diff --git a/router/src/server.rs b/router/src/server.rs
index 2f87eaeb..6710baf6 100644
--- a/router/src/server.rs
+++ b/router/src/server.rs
@@ -1009,9 +1009,9 @@ async fn chat_completions(
     let logprobs = logprobs.unwrap_or(false);
     let tool_prompt = tool_prompt.unwrap_or_default();
     let stop = stop.unwrap_or_default();
-    // rescale temperature starting from 0.0 to 1.0
+    // chat temperature is zero-indexed instead of one-indexed; so we add 1.0 to the input or default to 1.0
     let adjusted_temperature = temperature.map_or(1.0, |t| t + 1.0);
-    let do_sample = adjusted_temperature != 0.0;
+    let do_sample = adjusted_temperature != 1.0;
     let temperature = Some(adjusted_temperature);
 
     // extract tool grammar if present
diff --git a/router/src/validation.rs b/router/src/validation.rs
index 926625c2..2029c7e0 100644
--- a/router/src/validation.rs
+++ b/router/src/validation.rs
@@ -217,7 +217,7 @@ impl Validation {
         }
 
         let temperature = temperature.unwrap_or(1.0);
-        if temperature < 0.0 {
+        if temperature <= 0.0 {
             return Err(ValidationError::Temperature);
         }