diff --git a/extraction/claude.go b/extraction/claude.go
index ed3fe98..694521c 100644
--- a/extraction/claude.go
+++ b/extraction/claude.go
@@ -35,7 +35,7 @@ type claudeResponse struct {
 
 func callClaude(ctx context.Context, apiKey, prompt string) (string, error) {
 	reqBody := claudeRequest{
-		Model:     "claude-sonnet-4-20250514",
+		Model:     "claude-sonnet-4-6",
 		MaxTokens: 2048,
 		Messages: []claudeMessage{
 			{Role: "user", Content: prompt},
diff --git a/server/nudge.go b/server/nudge.go
index eaf8489..6191be2 100644
--- a/server/nudge.go
+++ b/server/nudge.go
@@ -25,7 +25,7 @@ The message should be polite, casual, and natural — like something a real pers
 Return ONLY the message text, nothing else.`, c.PersonName, c.Title, c.Context, c.SourceQuote, c.SourceTime)
 
 	reqBody := map[string]any{
-		"model":      "claude-sonnet-4-20250514",
+		"model":      "claude-sonnet-4-6",
 		"max_tokens": 256,
 		"messages": []map[string]string{
 			{"role": "user", "content": prompt},
diff --git a/server/server.go b/server/server.go
index 3f522a9..6933529 100644
--- a/server/server.go
+++ b/server/server.go
@@ -344,7 +344,7 @@ func (s *Server) handleValidateKey(w http.ResponseWriter, r *http.Request) {
 	}
 
 	req, _ := http.NewRequestWithContext(r.Context(), "POST", "https://api.anthropic.com/v1/messages",
-		bytes.NewReader([]byte(`{"model":"claude-sonnet-4-20250514","max_tokens":1,"messages":[{"role":"user","content":"hi"}]}`)))
+		bytes.NewReader([]byte(`{"model":"claude-sonnet-4-6","max_tokens":1,"messages":[{"role":"user","content":"hi"}]}`)))
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("x-api-key", body.APIKey)
 	req.Header.Set("anthropic-version", "2023-06-01")