feat: Support gpt-5.1-codex-max and xhigh reasoning

README.md

@@ -33,7 +33,7 @@ Follow me on [X @nummanthinks](https://x.com/nummanthinks) for future updates an
 ## Features
 
 - ✅ **ChatGPT Plus/Pro OAuth authentication** - Use your existing subscription
-- ✅ **8 pre-configured GPT 5.1 variants** - GPT 5.1, GPT 5.1 Codex, and GPT 5.1 Codex Mini presets for common reasoning levels
+- ✅ **12 pre-configured GPT 5.1 variants** - GPT 5.1 Codex Max, GPT 5.1, GPT 5.1 Codex, and GPT 5.1 Codex Mini presets
 - ⚠️ **GPT 5.1 only** - Older GPT 5.0 models are deprecated and may not work reliably
 - ✅ **Zero external dependencies** - Lightweight with only @openauthjs/openauth
 - ✅ **Auto-refreshing tokens** - Handles token expiration automatically
@@ -82,6 +82,70 @@ Follow me on [X @nummanthinks](https://x.com/nummanthinks) for future updates an
         "store": false
       },
       "models": {
+        "gpt-5.1-codex-max-low": {
+          "name": "GPT 5.1 Codex Max Low (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "low",
+            "reasoningSummary": "auto",
+            "textVerbosity": "medium",
+            "include": [
+              "reasoning.encrypted_content"
+            ],
+            "store": false
+          }
+        },
+        "gpt-5.1-codex-max-medium": {
+          "name": "GPT 5.1 Codex Max Medium (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "medium",
+            "reasoningSummary": "auto",
+            "textVerbosity": "medium",
+            "include": [
+              "reasoning.encrypted_content"
+            ],
+            "store": false
+          }
+        },
+        "gpt-5.1-codex-max-high": {
+          "name": "GPT 5.1 Codex Max High (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "high",
+            "reasoningSummary": "detailed",
+            "textVerbosity": "medium",
+            "include": [
+              "reasoning.encrypted_content"
+            ],
+            "store": false
+          }
+        },
+        "gpt-5.1-codex-max-xhigh": {
+          "name": "GPT 5.1 Codex Max XHigh (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "xhigh",
+            "reasoningSummary": "detailed",
+            "textVerbosity": "medium",
+            "include": [
+              "reasoning.encrypted_content"
+            ],
+            "store": false
+          }
+        },
         "gpt-5.1-codex-low": {
           "name": "GPT 5.1 Codex Low (OAuth)",
           "limit": {
@@ -219,12 +283,13 @@ Follow me on [X @nummanthinks](https://x.com/nummanthinks) for future updates an
    **Global config**: `~/.config/opencode/opencode.json`
    **Project config**: `<project>/.opencode.json`
 
-   This gives you 8 GPT 5.1 variants with different reasoning levels:
+   This gives you 12 GPT 5.1 variants with different reasoning levels:
+   - **gpt-5.1-codex-max** (low/medium/high/xhigh) - Latest Codex-optimized flagship for deep reasoning
    - **gpt-5.1-codex** (low/medium/high) - Latest Codex model presets
    - **gpt-5.1-codex-mini** (medium/high) - Latest Codex mini tier presets
    - **gpt-5.1** (low/medium/high) - Latest general-purpose reasoning presets
 
-   All appear in the opencode model selector as "GPT 5.1 Codex Low (OAuth)", "GPT 5.1 High (OAuth)", etc.
+   All appear in the opencode model selector as "GPT 5.1 Codex Max Low (OAuth)", "GPT 5.1 Codex Low (OAuth)", etc.
 
