMAnswer
 
@@ -57,7 +56,6 @@
 The prompt asked to only output the type signature,
 but the answer contains additional text or explanation.
 Choose one category from the above.
-Only output the one-word classification and a short explanation of the why this category fits.
 """
 
 ErrorCategories = Literal[
@@ -74,7 +72,6 @@
 
 class ErrorAnalysisResponse(BaseModel):
     category: ErrorCategories
-    explanation: str
 
 
 def get_error_analysis_prompt(
@@ -92,26 +89,32 @@ def get_error_analysis_prompt(
 
 
 def error_analysis(
-    client: OpenAI,
     task: BenchmarkTask,
     answer: LMAnswer | None,
     error_msg: str,
+    model: str = "qwen3:235b",
 ) -> ErrorAnalysisResponse:
-    """classify errors for all incorrect answers in the run_result"""
+    """classify errors for all incorrect answers in the run_result
+    NOTE: this function uses the OpenAI-compatible API of vLLM.
+    Which model to use is determined by how you serve the model.
+    """
     if answer is None:
-        return ErrorAnalysisResponse(
-            category="ResponseError", explanation="No answer provided."
-        )
-
-    response = client.responses.parse(
-        model="gpt-5",
-        instructions=INSTRUCTION,
-        input=get_error_analysis_prompt(task, answer, error_msg=error_msg),
-        reasoning={"effort": "medium"},
-        text_format=ErrorAnalysisResponse,
+        return ErrorAnalysisResponse(category="ResponseError")
+
+    response = chat(
+        model=model,
+        messages=[
+            {"role": "system", "content": INSTRUCTION},
+            {
+                "role": "user",
+                "content": get_error_analysis_prompt(task, answer, error_msg=error_msg),
+            },
+        ],
+        format=ErrorAnalysisResponse.model_json_schema(),
     )
-    assert response.output_parsed is not None
-    return response.output_parsed
+    content = response.message.content  # type: ignore
+    err = ErrorAnalysisResponse.model_validate_json(content)
+    return err
 
 
 class ErrorAnalysisResult(TypedDict):
@@ -121,4 +124,3 @@ class ErrorAnalysisResult(TypedDict):
     ground_truth: str
     predicted: str | None
     error_category: ErrorCategories
-    error_explanation: str
diff --git a/src/tfbench/lm/_ollama.py b/src/tfbench/lm/_ollama.py
index 9e848e6..2074d26 100644
--- a/src/tfbench/lm/_ollama.py
+++ b/src/tfbench/lm/_ollama.py
@@ -34,6 +34,7 @@ def _gen(self, prompt: str) -> LMAnswer:
                 },
             ],
             think=True,
+            keep_alive=True,
         )
         return LMAnswer(
             answer=response.message.content,  # type: ignore