diff --git a/src/lib/ChatCompletionStream.ts b/src/lib/ChatCompletionStream.ts
index 5036d4f60..7d88b27cb 100644
--- a/src/lib/ChatCompletionStream.ts
+++ b/src/lib/ChatCompletionStream.ts
@@ -743,7 +743,7 @@ export interface ChatCompletionSnapshot {
    * Can be used in conjunction with the `seed` request parameter to understand when
    * backend changes have been made that might impact determinism.
    */
-  system_fingerprint?: string;
+  system_fingerprint?: string | null;
 }
 
 export namespace ChatCompletionSnapshot {
diff --git a/src/resources/chat/completions/completions.ts b/src/resources/chat/completions/completions.ts
index 82bb2e27c..e8480dd4c 100644
--- a/src/resources/chat/completions/completions.ts
+++ b/src/resources/chat/completions/completions.ts
@@ -280,9 +280,9 @@ export interface ChatCompletion {
    *   utilize scale tier credits until they are exhausted.
    * - If set to 'auto', and the Project is not Scale tier enabled, the request will
    *   be processed using the default service tier with a lower uptime SLA and no
-   *   latency guarentee.
+   *   latency guarantee.
    * - If set to 'default', the request will be processed using the default service
-   *   tier with a lower uptime SLA and no latency guarentee.
+   *   tier with a lower uptime SLA and no latency guarantee.
    * - If set to 'flex', the request will be processed with the Flex Processing
    *   service tier.
    *   [Learn more](https://platform.openai.com/docs/guides/flex-processing).
@@ -299,7 +299,7 @@ export interface ChatCompletion {
    * Can be used in conjunction with the `seed` request parameter to understand when
    * backend changes have been made that might impact determinism.
    */
-  system_fingerprint?: string;
+  system_fingerprint?: string | null;
 
   /**
    * Usage statistics for the completion request.
@@ -531,9 +531,9 @@ export interface ChatCompletionChunk {
    *   utilize scale tier credits until they are exhausted.
    * - If set to 'auto', and the Project is not Scale tier enabled, the request will
    *   be processed using the default service tier with a lower uptime SLA and no
-   *   latency guarentee.
+   *   latency guarantee.
    * - If set to 'default', the request will be processed using the default service
-   *   tier with a lower uptime SLA and no latency guarentee.
+   *   tier with a lower uptime SLA and no latency guarantee.
    * - If set to 'flex', the request will be processed with the Flex Processing
    *   service tier.
    *   [Learn more](https://platform.openai.com/docs/guides/flex-processing).
@@ -549,7 +549,7 @@ export interface ChatCompletionChunk {
    * Can be used in conjunction with the `seed` request parameter to understand when
    * backend changes have been made that might impact determinism.
    */
-  system_fingerprint?: string;
+  system_fingerprint?: string | null;
 
   /**
    * An optional field that will only be present when you set
@@ -1453,9 +1453,9 @@ export interface ChatCompletionCreateParamsBase {
    *   utilize scale tier credits until they are exhausted.
    * - If set to 'auto', and the Project is not Scale tier enabled, the request will
    *   be processed using the default service tier with a lower uptime SLA and no
-   *   latency guarentee.
+   *   latency guarantee.
    * - If set to 'default', the request will be processed using the default service
-   *   tier with a lower uptime SLA and no latency guarentee.
+   *   tier with a lower uptime SLA and no latency guarantee.
    * - If set to 'flex', the request will be processed with the Flex Processing
    *   service tier.
    *   [Learn more](https://platform.openai.com/docs/guides/flex-processing).
diff --git a/src/resources/completions.ts b/src/resources/completions.ts
index 042e51693..8a0862ad0 100644
--- a/src/resources/completions.ts
+++ b/src/resources/completions.ts
@@ -71,7 +71,8 @@ export interface Completion {
    * Can be used in conjunction with the `seed` request parameter to understand when
    * backend changes have been made that might impact determinism.
    */
-  system_fingerprint?: string;
+
+  system_fingerprint?: string | null;
 
   /**
    * Usage statistics for the completion request.
diff --git a/src/resources/responses/responses.ts b/src/resources/responses/responses.ts
index e5400dcea..bde199252 100644
--- a/src/resources/responses/responses.ts
+++ b/src/resources/responses/responses.ts
@@ -488,9 +488,9 @@ export interface Response {
    *   utilize scale tier credits until they are exhausted.
    * - If set to 'auto', and the Project is not Scale tier enabled, the request will
    *   be processed using the default service tier with a lower uptime SLA and no
-   *   latency guarentee.
+   *   latency guarantee.
    * - If set to 'default', the request will be processed using the default service
-   *   tier with a lower uptime SLA and no latency guarentee.
+   *   tier with a lower uptime SLA and no latency guarantee.
    * - If set to 'flex', the request will be processed with the Flex Processing
    *   service tier.
    *   [Learn more](https://platform.openai.com/docs/guides/flex-processing).
@@ -4631,9 +4631,9 @@ export interface ResponseCreateParamsBase {
    *   utilize scale tier credits until they are exhausted.
    * - If set to 'auto', and the Project is not Scale tier enabled, the request will
    *   be processed using the default service tier with a lower uptime SLA and no
-   *   latency guarentee.
+   *   latency guarantee.
    * - If set to 'default', the request will be processed using the default service
-   *   tier with a lower uptime SLA and no latency guarentee.
+   *   tier with a lower uptime SLA and no latency guarantee.
    * - If set to 'flex', the request will be processed with the Flex Processing
    *   service tier.
    *   [Learn more](https://platform.openai.com/docs/guides/flex-processing).