diff --git a/codex-rs/core/src/client_common.rs b/codex-rs/core/src/client_common.rs
index c3489200..67fcb7cd 100644
--- a/codex-rs/core/src/client_common.rs
+++ b/codex-rs/core/src/client_common.rs
@@ -94,6 +94,7 @@ pub(crate) struct Reasoning {
 #[derive(Debug, Serialize, Default, Clone, Copy)]
 #[serde(rename_all = "lowercase")]
 pub(crate) enum OpenAiReasoningEffort {
+    Minimal,
     Low,
     #[default]
     Medium,
@@ -103,6 +104,7 @@ pub(crate) enum OpenAiReasoningEffort {
 impl From<ReasoningEffortConfig> for Option<OpenAiReasoningEffort> {
     fn from(effort: ReasoningEffortConfig) -> Self {
         match effort {
+            ReasoningEffortConfig::Minimal => Some(OpenAiReasoningEffort::Minimal),
             ReasoningEffortConfig::Low => Some(OpenAiReasoningEffort::Low),
             ReasoningEffortConfig::Medium => Some(OpenAiReasoningEffort::Medium),
             ReasoningEffortConfig::High => Some(OpenAiReasoningEffort::High),
diff --git a/codex-rs/core/src/config_types.rs b/codex-rs/core/src/config_types.rs
index bb61f820..17fd6104 100644
--- a/codex-rs/core/src/config_types.rs
+++ b/codex-rs/core/src/config_types.rs
@@ -206,6 +206,7 @@ impl From<ShellEnvironmentPolicyToml> for ShellEnvironmentPolicy {
 #[serde(rename_all = "lowercase")]
 #[strum(serialize_all = "lowercase")]
 pub enum ReasoningEffort {
+    Minimal,
     Low,
     #[default]
     Medium,