diff --git a/crates/tui/src/client.rs b/crates/tui/src/client.rs
index f7eb50b8..93f722d6 100644
--- a/crates/tui/src/client.rs
+++ b/crates/tui/src/client.rs
@@ -1226,7 +1226,8 @@ pub(super) fn apply_reasoning_effort(
             | ApiProvider::SiliconflowCn
             | ApiProvider::Sglang
             | ApiProvider::Volcengine
-            | ApiProvider::Together => {
+            | ApiProvider::Together
+            | ApiProvider::Atlascloud => {
                 body["thinking"] = json!({ "type": "disabled" });
             }
             ApiProvider::OpenaiCodex => {
@@ -1248,12 +1249,17 @@ pub(super) fn apply_reasoning_effort(
                 });
             }
             ApiProvider::Openai
-            | ApiProvider::Atlascloud
             | ApiProvider::WanjieArk
             | ApiProvider::Arcee
-            | ApiProvider::Huggingface
-            | ApiProvider::Moonshot
-            | ApiProvider::Ollama => {}
+            | ApiProvider::Huggingface => {}
+            ApiProvider::Moonshot => {
+                // #3024: Kimi models accept thinking enable/disable.
+                body["thinking"] = json!({ "type": "disabled" });
+            }
+            ApiProvider::Ollama => {
+                // #3024: Ollama OpenAI-compat endpoint accepts think param.
+                body["think"] = json!(false);
+            }
             ApiProvider::NvidiaNim => {
                 body["chat_template_kwargs"] = json!({
                     "thinking": false,
@@ -1267,7 +1273,8 @@ pub(super) fn apply_reasoning_effort(
             | ApiProvider::Siliconflow
             | ApiProvider::SiliconflowCn
             | ApiProvider::Sglang
-            | ApiProvider::Volcengine => {
+            | ApiProvider::Volcengine
+            | ApiProvider::Atlascloud => {
                 body["reasoning_effort"] = json!("high");
                 body["thinking"] = json!({ "type": "enabled" });
             }
@@ -1311,12 +1318,15 @@ pub(super) fn apply_reasoning_effort(
                 };
                 body["reasoning_effort"] = json!(value);
             }
-            ApiProvider::Openai
-            | ApiProvider::Atlascloud
-            | ApiProvider::WanjieArk
-            | ApiProvider::Moonshot
-            | ApiProvider::Ollama
-            | ApiProvider::OpenaiCodex => {}
+            ApiProvider::Openai | ApiProvider::WanjieArk | ApiProvider::OpenaiCodex => {}
+            ApiProvider::Moonshot => {
+                // #3024: Kimi models accept thinking enable.
+                body["thinking"] = json!({ "type": "enabled" });
+            }
+            ApiProvider::Ollama => {
+                // #3024: Ollama think param.
+                body["think"] = json!(true);
+            }
             ApiProvider::NvidiaNim => {
                 body["chat_template_kwargs"] = json!({
                     "thinking": true,
@@ -1330,7 +1340,8 @@ pub(super) fn apply_reasoning_effort(
             | ApiProvider::Siliconflow
             | ApiProvider::SiliconflowCn
             | ApiProvider::Sglang
-            | ApiProvider::Volcengine => {
+            | ApiProvider::Volcengine
+            | ApiProvider::Atlascloud => {
                 body["reasoning_effort"] = json!("max");
                 body["thinking"] = json!({ "type": "enabled" });
             }
@@ -1355,12 +1366,15 @@ pub(super) fn apply_reasoning_effort(
                 // "max" to "high" instead of sending an invalid value.
                 body["reasoning_effort"] = json!("high");
             }
-            ApiProvider::Openai
-            | ApiProvider::Atlascloud
-            | ApiProvider::WanjieArk
-            | ApiProvider::Moonshot
-            | ApiProvider::Ollama
-            | ApiProvider::OpenaiCodex => {}
+            ApiProvider::Openai | ApiProvider::WanjieArk | ApiProvider::OpenaiCodex => {}
+            ApiProvider::Moonshot => {
+                // #3024: Kimi models accept thinking enable.
+                body["thinking"] = json!({ "type": "enabled" });
+            }
+            ApiProvider::Ollama => {
+                // #3024: Ollama think param.
+                body["think"] = json!(true);
+            }
             ApiProvider::NvidiaNim => {
                 body["chat_template_kwargs"] = json!({
                     "thinking": true,
@@ -2543,12 +2557,9 @@ mod tests {
     fn reasoning_effort_off_is_omitted_for_strict_openai_like_providers() {
         for provider in [
             ApiProvider::Openai,
-            ApiProvider::Atlascloud,
             ApiProvider::WanjieArk,
             ApiProvider::Arcee,
             ApiProvider::Huggingface,
-            ApiProvider::Moonshot,
-            ApiProvider::Ollama,
             ApiProvider::Fireworks,
         ] {
             let mut body = json!({});
@@ -2562,6 +2573,49 @@ mod tests {
         }
     }
 