 ### Prompt caching & usage limits
 
@@ -290,6 +355,10 @@ Check [releases](https://github.com/numman-ali/opencode-openai-codex-auth/releas
 If using the full configuration, select from the model picker in opencode, or specify via command line:
 
 ```bash
+# Use different reasoning levels for gpt-5.1-codex-max
+opencode run "complex architectural task" --model=openai/gpt-5.1-codex-max-xhigh
+opencode run "refactor codebase" --model=openai/gpt-5.1-codex-max-high
+
 # Use different reasoning levels for gpt-5.1-codex
 opencode run "simple task" --model=openai/gpt-5.1-codex-low
 opencode run "complex task" --model=openai/gpt-5.1-codex-high
@@ -309,6 +378,10 @@ When using [`config/full-opencode.json`](./config/full-opencode.json), you get t
 
 | CLI Model ID | TUI Display Name | Reasoning Effort | Best For |
 |--------------|------------------|-----------------|----------|
+| `gpt-5.1-codex-max-low` | GPT 5.1 Codex Max Low (OAuth) | Low | Fast responses with lighter reasoning |
+| `gpt-5.1-codex-max-medium` | GPT 5.1 Codex Max Medium (OAuth) | Medium | Balanced speed and reasoning depth |
+| `gpt-5.1-codex-max-high` | GPT 5.1 Codex Max High (OAuth) | High | Complex problems |
+| `gpt-5.1-codex-max-xhigh` | GPT 5.1 Codex Max XHigh (OAuth) | XHigh | Extra high reasoning depth |
 | `gpt-5.1-codex-low` | GPT 5.1 Codex Low (OAuth) | Low | Fast code generation |
 | `gpt-5.1-codex-medium` | GPT 5.1 Codex Medium (OAuth) | Medium | Balanced code tasks |
 | `gpt-5.1-codex-high` | GPT 5.1 Codex High (OAuth) | High | Complex code & tools |
@@ -364,7 +437,7 @@ These defaults match the official Codex CLI behavior and can be customized (see
 ### ⚠️ REQUIRED: Use Pre-Configured File
 
 **YOU MUST use [`config/full-opencode.json`](./config/full-opencode.json)** - this is the only officially supported configuration:
-- 8 pre-configured GPT 5.1 model variants with verified settings
+- 12 pre-configured GPT 5.1 model variants with verified settings
 - Optimal configuration for each reasoning level
 - All variants visible in the opencode model selector
 - Required metadata for OpenCode features to work properly
@@ -379,16 +452,16 @@ If you want to customize settings yourself, you can configure options at provide
 
 #### Available Settings
 
-⚠️ **Important**: The two base models have different supported values.
+⚠️ **Important**: The base models have different supported values.
 
-| Setting | GPT-5 Values | GPT-5-Codex Values | Plugin Default |
-|---------|-------------|-------------------|----------------|
-| `reasoningEffort` | `minimal`, `low`, `medium`, `high` | `low`, `medium`, `high` | `medium` |
-| `reasoningSummary` | `auto`, `detailed` | `auto`, `detailed` | `auto` |
-| `textVerbosity` | `low`, `medium`, `high` | `medium` only | `medium` |
-| `include` | Array of strings | Array of strings | `["reasoning.encrypted_content"]` |
+| Setting | GPT-5-Codex-Max Values | GPT-5 Values | GPT-5-Codex Values | Plugin Default |
+|---------|------------------------|-------------|-------------------|----------------|
+| `reasoningEffort` | `low`, `medium`, `high`, `xhigh` | `minimal`, `low`, `medium`, `high` | `low`, `medium`, `high` | `medium` |
+| `reasoningSummary` | `auto`, `detailed` | `auto`, `detailed` | `auto`, `detailed` | `auto` |
+| `textVerbosity` | `medium` only | `low`, `medium`, `high` | `medium` only | `medium` |
+| `include` | Array of strings | Array of strings | Array of strings | `["reasoning.encrypted_content"]` |
 
-> **Note**: `minimal` effort is auto-normalized to `low` for gpt-5-codex (not supported by the API).
