diff --git a/litellm/main.py b/litellm/main.py
index ddd37b47536..a8f70bcf8e7 100644
--- a/litellm/main.py
+++ b/litellm/main.py
@@ -1045,6 +1045,53 @@ def _build_custom_pricing_entry(
     return entry
 
 
+def _resolve_completion_timeout(
+    timeout: Optional[Union[float, str, httpx.Timeout]],
+    kwargs: dict,
+    custom_llm_provider: str,
+) -> Union[float, httpx.Timeout]:
+    """
+    Resolve timeout inside completion().
+
+    Sources (first match wins):
+
+    - **Model / deployment config:** the `timeout` argument (e.g. from router merging
+      per-model `litellm_params`, including a deployment-level `timeout`).
+    - **Model config alias:** ``kwargs["request_timeout"]`` when the caller passes the
+      per-model ``request_timeout`` field from model config (same idea as deployment
+      `litellm_params.request_timeout`).
+    - **Global proxy settings:** :attr:`litellm.request_timeout`, set from
+      ``litellm_settings.request_timeout`` when the proxy loads config.
+    - **Default:** ``600`` seconds if nothing above is set.
+
+    Also accepts ``kwargs["timeout"]`` as a fallback when the named ``timeout`` argument
+    is omitted.
+
+    If the resolved value is :class:`httpx.Timeout` and the provider does not support
+    passing it through (:func:`litellm.utils.supports_httpx_timeout`), coerce to a
+    float (read timeout, or ``600.0`` if read is unset). Otherwise numeric strings /
+    floats are coerced with ``float(...)``.
+    """
+    if timeout is None:
+        timeout = kwargs.get("timeout")
+    if timeout is None:
+        timeout = kwargs.get("request_timeout")
+    if timeout is None:
+        timeout = getattr(litellm, "request_timeout", None)
+    if timeout is None:
+        timeout = 600
+    if isinstance(timeout, httpx.Timeout) and not supports_httpx_timeout(
+        custom_llm_provider
+    ):
+        read_timeout = timeout.read
+        timeout = (
+            float(read_timeout) if read_timeout is not None else 600.0
+        )  # default 10 min timeout
+    elif not isinstance(timeout, httpx.Timeout):
+        timeout = float(timeout)  # type: ignore
+    return timeout
+
+
 @tracer.wrap()
 @client
 def completion(  # type: ignore # noqa: PLR0915
@@ -1400,14 +1447,11 @@ def completion(  # type: ignore # noqa: PLR0915
             )  # support region-based pricing for bedrock
 
         ### TIMEOUT LOGIC ###
-        timeout = timeout or kwargs.get("request_timeout", 600) or 600
-        # set timeout for 10 minutes by default
-        if isinstance(timeout, httpx.Timeout) and not supports_httpx_timeout(
-            custom_llm_provider
-        ):
-            timeout = timeout.read or 600  # default 10 min timeout
-        elif not isinstance(timeout, httpx.Timeout):
-            timeout = float(timeout)  # type: ignore
+        timeout = _resolve_completion_timeout(
+            timeout=timeout,
+            kwargs=kwargs,
+            custom_llm_provider=custom_llm_provider,
+        )
 