+    #[test]
+    fn reasoning_effort_atlascloud_speaks_deepseek_dialect() {
+        let mut body = json!({});
+        apply_reasoning_effort(&mut body, Some("high"), ApiProvider::Atlascloud);
+        assert_eq!(
+            body,
+            json!({ "reasoning_effort": "high", "thinking": { "type": "enabled" } })
+        );
+
+        let mut body = json!({});
+        apply_reasoning_effort(&mut body, Some("max"), ApiProvider::Atlascloud);
+        assert_eq!(
+            body,
+            json!({ "reasoning_effort": "max", "thinking": { "type": "enabled" } })
+        );
+
+        let mut body = json!({});
+        apply_reasoning_effort(&mut body, Some("off"), ApiProvider::Atlascloud);
+        assert_eq!(body, json!({ "thinking": { "type": "disabled" } }));
+    }
+
+    #[test]
+    fn reasoning_effort_moonshot_toggles_thinking() {
+        let mut body = json!({});
+        apply_reasoning_effort(&mut body, Some("high"), ApiProvider::Moonshot);
+        assert_eq!(body, json!({ "thinking": { "type": "enabled" } }));
+
+        let mut body = json!({});
+        apply_reasoning_effort(&mut body, Some("off"), ApiProvider::Moonshot);
+        assert_eq!(body, json!({ "thinking": { "type": "disabled" } }));
+    }
+
+    #[test]
+    fn reasoning_effort_ollama_toggles_think_flag() {
+        let mut body = json!({});
+        apply_reasoning_effort(&mut body, Some("high"), ApiProvider::Ollama);
+        assert_eq!(body, json!({ "think": true }));
+
+        let mut body = json!({});
+        apply_reasoning_effort(&mut body, Some("off"), ApiProvider::Ollama);
+        assert_eq!(body, json!({ "think": false }));
+    }
+
     #[test]
     fn reasoning_effort_uses_nvidia_nim_chat_template_kwargs() {
         let mut body = json!({});
diff --git a/docs/PROVIDERS.md b/docs/PROVIDERS.md
index 89556be3..d514f6a5 100644
--- a/docs/PROVIDERS.md
+++ b/docs/PROVIDERS.md
@@ -283,6 +283,30 @@ DeepSeek compatibility aliases `deepseek-chat` and `deepseek-reasoner` map to
 `deepseek-v4-flash` capability metadata and are scheduled to retire on
 2026-07-24 at 2026-07-24T15:59:00Z.
 
+## Reasoning Effort
+
+`/reasoning <effort>` (and the `reasoning_effort` config key) is translated to
+each provider's wire dialect by the client before the request is sent. `off`
+disables thinking where the dialect supports it; providers marked "omitted"
+receive no reasoning fields at all for that tier.
+
+| Provider | `off` | `low`/`medium`/`high` | `max`/`xhigh` |
+| --- | --- | --- | --- |
+| `deepseek`, `deepseek-cn`, `siliconflow`, `siliconflow-CN`, `sglang`, `volcengine`, `atlascloud` | `thinking: {type: disabled}` | `reasoning_effort: "high"` + `thinking: {type: enabled}` | `reasoning_effort: "max"` + `thinking: {type: enabled}` |
+| `openrouter`, `novita`, `together` | `thinking: {type: disabled}` | `reasoning_effort` pass-through + `thinking: {type: enabled}` | `reasoning_effort: "xhigh"` + `thinking: {type: enabled}` |
+| `moonshot` | `thinking: {type: disabled}` | `thinking: {type: enabled}` | `thinking: {type: enabled}` |
+| `ollama` | `think: false` | `think: true` | `think: true` |
+| `xiaomi-mimo` | `thinking: {type: disabled}` | `thinking: {type: enabled}` | `thinking: {type: enabled}` |
+| `nvidia-nim` | `chat_template_kwargs.thinking: false` | `chat_template_kwargs`: `thinking: true` + `reasoning_effort: "high"` | `chat_template_kwargs`: `thinking: true` + `reasoning_effort: "max"` |
+| `vllm` | `chat_template_kwargs.enable_thinking: false` | `chat_template_kwargs.enable_thinking: true` + `reasoning_effort` low/medium/high | `chat_template_kwargs.enable_thinking: true` + `reasoning_effort: "high"` (vLLM has no max tier) |
+| `arcee`, `huggingface` | omitted | `reasoning_effort` pass-through | `reasoning_effort: "high"` |
+| `fireworks` | omitted | `reasoning_effort: "high"` | `reasoning_effort: "max"` |
+| `openai`, `wanjie-ark` | omitted | omitted | omitted |
+| `openai-codex` | Responses API `reasoning` field (handled by the Responses bridge) | Responses API `reasoning` field | Responses API `reasoning` field |
+
+AtlasCloud serves DeepSeek models, so it speaks the DeepSeek reasoning dialect,
+including the `max` tier (#3024).
+
 ## Drift Check
 
 Run this before changing provider IDs, provider TOML tables, static model