diff --git a/internal/api/modules/amp/fallback_handlers.go b/internal/api/modules/amp/fallback_handlers.go
index 240cbbdf..940e9e3c 100644
--- a/internal/api/modules/amp/fallback_handlers.go
+++ b/internal/api/modules/amp/fallback_handlers.go
@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/gin-gonic/gin"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/routing/ctxkeys"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/thinking"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	log "github.com/sirupsen/logrus"
@@ -32,11 +33,13 @@ const (
 )
 
 // MappedModelContextKey is the Gin context key for passing mapped model names.
-const MappedModelContextKey = "mapped_model"
+// Deprecated: Use ctxkeys.MappedModel instead.
+const MappedModelContextKey = string(ctxkeys.MappedModel)
 
 // FallbackModelsContextKey is the Gin context key for passing fallback model names.
 // When the primary mapped model fails (e.g., quota exceeded), these models can be tried.
-const FallbackModelsContextKey = "fallback_models"
+// Deprecated: Use ctxkeys.FallbackModels instead.
+const FallbackModelsContextKey = string(ctxkeys.FallbackModels)
 
 // logAmpRouting logs the routing decision for an Amp request with structured fields
 func logAmpRouting(routeType AmpRouteType, requestedModel, resolvedModel, provider, path string) {
@@ -227,10 +230,10 @@ func (fh *FallbackHandler) WrapHandler(handler gin.HandlerFunc) gin.HandlerFunc
 				bodyBytes = rewriteModelInRequest(bodyBytes, mappedModels[0])
 				c.Request.Body = io.NopCloser(bytes.NewReader(bodyBytes))
 				// Store mapped model and fallbacks in context for handlers
-				c.Set(MappedModelContextKey, mappedModels[0])
-				if len(mappedModels) > 1 {
-					c.Set(FallbackModelsContextKey, mappedModels[1:])
-				}
+							c.Set(string(ctxkeys.MappedModel), mappedModels[0])
+							if len(mappedModels) > 1 {
+								c.Set(string(ctxkeys.FallbackModels), mappedModels[1:])
+							}
 				resolvedModel = mappedModels[0]
 				usedMapping = true
 				providers = mappedProviders
@@ -251,9 +254,9 @@ func (fh *FallbackHandler) WrapHandler(handler gin.HandlerFunc) gin.HandlerFunc
 					bodyBytes = rewriteModelInRequest(bodyBytes, mappedModels[0])
 					c.Request.Body = io.NopCloser(bytes.NewReader(bodyBytes))
 					// Store mapped model and fallbacks in context for handlers
-					c.Set(MappedModelContextKey, mappedModels[0])
+					c.Set(string(ctxkeys.MappedModel), mappedModels[0])
 					if len(mappedModels) > 1 {
-						c.Set(FallbackModelsContextKey, mappedModels[1:])
+						c.Set(string(ctxkeys.FallbackModels), mappedModels[1:])
 					}
 					resolvedModel = mappedModels[0]
 					usedMapping = true
diff --git a/sdk/cliproxy/auth/conductor.go b/sdk/cliproxy/auth/conductor.go
index 9fa05827..26c538d7 100644
--- a/sdk/cliproxy/auth/conductor.go
+++ b/sdk/cliproxy/auth/conductor.go
@@ -18,6 +18,7 @@ import (
 	internalconfig "github.com/router-for-me/CLIProxyAPI/v6/internal/config"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/logging"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/routing/ctxkeys"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/thinking"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/executor"
@@ -577,7 +578,7 @@ func (m *Manager) executeWithFallback(
 
 	// Track fallback models from context (provided by Amp module fallback_models key)
 	var fallbacks []string
-	if v := ctx.Value("fallback_models"); v != nil {
+	if v := ctx.Value(ctxkeys.FallbackModels); v != nil {
 		if fs, ok := v.([]string); ok {
 			fallbacks = fs
 		}