diff --git a/litellm-rust/crates/gateway/tests/server.rs b/litellm-rust/crates/gateway/tests/server.rs
index 1431027a35a..b9e510f6713 100644
--- a/litellm-rust/crates/gateway/tests/server.rs
+++ b/litellm-rust/crates/gateway/tests/server.rs
@@ -326,6 +326,7 @@ async fn readiness_answers_without_credentials_like_the_proxy_with_no_database(
     );
 }
 
+#[rstest]
 #[tokio::test]
 async fn forwards_speed_to_a_model_the_catalog_marks_fast() {
     let catalog = Catalog::parse(BUNDLED_REGISTRY).unwrap().value;
diff --git a/litellm-rust/crates/inference-messages/src/model_capabilities.rs b/litellm-rust/crates/inference-messages/src/model_capabilities.rs
index 0fe47335375..c4e87b2c6d6 100644
--- a/litellm-rust/crates/inference-messages/src/model_capabilities.rs
+++ b/litellm-rust/crates/inference-messages/src/model_capabilities.rs
@@ -42,7 +42,7 @@ pub fn anthropic_model_capabilities(
         });
     let probe = Probe {
         catalog,
-        model,
+        fallbacks: backstop_candidates(model),
         info: catalog.model_info(
             &candidate_names(name, provider)
                 .each_ref()
@@ -57,13 +57,17 @@ pub fn anthropic_model_capabilities(
         thinking_always_on: probe.supports("thinking_always_on"),
         supports_legacy_thinking: probe.supports("supports_legacy_thinking"),
         supports_output_config: probe.supports("supports_output_config"),
-        supports_sampling_params: backstop(catalog, name, "supports_sampling_params")
-            .unwrap_or_else(|| {
-                let lowered = name.to_lowercase();
-                !SAMPLING_RESTRICTED_NAMES
-                    .iter()
-                    .any(|restricted| lowered.contains(restricted))
-            }),
+        supports_sampling_params: backstop(
+            catalog,
+            &backstop_candidates(name),
+            "supports_sampling_params",
+        )
+        .unwrap_or_else(|| {
+            let lowered = name.to_lowercase();
+            !SAMPLING_RESTRICTED_NAMES
+                .iter()
+                .any(|restricted| lowered.contains(restricted))
+        }),
         supports_speed: provider == "anthropic"
             && flag(exact(catalog, name), "supports_speed") == Some(true),
         supports_mid_conversation_system: probe.supports("supports_mid_conversation_system"),
@@ -80,7 +84,7 @@ pub fn anthropic_model_capabilities(
 
 struct Probe<'a> {
     catalog: &'a Catalog,
-    model: &'a str,
+    fallbacks: Vec<String>,
     info: Option<Fields>,
     bare: Option<&'a Fields>,
 }
@@ -93,7 +97,7 @@ impl Probe<'_> {
         if self.info.is_some() && flag(self.bare, capability) == Some(true) {
             return true;
         }
-        backstop(self.catalog, self.model, capability) == Some(true)
+        backstop(self.catalog, &self.fallbacks, capability) == Some(true)
     }
 }
 
@@ -112,32 +116,52 @@ fn is_bedrock(provider: &str) -> bool {
     matches!(provider, "bedrock" | "bedrock_converse")
 }
 
-fn candidate_names(model: &str, provider: &str) -> [String; 5] {
-    let stripped = stripped_model(model, provider);
+fn candidate_names(model: &str, provider: &str) -> [String; 6] {
+    let split = split_model(model, provider);
+    let combined = format!("{provider}/{model}");
+    let (region_free_combined, combined_stripped) = if provider == "bedrock_mantle" {
+        (
+            format!("{provider}/{split}"),
+            format!("{provider}/{}", stripped_model(split, provider)),
+        )
+    } else {
+        (
+            combined.clone(),
+            format!("{provider}/{}", stripped_model(model, provider)),
+        )
+    };
     [
-        format!("{provider}/{model}"),
+        combined,
         model.to_owned(),
-        split_model(model, provider).to_owned(),
-        format!("{provider}/{stripped}"),
-        stripped,
+        region_free_combined,
+        split.to_owned(),
+        combined_stripped,
+        stripped_model(model, provider),
     ]
 }
 
 fn split_model<'a>(model: &'a str, provider: &str) -> &'a str {
+    if provider == "bedrock_mantle" {
+        return without_region(model);
+    }
     if !is_bedrock(provider) {
         return model;
     }
     let routed = without_routing_prefixes(model);
-    let region_free = match routed.split_once('/') {
-        Some((region, rest)) if is_bedrock_region(region) => rest,
-        _ => routed,
-    };
+    let region_free = without_region(routed);
     if !region_free.starts_with("arn:") {
         return routed;
     }
     region_free.rsplit('/').next().unwrap_or(region_free)
 }
 
