Support GPT-5.1: smarter, faster, and more conversational for complex tasks (#1783)

Added to OpenAI and Azure

GPT-5.1: adaptive reasoning 
GPT-5.1-codex: advanced coding workflows
GPT-5.1-codex-mini: compact and efficient








<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Added support for OpenAI and Azure GPT-5.1, including GPT-5.1 Codex and
Codex Mini, for smarter conversations and better coding tasks. All
models use a 400k context window, require temperature 1, and leave max
output tokens unspecified to align with API behavior.

<sup>Written for commit 9788541c88732aa7d522fc70bfb20f22c3544982.
Summary will update automatically on new commits.</sup>

<!-- End of auto-generated description by cubic. -->








<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds GPT-5.1, GPT-5.1 Codex, and Codex Mini to OpenAI and Azure model
catalogs with 400k context and temperature 1 (max output tokens
unspecified).
> 
> - **Model registry updates
(`src/ipc/shared/language_model_constants.ts`)**:
>   - **OpenAI**:
> - Add `gpt-5.1`, `gpt-5.1-codex`, `gpt-5.1-codex-mini` (400k
`contextWindow`, `temperature: 1`, `maxOutputTokens: undefined`).
> - Keep existing `gpt-5`, `gpt-5-codex`, `gpt-5-mini`, `gpt-5-nano`,
`o4-mini`.
>   - **Azure**:
> - Add `gpt-5.1`, `gpt-5.1-codex`, `gpt-5.1-codex-mini` with matching
settings (400k `contextWindow`, `temperature: 1`).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
9788541c88732aa7d522fc70bfb20f22c3544982. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Will Chen <willchen90@gmail.com>

src/ipc/shared/language_model_constants.ts

@@ -20,11 +20,12 @@ export interface ModelOption {
 
 export const MODEL_OPTIONS: Record<string, ModelOption[]> = {
   openai: [
-    // https://platform.openai.com/docs/models/gpt-5-codex
+    // https://platform.openai.com/docs/models/gpt-5.1
     {
-      name: "gpt-5-codex",
-      displayName: "GPT 5 Codex",
-      description: "OpenAI's flagship model optimized for coding",
+      name: "gpt-5.1",
+      displayName: "GPT 5.1",
+      description:
+        "OpenAI's flagship model- smarter, faster, and more conversational",
       // Technically it's 128k but OpenAI errors if you set max_tokens instead of max_completion_tokens
       maxOutputTokens: undefined,
       contextWindow: 400_000,
@@ -32,6 +33,31 @@ export const MODEL_OPTIONS: Record<string, ModelOption[]> = {
       temperature: 1,
       dollarSigns: 3,
     },
+    // https://platform.openai.com/docs/models/gpt-5.1-codex
+    {
+      name: "gpt-5.1-codex",
+      displayName: "GPT 5.1 Codex",
+      description: "OpenAI's advanced coding workflows",
+      // Technically it's 128k but OpenAI errors if you set max_tokens instead of max_completion_tokens
+      maxOutputTokens: undefined,
+      contextWindow: 400_000,
+      // Requires temperature to be default value (1)
+      temperature: 1,
+      dollarSigns: 3,
+    },
+    // https://platform.openai.com/docs/models/gpt-5.1-codex-mini
+    {
+      name: "gpt-5.1-codex-mini",
+      displayName: "GPT 5.1 Codex Mini",
+      description: "OpenAI's compact and efficient coding model",
+      // Technically it's 128k but OpenAI errors if you set max_tokens instead of max_completion_tokens
+      maxOutputTokens: undefined,
+      contextWindow: 400_000,
+      // Requires temperature to be default value (1)
+      temperature: 1,
+      dollarSigns: 2,
+    },
+
     // https://platform.openai.com/docs/models/gpt-5
     {
       name: "gpt-5",
@@ -44,6 +70,18 @@ export const MODEL_OPTIONS: Record<string, ModelOption[]> = {
       temperature: 1,
       dollarSigns: 3,
     },
+    // https://platform.openai.com/docs/models/gpt-5-codex
+    {
+      name: "gpt-5-codex",
+      displayName: "GPT 5 Codex",
+      description: "OpenAI's flagship model optimized for coding",
+      // Technically it's 128k but OpenAI errors if you set max_tokens instead of max_completion_tokens
+      maxOutputTokens: undefined,
+      contextWindow: 400_000,
+      // Requires temperature to be default value (1)
+      temperature: 1,
+      dollarSigns: 3,
+    },
     // https://platform.openai.com/docs/models/gpt-5-mini
     {
       name: "gpt-5-mini",
@@ -297,6 +335,33 @@ export const MODEL_OPTIONS: Record<string, ModelOption[]> = {
     },
   ],
   azure: [
+    {
+      name: "gpt-5.1",
+      displayName: "GPT-5.1",
+      description: "Azure OpenAI GPT-5.1 model",
+      // See OpenAI comment above
+      // maxOutputTokens: 128_000,
+      contextWindow: 400_000,
+      temperature: 1,
+    },
+    {
+      name: "gpt-5.1-codex",
+      displayName: "GPT-5.1 Codex",
+      description: "Azure OpenAI GPT-5.1 Codex model",
+      // See OpenAI comment above
+      // maxOutputTokens: 128_000,
+      contextWindow: 400_000,
+      temperature: 1,
+    },
+    {
+      name: "gpt-5.1-codex-mini",
+      displayName: "GPT-5.1 Codex Mini",
+      description: "Azure OpenAI GPT-5.1 Codex Mini model",
+      // See OpenAI comment above
+      // maxOutputTokens: 128_000,
+      contextWindow: 400_000,
+      temperature: 1,
+    },
     {
       name: "gpt-5-codex",
       displayName: "GPT-5 Codex",