diff --git a/.stats.yml b/.stats.yml
index 903c15996..de3167f3a 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 68
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-85a85e0c08de456441431c0ae4e9c078cc8f9748c29430b9a9058340db6389ee.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-501122aa32adaa2abb3d4487880ab9cdf2141addce2e6c3d1bd9bb6b44c318a8.yml
diff --git a/src/resources/beta/assistants.ts b/src/resources/beta/assistants.ts
index 0dbb076d5..410d520b0 100644
--- a/src/resources/beta/assistants.ts
+++ b/src/resources/beta/assistants.ts
@@ -151,11 +151,11 @@ export interface Assistant {
    * and all GPT-3.5 Turbo models since `gpt-3.5-turbo-1106`.
    *
    * Setting to `{ "type": "json_schema", "json_schema": {...} }` enables Structured
-   * Outputs which guarantees the model will match your supplied JSON schema. Learn
-   * more in the
+   * Outputs which ensures the model will match your supplied JSON schema. Learn more
+   * in the
    * [Structured Outputs guide](https://platform.openai.com/docs/guides/structured-outputs).
    *
-   * Setting to `{ "type": "json_object" }` enables JSON mode, which guarantees the
+   * Setting to `{ "type": "json_object" }` enables JSON mode, which ensures the
    * message the model generates is valid JSON.
    *
    * **Important:** when using JSON mode, you **must** also instruct the model to
@@ -665,7 +665,8 @@ export namespace FileSearchTool {
     max_num_results?: number;
 
     /**
-     * The ranking options for the file search.
+     * The ranking options for the file search. If not specified, the file search tool
+     * will use the `auto` ranker and a score_threshold of 0.
      *
      * See the
      * [file search tool documentation](https://platform.openai.com/docs/assistants/tools/file-search/customizing-file-search-settings)
@@ -676,7 +677,8 @@ export namespace FileSearchTool {
 
   export namespace FileSearch {
     /**
-     * The ranking options for the file search.
+     * The ranking options for the file search. If not specified, the file search tool
+     * will use the `auto` ranker and a score_threshold of 0.
      *
      * See the
      * [file search tool documentation](https://platform.openai.com/docs/assistants/tools/file-search/customizing-file-search-settings)
@@ -684,16 +686,16 @@ export namespace FileSearchTool {
      */
     export interface RankingOptions {
       /**
-       * The ranker to use for the file search. If not specified will use the `auto`
-       * ranker.
+       * The score threshold for the file search. All values must be a floating point
+       * number between 0 and 1.
        */
-      ranker?: 'auto' | 'default_2024_08_21';
+      score_threshold: number;
 
