diff --git a/packages/opentelemetry-instrumentation-openai/opentelemetry/instrumentation/openai/shared/__init__.py b/packages/opentelemetry-instrumentation-openai/opentelemetry/instrumentation/openai/shared/__init__.py
index 1d03297395..a27b1bcf81 100644
--- a/packages/opentelemetry-instrumentation-openai/opentelemetry/instrumentation/openai/shared/__init__.py
+++ b/packages/opentelemetry-instrumentation-openai/opentelemetry/instrumentation/openai/shared/__init__.py
@@ -12,6 +12,7 @@
 )
 from opentelemetry.semconv._incubating.attributes import (
     gen_ai_attributes as GenAIAttributes,
+    openai_attributes as OpenAIAttributes,
 )
 from opentelemetry.semconv_ai import SpanAttributes
 from opentelemetry.trace.propagation import set_span_in_context
@@ -141,6 +142,9 @@ def _set_request_attributes(span, kwargs, instance=None):
     _set_span_attribute(
         span, SpanAttributes.LLM_IS_STREAMING, kwargs.get("stream") or False
     )
+    _set_span_attribute(
+        span, OpenAIAttributes.OPENAI_REQUEST_SERVICE_TIER, kwargs.get("service_tier")
+    )
     if response_format := kwargs.get("response_format"):
         # backward-compatible check for
         # openai.types.shared_params.response_format_json_schema.ResponseFormatJSONSchema
@@ -210,6 +214,11 @@ def _set_response_attributes(span, response):
         SpanAttributes.LLM_OPENAI_RESPONSE_SYSTEM_FINGERPRINT,
         response.get("system_fingerprint"),
     )
+    _set_span_attribute(
+        span,
+        OpenAIAttributes.OPENAI_RESPONSE_SERVICE_TIER,
+        response.get("service_tier"),
+    )
     _log_prompt_filter(span, response)
     usage = response.get("usage")
     if not usage:
diff --git a/packages/opentelemetry-instrumentation-openai/opentelemetry/instrumentation/openai/v1/responses_wrappers.py b/packages/opentelemetry-instrumentation-openai/opentelemetry/instrumentation/openai/v1/responses_wrappers.py
index 36f603fc4b..1c3d78d0bb 100644
--- a/packages/opentelemetry-instrumentation-openai/opentelemetry/instrumentation/openai/v1/responses_wrappers.py
+++ b/packages/opentelemetry-instrumentation-openai/opentelemetry/instrumentation/openai/v1/responses_wrappers.py
@@ -42,6 +42,7 @@
 from opentelemetry.instrumentation.utils import _SUPPRESS_INSTRUMENTATION_KEY
 from opentelemetry.semconv._incubating.attributes import (
     gen_ai_attributes as GenAIAttributes,
+    openai_attributes as OpenAIAttributes,
 )
 from opentelemetry.semconv_ai import SpanAttributes
 from opentelemetry.semconv.attributes.error_attributes import ERROR_TYPE
@@ -132,6 +133,10 @@ class TracedData(pydantic.BaseModel):
     request_reasoning_effort: Optional[str] = pydantic.Field(default=None)
     response_reasoning_effort: Optional[str] = pydantic.Field(default=None)
 
+    # OpenAI service tier
+    request_service_tier: Optional[str] = pydantic.Field(default=None)
+    response_service_tier: Optional[str] = pydantic.Field(default=None)
+
 