         ### REGISTER CUSTOM MODEL PRICING -- IF GIVEN ###
         if (
@@ -2667,6 +2711,7 @@ def completion(  # type: ignore # noqa: PLR0915
                         provider_config=provider_config,
                     )
                 else:
+                    print("[debug] openai_chat_completions.completion", timeout)
                     response = openai_chat_completions.completion(
                         model=model,
                         messages=messages,
diff --git a/tests/local_testing/test_azure_anthropic_sync_post.py b/tests/local_testing/test_azure_anthropic_sync_post.py
new file mode 100644
index 00000000000..14558d3bffb
--- /dev/null
+++ b/tests/local_testing/test_azure_anthropic_sync_post.py
@@ -0,0 +1,46 @@
+"""
+``_get_httpx_client`` + ``HTTPHandler.post`` (same pattern as Azure Anthropic sync path:
+``_get_httpx_client(params={"timeout": ...})`` then ``post(..., timeout=...)``).
+
+Uses https://httpbin.org/delay/10 with ``timeout=5`` — the handler must raise :class:`~litellm.exceptions.Timeout`
+before the 10s delay completes. Skips if httpbin is unreachable.
+
+Lives under ``local_testing`` (not ``make test-unit``).
+"""
+
+import json
+import os
+import sys
+
+import httpx
+import pytest
+
+sys.path.insert(
+    0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../.."))
+)
+
+from litellm.exceptions import Timeout as LitellmTimeout
+from litellm.llms.custom_httpx.http_handler import _get_httpx_client
+
+_HTTPBIN_DELAY_S = 10
+_PER_REQUEST_TIMEOUT_S = 5.0
+_CLIENT_DEFAULT_TIMEOUT_S = 60.0
+
+
+def test_post_delay_exceeds_per_request_timeout_raises():
+    try:
+        httpx.get("https://httpbin.org/get", timeout=5.0)
+    except Exception as e:
+        pytest.skip(f"httpbin.org unreachable: {e}")
+
+    handler = _get_httpx_client(params={"timeout": _CLIENT_DEFAULT_TIMEOUT_S})
+    try:
+        with pytest.raises(LitellmTimeout):
+            handler.post(
+                f"https://httpbin.org/delay/{_HTTPBIN_DELAY_S}",
+                headers={"content-type": "application/json"},
+                data=json.dumps({"model": "claude", "messages": []}),
+                timeout=_PER_REQUEST_TIMEOUT_S,
+            )
+    finally:
+        handler.close()
diff --git a/tests/test_litellm/llms/azure_ai/claude/test_azure_anthropic_handler.py b/tests/test_litellm/llms/azure_ai/claude/test_azure_anthropic_handler.py
index ddfad420d04..ad86077224a 100644
--- a/tests/test_litellm/llms/azure_ai/claude/test_azure_anthropic_handler.py
+++ b/tests/test_litellm/llms/azure_ai/claude/test_azure_anthropic_handler.py
@@ -222,5 +222,7 @@ class TestAzureAnthropicChatCompletion:
 
         # Verify non-streaming was handled
         mock_client.post.assert_called_once()
+        mock_get_client.assert_called_once_with(params={"timeout": timeout})
+        assert mock_client.post.call_args.kwargs["timeout"] == timeout
         assert result is not None
 
diff --git a/tests/test_litellm/llms/azure_ai/claude/test_main_azure_anthropic_timeout.py b/tests/test_litellm/llms/azure_ai/claude/test_main_azure_anthropic_timeout.py
new file mode 100644
index 00000000000..a94034e5107
--- /dev/null
+++ b/tests/test_litellm/llms/azure_ai/claude/test_main_azure_anthropic_timeout.py
@@ -0,0 +1,42 @@
+"""
+Ensure litellm.completion() forwards timeout to Azure Anthropic handler (main.py dispatch).
+"""
+
+import os
+import sys
+from unittest.mock import MagicMock, patch
+
+sys.path.insert(
+    0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../../../../.."))
+)
+
+from litellm import completion
+from litellm.types.utils import ModelResponse
+
+
+def test_main_azure_ai_claude_completion_passes_timeout_to_azure_anthropic_handler():
+    captured: dict = {}
+
+    def fake_azure_anthropic_completion(**kwargs):
+        captured.update(kwargs)
+        return ModelResponse()
+
+    with patch(
+        "litellm.main.azure_anthropic_chat_completions"
+    ) as mock_azure_anthropic:
+        mock_azure_anthropic.completion = MagicMock(
+            side_effect=fake_azure_anthropic_completion
+        )
+
+        completion(
+            model="azure_ai/claude-sonnet-4-5",
+            messages=[{"role": "user", "content": "hi"}],
+            api_base="https://example.services.ai.azure.com/anthropic",
+            api_key="test-key",
+            timeout=42.5,
+        )
+
+    mock_azure_anthropic.completion.assert_called_once()
+    assert captured["timeout"] == 42.5
+    assert captured["model"] == "claude-sonnet-4-5"
+    assert captured["custom_llm_provider"] == "azure_ai"
diff --git a/tests/test_litellm/llms/custom_httpx/test_http_handler.py b/tests/test_litellm/llms/custom_httpx/test_http_handler.py
index 0a3f0fe5e67..5fad8a99083 100644
--- a/tests/test_litellm/llms/custom_httpx/test_http_handler.py
+++ b/tests/test_litellm/llms/custom_httpx/test_http_handler.py
@@ -15,7 +15,12 @@ sys.path.insert(
 )  # Adds the parent directory to the system path
 import litellm
 from litellm.llms.custom_httpx.aiohttp_transport import LiteLLMAiohttpTransport
-from litellm.llms.custom_httpx.http_handler import AsyncHTTPHandler, get_ssl_configuration
+from litellm.llms.custom_httpx.http_handler import (
+    AsyncHTTPHandler,
+    HTTPHandler,
+    _get_httpx_client,
+    get_ssl_configuration,
+)
 
