diff --git a/src/adapter/adapters/anthropic/adapter_impl.rs b/src/adapter/adapters/anthropic/adapter_impl.rs
index 789b3b77..30da5ad1 100644
--- a/src/adapter/adapters/anthropic/adapter_impl.rs
+++ b/src/adapter/adapters/anthropic/adapter_impl.rs
@@ -97,19 +97,25 @@ impl Adapter for AnthropicAdapter {
 	) -> Result<WebRequestData> {
 		let ServiceTarget { endpoint, auth, model } = target;
 
-		// -- api_key
-		let api_key = get_api_key(auth, &model)?;
-
 		// -- url
 		let url = Self::get_service_url(&model, service_type, endpoint)?;
 
-		// -- headers
-		let headers = Headers::from(vec![
-			// headers
-			("x-api-key".to_string(), api_key),
-			("anthropic-beta".to_string(), "effort-2025-11-24".to_string()),
-			("anthropic-version".to_string(), ANTHROPIC_VERSION.to_string()),
-		]);
+		// -- headers (Bearer token uses Authorization header, otherwise x-api-key)
+		let headers = match &auth {
+			AuthData::BearerToken(token) => Headers::from(vec![
+				("Authorization".to_string(), format!("Bearer {}", token)),
+				("anthropic-beta".to_string(), "effort-2025-11-24".to_string()),
+				("anthropic-version".to_string(), ANTHROPIC_VERSION.to_string()),
+			]),
+			_ => {
+				let api_key = get_api_key(auth, &model)?;
+				Headers::from(vec![
+					("x-api-key".to_string(), api_key),
+					("anthropic-beta".to_string(), "effort-2025-11-24".to_string()),
+					("anthropic-version".to_string(), ANTHROPIC_VERSION.to_string()),
+				])
+			}
+		};
 
 		// -- Parts
 		let AnthropicRequestParts {
diff --git a/src/resolver/auth_data.rs b/src/resolver/auth_data.rs
index 74027adc..b8a95191 100644
--- a/src/resolver/auth_data.rs
+++ b/src/resolver/auth_data.rs
@@ -10,6 +10,9 @@ pub enum AuthData {
 	/// The key value itself.
 	Key(String),
 
+	/// OAuth Bearer token for providers that support `Authorization: Bearer` auth.
+	BearerToken(String),
+
 	/// Override headers and request url for unorthodox authentication schemes
 	RequestOverride { url: String, headers: Headers },
 
@@ -44,6 +47,8 @@ impl AuthData {
 		match self {
 			// Overrides don't use an api key
 			AuthData::RequestOverride { .. } => Ok(String::new()),
+			// Bearer tokens return the token value
+			AuthData::BearerToken(value) => Ok(value.to_string()),
 			AuthData::FromEnv(env_name) => {
 				// Get value from the environment name.
 				let value = std::env::var(env_name).map_err(|_| Error::ApiKeyEnvNotFound {
@@ -66,6 +71,7 @@ impl std::fmt::Debug for AuthData {
 			// NOTE: Here we also redact for `FromEnv` in case the developer confuses this with a key.
 			AuthData::FromEnv(_env_name) => write!(f, "AuthData::FromEnv(REDACTED)"),
 			AuthData::Key(_) => write!(f, "AuthData::Single(REDACTED)"),
+			AuthData::BearerToken(_) => write!(f, "AuthData::BearerToken(REDACTED)"),
 			AuthData::MultiKeys(_) => write!(f, "AuthData::Multi(REDACTED)"),
 			AuthData::RequestOverride { .. } => {
 				write!(f, "AuthData::RequestOverride {{ url: REDACTED, headers: REDACTED }}")
@@ -75,3 +81,44 @@ impl std::fmt::Debug for AuthData {
 }
 
 // endregion: --- AuthData Std Impls
+
+// region:    --- Tests
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn test_bearer_token_single_key_value() {
+		let auth = AuthData::BearerToken("sk-ant-oat01-test-token".to_string());
+		let value = auth.single_key_value().unwrap();
+		assert_eq!(value, "sk-ant-oat01-test-token");
+	}
+
+	#[test]
+	fn test_bearer_token_debug_redacted() {
+		let auth = AuthData::BearerToken("secret-token".to_string());
+		let debug = format!("{:?}", auth);
+		assert_eq!(debug, "AuthData::BearerToken(REDACTED)");
+		assert!(!debug.contains("secret-token"));
+	}
+
+	#[test]
+	fn test_key_single_key_value() {
+		let auth = AuthData::Key("test-api-key".to_string());
+		let value = auth.single_key_value().unwrap();
+		assert_eq!(value, "test-api-key");
+	}
+
+	#[test]
+	fn test_request_override_returns_empty() {
+		let auth = AuthData::RequestOverride {
+			url: "https://example.com".to_string(),
+			headers: Headers::default(),
+		};
+		let value = auth.single_key_value().unwrap();
+		assert_eq!(value, "");
+	}
+}
+
+// endregion: --- Tests