+fn without_region(model: &str) -> &str {
+    match model.split_once('/') {
+        Some((region, rest)) if is_bedrock_region(region) => rest,
+        _ => model,
+    }
+}
+
 fn stripped_model(model: &str, provider: &str) -> String {
     match provider {
         provider if is_bedrock(provider) => bedrock_base_model(model).to_owned(),
@@ -146,8 +170,8 @@ fn stripped_model(model: &str, provider: &str) -> String {
     }
 }
 
-fn backstop(catalog: &Catalog, model: &str, capability: &str) -> Option<bool> {
-    backstop_candidates(model)
+fn backstop(catalog: &Catalog, candidates: &[String], capability: &str) -> Option<bool> {
+    candidates
         .iter()
         .find_map(|name| flag(exact(catalog, name), capability))
 }
@@ -203,13 +227,27 @@ mod tests {
             "supports_xhigh_reasoning_effort": true,
             "aliases": ["claude-test-5-latest"]
         },
-        "claude-slow-5": {"litellm_provider": "anthropic", "mode": "chat", "supports_reasoning": false},
+        "claude-slow-5": {
+            "litellm_provider": "anthropic",
+            "mode": "chat",
+            "supports_reasoning": false,
+            "supports_adaptive_thinking": false
+        },
+        "claude-embed-5": {"litellm_provider": "anthropic", "mode": "embedding"},
+        "anthropic/claude-split-5": {"litellm_provider": "anthropic", "mode": "chat"},
+        "claude-split-5": {"litellm_provider": "anthropic", "mode": "chat", "supports_reasoning": true},
         "anthropic.claude-test-5-v1:0": {
             "litellm_provider": "bedrock_converse",
             "mode": "chat",
             "supports_reasoning": true,
             "supports_speed": true
         },
+        "bedrock_mantle/anthropic.claude-mantle-5": {
+            "litellm_provider": "bedrock_mantle",
+            "mode": "chat",
+            "supports_reasoning": true,
+            "supports_adaptive_thinking": true
+        },
         "vertex_ai/claude-test-5": {
             "litellm_provider": "vertex_ai-anthropic_models",
             "mode": "chat",
@@ -218,7 +256,8 @@ mod tests {
         },
         "fallback_generalizations": {
             "rules": [
-                {"name": "routing", "pattern": "claude", "model_info": {"litellm_provider": "anthropic", "supports_speed": true}},
+                {"name": "routing", "pattern": "claude", "model_info": {"litellm_provider": "anthropic", "supports_reasoning": true}},
+                {"name": "derived", "pattern": "claude", "extends": "fill", "model_info": {"supports_reasoning": true}},
                 {"name": "new-family", "pattern": "claude-(?=newfamily)", "model_info": {"supports_reasoning": true}},
                 {
                     "name": "fill",
@@ -241,10 +280,15 @@ mod tests {
     #[case::bare_name("claude-test-5", None, (true, true, true, true))]
     #[case::configured_provider("claude-test-5", Some("anthropic"), (true, true, true, true))]
     #[case::other_casing("anthropic/Claude-Test-5", None, (true, true, false, true))]
-    #[case::filled_row("anthropic/claude-slow-5", None, (false, true, false, true))]
+    #[case::row_over_fill("anthropic/claude-slow-5", None, (false, false, false, true))]
+    #[case::fill_skips_other_modes("anthropic/claude-embed-5", None, (false, false, false, true))]
+    #[case::bare_row_under_prefixed_row("anthropic/claude-split-5", None, (true, true, false, true))]
+    #[case::other_provider_row("azure_ai/claude-test-5", None, (false, false, false, true))]
     #[case::unknown_family("anthropic/claude-newfamily-6", None, (true, true, false, true))]
+    #[case::unknown_model_skips_routing_and_extends_rules("anthropic/claude-other-7", None, (false, true, false, true))]
     #[case::cross_region_bedrock("bedrock/us.anthropic.claude-test-5-v1:0", None, (true, false, false, true))]
     #[case::region_path_bedrock("bedrock/us-east-1/anthropic.claude-test-5-v1:0", None, (true, false, false, true))]
+    #[case::region_path_mantle("bedrock_mantle/us-east-1/anthropic.claude-mantle-5", None, (true, true, false, true))]
     #[case::converse_bedrock("bedrock/converse/anthropic.claude-test-5-v1:0", None, (true, false, false, true))]
     #[case::vertex_version("vertex_ai/claude-test-5@20261001", None, (true, true, false, true))]
     #[case::sampling_restricted_name("anthropic/claude-fable-test", None, (false, true, false, false))]
diff --git a/litellm-rust/crates/router/tests/router.rs b/litellm-rust/crates/router/tests/router.rs
index 6e79e0dd9ef..1ab0727e25f 100644
--- a/litellm-rust/crates/router/tests/router.rs
+++ b/litellm-rust/crates/router/tests/router.rs
@@ -4,8 +4,9 @@ use litellm_config::Config;
 use litellm_inference_messages::{MessagesSettings, MessagesShaping};
 use litellm_model_catalog::Catalog;
 use litellm_router::{Deployment, Router};
-use rstest::rstest;
+use rstest::{fixture, rstest};
 