       /**
-       * The score threshold for the file search. All values must be a floating point
-       * number between 0 and 1.
+       * The ranker to use for the file search. If not specified will use the `auto`
+       * ranker.
        */
-      score_threshold?: number;
+      ranker?: 'auto' | 'default_2024_08_21';
     }
   }
 }
@@ -1125,11 +1127,11 @@ export interface AssistantCreateParams {
    * and all GPT-3.5 Turbo models since `gpt-3.5-turbo-1106`.
    *
    * Setting to `{ "type": "json_schema", "json_schema": {...} }` enables Structured
-   * Outputs which guarantees the model will match your supplied JSON schema. Learn
-   * more in the
+   * Outputs which ensures the model will match your supplied JSON schema. Learn more
+   * in the
    * [Structured Outputs guide](https://platform.openai.com/docs/guides/structured-outputs).
    *
-   * Setting to `{ "type": "json_object" }` enables JSON mode, which guarantees the
+   * Setting to `{ "type": "json_object" }` enables JSON mode, which ensures the
    * message the model generates is valid JSON.
    *
    * **Important:** when using JSON mode, you **must** also instruct the model to
@@ -1283,11 +1285,11 @@ export interface AssistantUpdateParams {
    * and all GPT-3.5 Turbo models since `gpt-3.5-turbo-1106`.
    *
    * Setting to `{ "type": "json_schema", "json_schema": {...} }` enables Structured
-   * Outputs which guarantees the model will match your supplied JSON schema. Learn
-   * more in the
+   * Outputs which ensures the model will match your supplied JSON schema. Learn more
+   * in the
    * [Structured Outputs guide](https://platform.openai.com/docs/guides/structured-outputs).
    *
-   * Setting to `{ "type": "json_object" }` enables JSON mode, which guarantees the
+   * Setting to `{ "type": "json_object" }` enables JSON mode, which ensures the
    * message the model generates is valid JSON.
    *
    * **Important:** when using JSON mode, you **must** also instruct the model to
diff --git a/src/resources/beta/threads/runs/runs.ts b/src/resources/beta/threads/runs/runs.ts
index fe3a278e9..b48edd5b1 100644
--- a/src/resources/beta/threads/runs/runs.ts
+++ b/src/resources/beta/threads/runs/runs.ts
@@ -429,11 +429,11 @@ export interface Run {
    * and all GPT-3.5 Turbo models since `gpt-3.5-turbo-1106`.
    *
    * Setting to `{ "type": "json_schema", "json_schema": {...} }` enables Structured
-   * Outputs which guarantees the model will match your supplied JSON schema. Learn
-   * more in the
+   * Outputs which ensures the model will match your supplied JSON schema. Learn more
+   * in the
    * [Structured Outputs guide](https://platform.openai.com/docs/guides/structured-outputs).
    *
-   * Setting to `{ "type": "json_object" }` enables JSON mode, which guarantees the
+   * Setting to `{ "type": "json_object" }` enables JSON mode, which ensures the
    * message the model generates is valid JSON.
    *
    * **Important:** when using JSON mode, you **must** also instruct the model to
@@ -709,11 +709,11 @@ export interface RunCreateParamsBase {
    * and all GPT-3.5 Turbo models since `gpt-3.5-turbo-1106`.
    *
    * Setting to `{ "type": "json_schema", "json_schema": {...} }` enables Structured
-   * Outputs which guarantees the model will match your supplied JSON schema. Learn
-   * more in the
+   * Outputs which ensures the model will match your supplied JSON schema. Learn more
+   * in the
    * [Structured Outputs guide](https://platform.openai.com/docs/guides/structured-outputs).
    *
-   * Setting to `{ "type": "json_object" }` enables JSON mode, which guarantees the
+   * Setting to `{ "type": "json_object" }` enables JSON mode, which ensures the
    * message the model generates is valid JSON.
    *
    * **Important:** when using JSON mode, you **must** also instruct the model to
diff --git a/src/resources/beta/threads/threads.ts b/src/resources/beta/threads/threads.ts
index c49618f0c..be959eb30 100644
--- a/src/resources/beta/threads/threads.ts
+++ b/src/resources/beta/threads/threads.ts
@@ -126,11 +126,11 @@ export class Threads extends APIResource {
  * and all GPT-3.5 Turbo models since `gpt-3.5-turbo-1106`.
  *
  * Setting to `{ "type": "json_schema", "json_schema": {...} }` enables Structured
- * Outputs which guarantees the model will match your supplied JSON schema. Learn
- * more in the
+ * Outputs which ensures the model will match your supplied JSON schema. Learn more
+ * in the
  * [Structured Outputs guide](https://platform.openai.com/docs/guides/structured-outputs).
  *
- * Setting to `{ "type": "json_object" }` enables JSON mode, which guarantees the
+ * Setting to `{ "type": "json_object" }` enables JSON mode, which ensures the
  * message the model generates is valid JSON.
  *
  * **Important:** when using JSON mode, you **must** also instruct the model to
@@ -522,11 +522,11 @@ export interface ThreadCreateAndRunParamsBase {
    * and all GPT-3.5 Turbo models since `gpt-3.5-turbo-1106`.
    *
    * Setting to `{ "type": "json_schema", "json_schema": {...} }` enables Structured
-   * Outputs which guarantees the model will match your supplied JSON schema. Learn
-   * more in the
+   * Outputs which ensures the model will match your supplied JSON schema. Learn more
+   * in the
    * [Structured Outputs guide](https://platform.openai.com/docs/guides/structured-outputs).
    *
-   * Setting to `{ "type": "json_object" }` enables JSON mode, which guarantees the
+   * Setting to `{ "type": "json_object" }` enables JSON mode, which ensures the
    * message the model generates is valid JSON.
    *
    * **Important:** when using JSON mode, you **must** also instruct the model to
diff --git a/src/resources/chat/chat.ts b/src/resources/chat/chat.ts
index 684b1307a..1a758fbb5 100644
--- a/src/resources/chat/chat.ts
+++ b/src/resources/chat/chat.ts
@@ -9,9 +9,14 @@ export class Chat extends APIResource {
 }
 
 export type ChatModel =
+  | 'o1-preview'
+  | 'o1-preview-2024-09-12'
+  | 'o1-mini'
+  | 'o1-mini-2024-09-12'
   | 'gpt-4o'
-  | 'gpt-4o-2024-05-13'
   | 'gpt-4o-2024-08-06'
+  | 'gpt-4o-2024-05-13'
+  | 'chatgpt-4o-latest'
   | 'gpt-4o-mini'
   | 'gpt-4o-mini-2024-07-18'
   | 'gpt-4-turbo'
diff --git a/src/resources/chat/completions.ts b/src/resources/chat/completions.ts
index 764bdb129..f426ce36f 100644
--- a/src/resources/chat/completions.ts
+++ b/src/resources/chat/completions.ts
@@ -788,14 +788,21 @@ export interface ChatCompletionCreateParamsBase {
    */
   logprobs?: boolean | null;
 
