diff --git a/providers/zenmux/models/x-ai/grok-4-fast.toml b/providers/zenmux/models/x-ai/grok-4-fast.toml
index bdbe2a6576..a0a2169f49 100644
--- a/providers/zenmux/models/x-ai/grok-4-fast.toml
+++ b/providers/zenmux/models/x-ai/grok-4-fast.toml
@@ -3,6 +3,7 @@ release_date = "2025-09-19"
 last_updated = "2025-09-19"
 attachment = true
 reasoning = true
+reasoning_options = [{ type = "toggle" }]
 temperature = true
 tool_call = true
 knowledge = "2025-01-01"
diff --git a/providers/zenmux/models/x-ai/grok-4.1-fast.toml b/providers/zenmux/models/x-ai/grok-4.1-fast.toml
index 07b9e3bad0..79a1541e72 100644
--- a/providers/zenmux/models/x-ai/grok-4.1-fast.toml
+++ b/providers/zenmux/models/x-ai/grok-4.1-fast.toml
@@ -3,6 +3,7 @@ release_date = "2025-11-20"
 last_updated = "2025-11-20"
 attachment = true
 reasoning = true
+reasoning_options = [{ type = "toggle" }]
 temperature = true
 tool_call = true
 knowledge = "2025-01-01"
diff --git a/providers/zenmux/models/x-ai/grok-4.2-fast.toml b/providers/zenmux/models/x-ai/grok-4.2-fast.toml
index 0f14317b35..41d97333bd 100644
--- a/providers/zenmux/models/x-ai/grok-4.2-fast.toml
+++ b/providers/zenmux/models/x-ai/grok-4.2-fast.toml
@@ -3,6 +3,7 @@ release_date = "2026-03-20"
 last_updated = "2026-03-20"
 attachment = true
 reasoning = true
+reasoning_options = []
 temperature = true
 tool_call = true
 knowledge = "2025-08-31"
diff --git a/providers/zenmux/models/x-ai/grok-4.3.toml b/providers/zenmux/models/x-ai/grok-4.3.toml
index fbeffe1302..455779665f 100644
--- a/providers/zenmux/models/x-ai/grok-4.3.toml
+++ b/providers/zenmux/models/x-ai/grok-4.3.toml
@@ -1,4 +1,5 @@
 base_model = "xai/grok-4.3"
+reasoning_options = [{ type = "effort", values = ["none", "low", "medium", "high"] }]
 
 [cost]
 input = 1.25
diff --git a/providers/zenmux/models/x-ai/grok-4.toml b/providers/zenmux/models/x-ai/grok-4.toml
index 3999283ae9..9a8f79d322 100644
--- a/providers/zenmux/models/x-ai/grok-4.toml
+++ b/providers/zenmux/models/x-ai/grok-4.toml
@@ -3,6 +3,7 @@ release_date = "2025-07-09"
 last_updated = "2025-07-09"
 attachment = true
 reasoning = true
+reasoning_options = []
 temperature = true
 tool_call = true
 knowledge = "2025-01-01"
diff --git a/providers/zenmux/models/x-ai/grok-build-0.1.toml b/providers/zenmux/models/x-ai/grok-build-0.1.toml
index 860637c952..59480b618c 100644
--- a/providers/zenmux/models/x-ai/grok-build-0.1.toml
+++ b/providers/zenmux/models/x-ai/grok-build-0.1.toml
@@ -1,4 +1,5 @@
 base_model = "xai/grok-build-0.1"
+reasoning_options = []
 
 [cost]
 input = 1.00
diff --git a/providers/zenmux/models/x-ai/grok-code-fast-1.toml b/providers/zenmux/models/x-ai/grok-code-fast-1.toml
index 5b69bcd658..3fc7400a2e 100644
--- a/providers/zenmux/models/x-ai/grok-code-fast-1.toml
+++ b/providers/zenmux/models/x-ai/grok-code-fast-1.toml
@@ -3,6 +3,7 @@ release_date = "2025-08-26"
 last_updated = "2025-08-26"
 attachment = false
 reasoning = true
+reasoning_options = []
 temperature = true
 tool_call = true
 knowledge = "2025-01-01"