+#[fixture]
 fn catalog() -> Catalog {
     Catalog::parse(br#"{"provider-model": {"litellm_provider": "provider"}}"#)
         .unwrap()
@@ -18,12 +19,12 @@ fn catalog() -> Catalog {
     "api_key: test-key\n      api_base: https://provider.example/v1\n      custom_llm_provider: test-provider"
 )]
 #[case::secret_reference("api_key: os.environ/ROUTER_TEST_API_KEY")]
-fn configuration_preserves_deployment_parameters(#[case] parameters: &str) {
+fn configuration_preserves_deployment_parameters(catalog: Catalog, #[case] parameters: &str) {
     let config = Config::from_yaml(&format!(
         "model_list:\n  - model_name: public-model\n    litellm_params:\n      model: provider/model\n      {parameters}"
     ))
     .unwrap();
-    let router = Router::from_config(&config, &|_: &str| None, &catalog());
+    let router = Router::from_config(&config, &|_: &str| None, &catalog);
     let deployment = router.get(&config.model_list[0].model_name).unwrap();
     let params = &config.model_list[0].litellm_params;
 
@@ -40,7 +41,7 @@ fn configuration_preserves_deployment_parameters(#[case] parameters: &str) {
 }
 
 #[rstest]
-fn configuration_types_the_provider_params_of_a_deployment() {
+fn configuration_types_the_provider_params_of_a_deployment(catalog: Catalog) {
     let config = Config::from_yaml(
         "model_list:
   - model_name: public-model
@@ -51,7 +52,7 @@ fn configuration_types_the_provider_params_of_a_deployment() {
       azure_ad_token: ignored-by-every-group",
     )
     .unwrap();
-    let router = Router::from_config(&config, &|_: &str| None, &catalog());
+    let router = Router::from_config(&config, &|_: &str| None, &catalog);
     let params = &router.get("public-model").unwrap().litellm_params;
 
     assert_eq!(
@@ -70,7 +71,7 @@ fn configuration_types_the_provider_params_of_a_deployment() {
 #[case::unknown("missing", None)]
 #[case::provider_name_is_not_an_alias("provider/a", None)]
 #[case::case_sensitive("PUBLIC-A", None)]
-fn lookup_uses_public_names(#[case] name: &str, #[case] expected: Option<&str>) {
+fn lookup_uses_public_names(catalog: Catalog, #[case] name: &str, #[case] expected: Option<&str>) {
     let config = Config::from_yaml(
         "model_list:
   - model_name: public-a
@@ -81,17 +82,17 @@ fn lookup_uses_public_names(#[case] name: &str, #[case] expected: Option<&str>)
       model: provider/b",
     )
     .unwrap();
-    let router = Router::from_config(&config, &|_: &str| None, &catalog());
+    let router = Router::from_config(&config, &|_: &str| None, &catalog);
 
     assert_eq!(router.get(name).map(|entry| entry.model.as_str()), expected);
 }
 
 #[rstest]
-fn empty_configuration_has_no_deployment() {
+fn empty_configuration_has_no_deployment(catalog: Catalog) {
     let config = Config::from_yaml("model_list: []").unwrap();
 
     assert!(
-        Router::from_config(&config, &|_: &str| None, &catalog())
+        Router::from_config(&config, &|_: &str| None, &catalog)
             .get("")
             .is_none()
     );