+  /**
+   * An upper bound for the number of tokens that can be generated for a completion,
+   * including visible output tokens and
+   * [reasoning tokens](https://platform.openai.com/docs/guides/reasoning).
+   */
+  max_completion_tokens?: number | null;
+
   /**
    * The maximum number of [tokens](/tokenizer) that can be generated in the chat
-   * completion.
+   * completion. This value can be used to control
+   * [costs](https://openai.com/api/pricing/) for text generated via API.
    *
-   * The total length of input tokens and generated tokens is limited by the model's
-   * context length.
-   * [Example Python code](https://cookbook.openai.com/examples/how_to_count_tokens_with_tiktoken)
-   * for counting tokens.
+   * This value is now deprecated in favor of `max_completion_tokens`, and is not
+   * compatible with
+   * [o1 series models](https://platform.openai.com/docs/guides/reasoning).
    */
   max_tokens?: number | null;
 
@@ -830,11 +837,11 @@ export interface ChatCompletionCreateParamsBase {
    * all GPT-3.5 Turbo models newer than `gpt-3.5-turbo-1106`.
    *
    * Setting to `{ "type": "json_schema", "json_schema": {...} }` enables Structured
-   * Outputs which guarantees the model will match your supplied JSON schema. Learn
-   * more in the
+   * Outputs which ensures the model will match your supplied JSON schema. Learn more
+   * in the
    * [Structured Outputs guide](https://platform.openai.com/docs/guides/structured-outputs).
    *
-   * Setting to `{ "type": "json_object" }` enables JSON mode, which guarantees the
+   * Setting to `{ "type": "json_object" }` enables JSON mode, which ensures the
    * message the model generates is valid JSON.
    *
    * **Important:** when using JSON mode, you **must** also instruct the model to
@@ -863,8 +870,11 @@ export interface ChatCompletionCreateParamsBase {
    * Specifies the latency tier to use for processing the request. This parameter is
    * relevant for customers subscribed to the scale tier service:
    *
-   * - If set to 'auto', the system will utilize scale tier credits until they are
-   *   exhausted.
+   * - If set to 'auto', and the Project is Scale tier enabled, the system will
+   *   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.
    * - If set to 'default', the request will be processed using the default service
    *   tier with a lower uptime SLA and no latency guarentee.
    * - When not set, the default behavior is 'auto'.
diff --git a/src/resources/completions.ts b/src/resources/completions.ts
index a6b527995..152496766 100644
--- a/src/resources/completions.ts
+++ b/src/resources/completions.ts
@@ -120,6 +120,23 @@ export interface CompletionUsage {
    * Total number of tokens used in the request (prompt + completion).
    */
   total_tokens: number;
+
+  /**
+   * Breakdown of tokens used in a completion.
+   */
+  completion_tokens_details?: CompletionUsage.CompletionTokensDetails;
+}
+
+export namespace CompletionUsage {
+  /**
+   * Breakdown of tokens used in a completion.
+   */
+  export interface CompletionTokensDetails {
+    /**
+     * Tokens generated by the model for reasoning.
+     */
+    reasoning_tokens?: number;
+  }
 }
 
 export type CompletionCreateParams = CompletionCreateParamsNonStreaming | CompletionCreateParamsStreaming;
diff --git a/src/resources/fine-tuning/jobs/jobs.ts b/src/resources/fine-tuning/jobs/jobs.ts
index aeb646279..54b5c4e6a 100644
--- a/src/resources/fine-tuning/jobs/jobs.ts
+++ b/src/resources/fine-tuning/jobs/jobs.ts
@@ -340,7 +340,7 @@ export interface JobCreateParams {
   seed?: number | null;
 
   /**
-   * A string of up to 18 characters that will be added to your fine-tuned model
+   * A string of up to 64 characters that will be added to your fine-tuned model
    * name.
    *
    * For example, a `suffix` of "custom-model-name" would produce a model name like
diff --git a/tests/api-resources/chat/completions.test.ts b/tests/api-resources/chat/completions.test.ts
index 2179c52c3..692b953f2 100644
--- a/tests/api-resources/chat/completions.test.ts
+++ b/tests/api-resources/chat/completions.test.ts
@@ -32,6 +32,7 @@ describe('resource completions', () => {
       functions: [{ name: 'name', description: 'description', parameters: { foo: 'bar' } }],
       logit_bias: { foo: 0 },
       logprobs: true,
+      max_completion_tokens: 0,
       max_tokens: 0,
       n: 1,
       parallel_tool_calls: true,