+> **Note**: `minimal` effort is auto-normalized to `low` for gpt-5-codex (not supported by the API). `gpt-5.1-codex-max` supports `xhigh`.
 
 #### Global Configuration Example
 

config/README.md

@@ -14,13 +14,13 @@ cp config/full-opencode.json ~/.config/opencode/opencode.json
 
 **Why this is required:**
 - GPT 5 models can be temperamental and need proper configuration
-- Contains 8 verified GPT 5.1 model variants (Codex, Codex Mini, and general GPT 5.1)
+- Contains 12 verified GPT 5.1 model variants (Codex Max, Codex, Codex Mini, and general GPT 5.1)
 - Includes all required metadata for OpenCode features
 - Guaranteed to work reliably
 - Global options for all models + per-model configuration overrides
 
 **What's included:**
-- All supported GPT 5.1 variants: gpt-5.1, gpt-5.1-codex, gpt-5.1-codex-mini
+- All supported GPT 5.1 variants: gpt-5.1-codex-max, gpt-5.1, gpt-5.1-codex, gpt-5.1-codex-mini
 - Proper reasoning effort settings for each variant
 - Context limits (272k context / 128k output)
 - Required options: `store: false`, `include: ["reasoning.encrypted_content"]`

config/full-opencode.json

@@ -15,6 +15,70 @@
         "store": false
       },
       "models": {
+        "gpt-5.1-codex-max-low": {
+          "name": "GPT 5.1 Codex Max Low (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "low",
+            "reasoningSummary": "auto",
+            "textVerbosity": "medium",
+            "include": [
+              "reasoning.encrypted_content"
+            ],
+            "store": false
+          }
+        },
+        "gpt-5.1-codex-max-medium": {
+          "name": "GPT 5.1 Codex Max Medium (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "medium",
+            "reasoningSummary": "auto",
+            "textVerbosity": "medium",
+            "include": [
+              "reasoning.encrypted_content"
+            ],
+            "store": false
+          }
+        },
+        "gpt-5.1-codex-max-high": {
+          "name": "GPT 5.1 Codex Max High (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "high",
+            "reasoningSummary": "detailed",
+            "textVerbosity": "medium",
+            "include": [
+              "reasoning.encrypted_content"
+            ],
+            "store": false
+          }
+        },
+        "gpt-5.1-codex-max-xhigh": {
+          "name": "GPT 5.1 Codex Max XHigh (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "xhigh",
+            "reasoningSummary": "detailed",
+            "textVerbosity": "medium",
+            "include": [
+              "reasoning.encrypted_content"
+            ],
+            "store": false
+          }
+        },
         "gpt-5.1-codex-low": {
           "name": "GPT 5.1 Codex Low (OAuth)",
           "limit": {

docs/configuration.md

@@ -18,6 +18,20 @@ Complete reference for configuring the OpenCode OpenAI Codex Auth Plugin.
         "store": false
       },
       "models": {
+        "gpt-5.1-codex-max-low": {
+          "name": "GPT 5.1 Codex Max Low (OAuth)",
+          "limit": {
+            "context": 272000,
+            "output": 128000
+          },
+          "options": {
+            "reasoningEffort": "low",
+            "reasoningSummary": "auto",
+            "textVerbosity": "medium",
+            "include": ["reasoning.encrypted_content"],
+            "store": false
+          }
+        },
         "gpt-5.1-codex-low": {
           "name": "GPT 5.1 Codex Low (OAuth)",
           "limit": {
@@ -46,6 +60,12 @@ Complete reference for configuring the OpenCode OpenAI Codex Auth Plugin.
 
