[CI] Add GPT-OSS Eval job for H100 (#34359)

Signed-off-by: Michael Goin <mgoin64@gmail.com>

.buildkite/test_areas/misc.yaml

@@ -147,6 +147,19 @@ steps:
   - pytest -v -s transformers_utils
   - pytest -v -s config
 
+- label: GPT-OSS Eval (H100)
+  timeout_in_minutes: 60
+  working_dir: "/vllm-workspace/"
+  device: h100
+  optional: true
+  source_file_dependencies:
+  - tests/evals/gpt_oss
+  - vllm/model_executor/models/gpt_oss.py
+  - vllm/model_executor/layers/quantization/mxfp4.py
+  commands:
+    - uv pip install --system 'gpt-oss[eval]==0.0.5'
+    - pytest -s -v tests/evals/gpt_oss/test_gpqa_correctness.py --model openai/gpt-oss-20b --metric 0.58
+
 - label: GPT-OSS Eval (B200)
   timeout_in_minutes: 60
   working_dir: "/vllm-workspace/"