diff --git a/codex-rs/core/src/features.rs b/codex-rs/core/src/features.rs
index dbc4e7068..8aa5e181d 100644
--- a/codex-rs/core/src/features.rs
+++ b/codex-rs/core/src/features.rs
@@ -708,8 +708,8 @@ pub const FEATURES: &[FeatureSpec] = &[
     FeatureSpec {
         id: Feature::FastMode,
         key: "fast_mode",
-        stage: Stage::UnderDevelopment,
-        default_enabled: false,
+        stage: Stage::Stable,
+        default_enabled: true,
     },
     FeatureSpec {
         id: Feature::VoiceTranscription,