 
 @pytest.mark.asyncio
@@ -658,3 +663,26 @@ async def test_httpx_handler_uses_env_user_agent(monkeypatch):
         assert req.headers.get("User-Agent") == "Claude Code"
     finally:
         await handler.close()
+
+
+def test_get_httpx_client_applies_float_timeout_without_mocking_handler():
+    """
+    Exercise real _get_httpx_client + HTTPHandler: params={'timeout': x} must reach httpx.Client(timeout=...).
+    Uses an uncommon timeout value to avoid colliding with other cached clients in-process.
+    """
+    timeout = 3847.291
+    handler = _get_httpx_client(params={"timeout": timeout})
+    try:
+        assert isinstance(handler, HTTPHandler)
+        assert handler.client.timeout == httpx.Timeout(timeout)
+    finally:
+        handler.close()
+
+
+def test_get_httpx_client_applies_httpx_timeout_object_without_mocking_handler():
+    t = httpx.Timeout(40.0, connect=5.0)
+    handler = _get_httpx_client(params={"timeout": t})
+    try:
+        assert handler.client.timeout == t
+    finally:
+        handler.close()
diff --git a/tests/test_litellm/test_completion_timeout_resolution.py b/tests/test_litellm/test_completion_timeout_resolution.py
new file mode 100644
index 00000000000..19cd1cef803
--- /dev/null
+++ b/tests/test_litellm/test_completion_timeout_resolution.py
@@ -0,0 +1,93 @@
+"""Unit tests for litellm.main._resolve_completion_timeout (completion() timeout chain)."""
+
+import os
+import sys
+
+import httpx
+
+sys.path.insert(
+    0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../../.."))
+)
+
+import litellm
+from litellm.main import _resolve_completion_timeout
+
+
+def test_explicit_timeout_wins():
+    assert (
+        _resolve_completion_timeout(
+            timeout=12.5,
+            kwargs={"timeout": 99.0, "request_timeout": 88.0},
+            custom_llm_provider="openai",
+        )
+        == 12.5
+    )
+
+
+def test_kwargs_timeout_when_param_none():
+    assert (
+        _resolve_completion_timeout(
+            timeout=None,
+            kwargs={"timeout": 21.0},
+            custom_llm_provider="azure_ai",
+        )
+        == 21.0
+    )
+
+
+def test_request_timeout_alias_in_kwargs():
+    assert (
+        _resolve_completion_timeout(
+            timeout=None,
+            kwargs={"request_timeout": 33.0},
+            custom_llm_provider="bedrock",
+        )
+        == 33.0
+    )
+
+
+def test_litellm_module_request_timeout(monkeypatch):
+    monkeypatch.setattr(litellm, "request_timeout", 360.0)
+    assert (
+        _resolve_completion_timeout(
+            timeout=None,
+            kwargs={},
+            custom_llm_provider="vertex_ai",
+        )
+        == 360.0
+    )
+
+
+def test_fallback_600_when_no_timeout_anywhere(monkeypatch):
+    """600 applies only when named, kwargs, and litellm.request_timeout are all unset."""
+    monkeypatch.setattr(litellm, "request_timeout", None)
+    assert (
+        _resolve_completion_timeout(
+            timeout=None,
+            kwargs={},
+            custom_llm_provider="azure_ai",
+        )
+        == 600.0
+    )
+
+
+def test_httpx_timeout_coerced_for_provider_without_httpx_timeout_support():
+    t = httpx.Timeout(50.0, connect=2.0)
+    out = _resolve_completion_timeout(
+        timeout=t,
+        kwargs={},
+        custom_llm_provider="azure_ai",
+    )
+    assert out == 50.0
+    assert not isinstance(out, httpx.Timeout)
+
+
+def test_httpx_timeout_preserved_for_openai():
+    t = httpx.Timeout(40.0, connect=5.0)
+    out = _resolve_completion_timeout(
+        timeout=t,
+        kwargs={},
+        custom_llm_provider="openai",
+    )
+    assert out is t
+    assert isinstance(out, httpx.Timeout)