diff --git a/src/lib.rs b/src/lib.rs
index 690c48f..2a04392 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -166,28 +166,29 @@ pub mod api {
 
     impl std::fmt::Display for Choice {
         fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-            write!(f, "{}", self.text)
+            self.text.fmt(f)
         }
     }
 
     /// Represents a logprobs subdocument
     #[derive(Deserialize, Debug)]
     pub struct LogProbs {
-        tokens: Vec<String>,
-        token_logprobs: Vec<Option<f64>>,
-        top_logprobs: Vec<Option<HashMap<String, f64>>>,
-        text_offset: Vec<u64>,
+        pub tokens: Vec<String>,
+        pub token_logprobs: Vec<Option<f64>>,
+        pub top_logprobs: Vec<Option<HashMap<String, f64>>>,
+        pub text_offset: Vec<u64>,
     }
 
     /// Reason a prompt completion finished.
-    #[derive(Deserialize, Debug)]
-    #[serde(rename_all = "kebab-case")]
+    #[derive(Deserialize, Debug, Eq, PartialEq)]
     #[non_exhaustive]
     pub enum FinishReason {
         /// The maximum length was reached
-        Length,
+        #[serde(rename = "max_tokens")]
+        MaxTokensReached,
         /// The stop token was encountered
-        Stop,
+        #[serde(rename = "stop")]
+        StopSequenceReached,
     }
 
     /// Error response object from the server
@@ -414,7 +415,7 @@ mod unit {
         use api::{Engine, EngineInfo};
         let _m = mockito::mock("GET", "/engines")
             .with_status(200)
-            .with_header("content-type", "text/json")
+            .with_header("content-type", "application/json")
             .with_body(
                 r#"{
             "object": "list",
@@ -500,7 +501,7 @@ mod unit {
     async fn engine_error_response() -> crate::Result<()> {
         let _m = mockito::mock("GET", "/engines/davinci")
             .with_status(404)
-            .with_header("content-type", "text/json")
+            .with_header("content-type", "application/json")
             .with_body(
                 r#"{
                     "error": {
@@ -521,6 +522,61 @@ mod unit {
         }
         Ok(())
     }
+
+    #[tokio::test]
+    async fn completion_args() -> crate::Result<()> {
+        let _m = mockito::mock("POST", "/engines/davinci/completions")
+            .with_status(200)
+            .with_header("content-type", "application/json")
+            .with_body(
+                r#"{
+                "id": "cmpl-uqkvlQyYK7bGYrRHQ0eXlWi7",
+                "object": "text_completion",
+                "created": 1589478378,
+                "model": "davinci:2020-05-03",
+                "choices": [
+                    {
+                    "text": " there was a girl who",
+                    "index": 0,
+                    "logprobs": null,
+                    "finish_reason": "max_tokens"
+                    }
+                ]
+                }"#,
+            )
+            .create();
+        let expected = api::Completion {
+            id: "cmpl-uqkvlQyYK7bGYrRHQ0eXlWi7".into(),
+            created: 1589478378,
+            model: "davinci:2020-05-03".into(),
+            choices: vec![api::Choice {
+                text: " there was a girl who".into(),
+                index: 0,
+                logprobs: None,
+                finish_reason: api::FinishReason::MaxTokensReached,
+            }],
+        };
+        let args = api::CompletionArgs::builder()
+            .engine(api::Engine::Davinci)
+            .prompt("Once upon a time")
+            .max_tokens(5)
+            .temperature(1.0)
+            .top_p(1.0)
+            .n(1)
+            .stop(vec!["\n".into()])
+            .build()?;
+        let response = mocked_client().complete(args).await?;
+        assert_eq!(response.model, expected.model);
+        assert_eq!(response.id, expected.id);
+        assert_eq!(response.created, expected.created);
+        let (resp_choice, expected_choice) = (&response.choices[0], &expected.choices[0]);
+        assert_eq!(resp_choice.text, expected_choice.text);
+        assert_eq!(resp_choice.index, expected_choice.index);
+        assert!(resp_choice.logprobs.is_none());
+        assert_eq!(resp_choice.finish_reason, expected_choice.finish_reason);
+
+        Ok(())
+    }
 }
 #[cfg(test)]
 mod integration {
@@ -590,4 +646,24 @@ mod integration {
         client.complete(args).await?;
         Ok(())
     }
+
+    #[tokio::test]
+    async fn complete_stop_condition() -> crate::Result<()> {
+        let client = get_client();
+        let mut args = api::CompletionArgs::builder();
+        let completion = args
+            .prompt(
+                r#"
+Q: Please type `#` now
+A:"#,
+            )
+            // turn temp & top_p way down to prevent test flakiness
+            .temperature(0.0)
+            .top_p(0.0)
+            .max_tokens(100)
+            .stop(vec!["#".into(), "\n".into()])
+            .complete(&client).await?;
+        assert_eq!(completion.choices[0].finish_reason, api::FinishReason::StopSequenceReached);
+        Ok(())
+    }
 }