 responses: dict[str, TracedData] = {}
 
@@ -189,6 +194,8 @@ def set_data_attributes(traced_response: TracedData, span: Span):
     _set_span_attribute(span, GenAIAttributes.GEN_AI_REQUEST_MODEL, traced_response.request_model)
     _set_span_attribute(span, GenAIAttributes.GEN_AI_RESPONSE_ID, traced_response.response_id)
     _set_span_attribute(span, GenAIAttributes.GEN_AI_RESPONSE_MODEL, traced_response.response_model)
+    _set_span_attribute(span, OpenAIAttributes.OPENAI_REQUEST_SERVICE_TIER, traced_response.request_service_tier)
+    _set_span_attribute(span, OpenAIAttributes.OPENAI_RESPONSE_SERVICE_TIER, traced_response.response_service_tier)
     if usage := traced_response.usage:
         _set_span_attribute(span, GenAIAttributes.GEN_AI_USAGE_INPUT_TOKENS, usage.input_tokens)
         _set_span_attribute(span, GenAIAttributes.GEN_AI_USAGE_OUTPUT_TOKENS, usage.output_tokens)
@@ -483,6 +490,8 @@ def responses_get_or_create_wrapper(tracer: Tracer, wrapped, instance, args, kwa
                     )
                 ),
                 response_reasoning_effort=kwargs.get("reasoning", {}).get("effort"),
+                request_service_tier=kwargs.get("service_tier"),
+                response_service_tier=existing_data.get("response_service_tier"),
             )
         except Exception:
             traced_data = None
@@ -546,6 +555,8 @@ def responses_get_or_create_wrapper(tracer: Tracer, wrapped, instance, args, kwa
                 )
             ),
             response_reasoning_effort=kwargs.get("reasoning", {}).get("effort"),
+            request_service_tier=existing_data.get("request_service_tier", kwargs.get("service_tier")),
+            response_service_tier=existing_data.get("response_service_tier", parsed_response.service_tier),
         )
         responses[parsed_response.id] = traced_data
     except Exception:
@@ -621,6 +632,8 @@ async def async_responses_get_or_create_wrapper(
                     )
                 ),
                 response_reasoning_effort=kwargs.get("reasoning", {}).get("effort"),
+                request_service_tier=kwargs.get("service_tier"),
+                response_service_tier=existing_data.get("response_service_tier"),
             )
         except Exception:
             traced_data = None
@@ -685,6 +698,8 @@ async def async_responses_get_or_create_wrapper(
                 )
             ),
             response_reasoning_effort=kwargs.get("reasoning", {}).get("effort"),
+            request_service_tier=existing_data.get("request_service_tier", kwargs.get("service_tier")),
+            response_service_tier=existing_data.get("response_service_tier", parsed_response.service_tier),
         )
         responses[parsed_response.id] = traced_data
     except Exception:
@@ -791,6 +806,8 @@ def __init__(
             ),
             request_reasoning_effort=self._request_kwargs.get("reasoning", {}).get("effort"),
             response_reasoning_effort=None,
+            request_service_tier=self._request_kwargs.get("service_tier"),
+            response_service_tier=None,
         )
 