 Controls computational effort for reasoning.
 
+**GPT-5.1-Codex-Max Values:**
+- `low` - Fast responses
+- `medium` - Balanced (default)
+- `high` - Deep reasoning
+- `xhigh` - Extra high reasoning depth
+
 **GPT-5 Values:**
 - `minimal` - Fastest, least reasoning
 - `low` - Light reasoning
@@ -60,12 +80,13 @@ Controls computational effort for reasoning.
 **Notes**:
 - `minimal` auto-converts to `low` for gpt-5-codex (API limitation)
 - `gpt-5-codex-mini*` and `gpt-5.1-codex-mini*` only support `medium` or `high`; lower settings are clamped to `medium`
+- `xhigh` is only supported by `gpt-5.1-codex-max`
 
 **Example:**
 ```json
 {
   "options": {
-    "reasoningEffort": "high"
+    "reasoningEffort": "xhigh"
   }
 }
 ```
@@ -96,7 +117,7 @@ Controls output length.
 - `medium` - Balanced (default)
 - `high` - Verbose
 
-**GPT-5-Codex:**
+**GPT-5-Codex & GPT-5.1-Codex-Max:**
 - `medium` only (API limitation)
 
 **Example:**

lib/request/helpers/model-map.ts

@@ -12,6 +12,15 @@
  * Value: The normalized model name to send to the API
  */
 export const MODEL_MAP: Record<string, string> = {
+	// ============================================================================
+	// GPT-5.1 Codex Max Models
+	// ============================================================================
+	"gpt-5.1-codex-max": "gpt-5.1-codex-max",
+	"gpt-5.1-codex-max-low": "gpt-5.1-codex-max",
+	"gpt-5.1-codex-max-medium": "gpt-5.1-codex-max",
+	"gpt-5.1-codex-max-high": "gpt-5.1-codex-max",
+	"gpt-5.1-codex-max-xhigh": "gpt-5.1-codex-max",
+
 	// ============================================================================
 	// GPT-5.1 Codex Models
 	// ============================================================================

lib/request/request-transformer.ts

@@ -38,15 +38,23 @@ export function normalizeModel(model: string | undefined): string {
 	const normalized = modelId.toLowerCase();
 
 	// Priority order for pattern matching (most specific first):
-	// 1. GPT-5.1 Codex Mini
+	// 1. GPT-5.1 Codex Max
+	if (
+		normalized.includes("gpt-5.1-codex-max") ||
+		normalized.includes("gpt 5.1 codex max")
+	) {
+		return "gpt-5.1-codex-max";
+	}
+
+	// 2. GPT-5.1 Codex Mini
 	if (
 		normalized.includes("gpt-5.1-codex-mini") ||
 		normalized.includes("gpt 5.1 codex mini")
 	) {
 		return "gpt-5.1-codex-mini";
 	}
 
-	// 2. Legacy Codex Mini
+	// 3. Legacy Codex Mini
 	if (
 		normalized.includes("codex-mini-latest") ||
 		normalized.includes("gpt-5-codex-mini") ||
@@ -129,7 +137,7 @@ export function getReasoningConfig(
 			normalizedOriginal.includes("mini"));
 
 	// Default based on model type (Codex CLI defaults)
-	const defaultEffort: "minimal" | "low" | "medium" | "high" = isCodexMini
+	const defaultEffort: "minimal" | "low" | "medium" | "high" | "xhigh" = isCodexMini
 		? "medium"
 		: isLightweight
 			? "minimal"

lib/types.ts

@@ -27,7 +27,7 @@ export interface UserConfig {
  * Configuration options for reasoning and text settings
  */
 export interface ConfigOptions {
-	reasoningEffort?: "minimal" | "low" | "medium" | "high";
+	reasoningEffort?: "minimal" | "low" | "medium" | "high" | "xhigh";
 	reasoningSummary?: "auto" | "concise" | "detailed";
 	textVerbosity?: "low" | "medium" | "high";
 	include?: string[];
@@ -37,7 +37,7 @@ export interface ConfigOptions {
  * Reasoning configuration for requests
  */
 export interface ReasoningConfig {
-	effort: "minimal" | "low" | "medium" | "high";
+	effort: "minimal" | "low" | "medium" | "high" | "xhigh";
 	summary: "auto" | "concise" | "detailed";
 }