         self._complete_response_data = None
diff --git a/packages/opentelemetry-instrumentation-openai/tests/traces/cassettes/test_chat/test_chat_with_service_tier.yaml b/packages/opentelemetry-instrumentation-openai/tests/traces/cassettes/test_chat/test_chat_with_service_tier.yaml
new file mode 100644
index 0000000000..07a4a9d1e7
--- /dev/null
+++ b/packages/opentelemetry-instrumentation-openai/tests/traces/cassettes/test_chat/test_chat_with_service_tier.yaml
@@ -0,0 +1,113 @@
+interactions:
+- request:
+    body: '{"messages": [{"role": "user", "content": "Say hello"}], "model": "gpt-5",
+      "service_tier": "priority"}'
+    headers:
+      accept:
+      - application/json
+      accept-encoding:
+      - gzip, deflate
+      connection:
+      - keep-alive
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+      - api.openai.com
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+      x-stainless-arch:
+      - arm64
+      x-stainless-async:
+      - 'false'
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+      - python
+      x-stainless-os:
+      - MacOS
+      x-stainless-package-version:
+      - 1.99.7
+      x-stainless-read-timeout:
+      - '600'
+      x-stainless-retry-count:
+      - '0'
+      x-stainless-runtime:
+      - CPython
+      x-stainless-runtime-version:
+      - 3.9.6
+    method: POST
+    uri: https://api.openai.com/v1/chat/completions
+  response:
+    body:
+      string: !!binary |
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diff --git a/packages/opentelemetry-instrumentation-openai/tests/traces/cassettes/test_responses/test_responses_with_service_tier.yaml b/packages/opentelemetry-instrumentation-openai/tests/traces/cassettes/test_responses/test_responses_with_service_tier.yaml
new file mode 100644
index 0000000000..f535f6265e
--- /dev/null
+++ b/packages/opentelemetry-instrumentation-openai/tests/traces/cassettes/test_responses/test_responses_with_service_tier.yaml
@@ -0,0 +1,110 @@
+interactions:
+- request:
+    body: '{"input": "Say hello", "model": "gpt-5", "service_tier": "priority"}'
+    headers:
+      accept:
+      - application/json
+      accept-encoding:
+      - gzip, deflate
+      connection:
+      - keep-alive
+      content-length:
+      - '68'
+      content-type:
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+      host:
+      - api.openai.com
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+      - '600'
+      x-stainless-retry-count:
+      - '0'
+      x-stainless-runtime:
+      - CPython
+      x-stainless-runtime-version:
+      - 3.9.6
+    method: POST
+    uri: https://api.openai.com/v1/responses
+  response:
+    body:
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diff --git a/packages/opentelemetry-instrumentation-openai/tests/traces/test_chat.py b/packages/opentelemetry-instrumentation-openai/tests/traces/test_chat.py
index a93b939a42..2d14b46db6 100644
--- a/packages/opentelemetry-instrumentation-openai/tests/traces/test_chat.py
+++ b/packages/opentelemetry-instrumentation-openai/tests/traces/test_chat.py
@@ -1497,6 +1497,27 @@ def test_chat_reasoning(instrument_legacy, span_exporter,
     assert span.attributes["gen_ai.usage.reasoning_tokens"] > 0
 
 
+@pytest.mark.vcr
+def test_chat_with_service_tier(instrument_legacy, span_exporter, openai_client):
+    openai_client.chat.completions.create(
+        model="gpt-5",
+        messages=[
+            {
+                "role": "user",
+                "content": "Say hello"
+            }
+        ],
+        service_tier="priority",
+    )
+
+    spans = span_exporter.get_finished_spans()
+    assert len(spans) >= 1
+    span = spans[-1]
+
+    assert span.attributes["openai.request.service_tier"] == "priority"
+    assert span.attributes["openai.response.service_tier"] == "priority"
+
+
 def test_chat_exception(instrument_legacy, span_exporter, openai_client):
     openai_client.api_key = "invalid"
     with pytest.raises(Exception):
diff --git a/packages/opentelemetry-instrumentation-openai/tests/traces/test_responses.py b/packages/opentelemetry-instrumentation-openai/tests/traces/test_responses.py
index e9b1f267e4..043ecccf68 100644
--- a/packages/opentelemetry-instrumentation-openai/tests/traces/test_responses.py
+++ b/packages/opentelemetry-instrumentation-openai/tests/traces/test_responses.py
@@ -29,6 +29,23 @@ def test_responses(
     # assert span.attributes["gen_ai.prompt.0.role"] == "user"
 
 
+@pytest.mark.vcr
+def test_responses_with_service_tier(
+    instrument_legacy, span_exporter: InMemorySpanExporter, openai_client: OpenAI
+):
+    _ = openai_client.responses.create(
+        model="gpt-5",
+        input="Say hello",
+        service_tier="priority",
+    )
+    spans = span_exporter.get_finished_spans()
+    assert len(spans) == 1
+    span = spans[0]
+    assert span.name == "openai.response"
+    assert span.attributes["openai.request.service_tier"] == "priority"
+    assert span.attributes["openai.response.service_tier"] == "priority"
+
+
 @pytest.mark.vcr
 def test_responses_with_input_history(
     instrument_legacy, span_exporter: InMemorySpanExporter, openai_client: OpenAI