diff --git a/.env.example b/.env.example
index 51cfa1a..befec14 100644
--- a/.env.example
+++ b/.env.example
@@ -55,7 +55,8 @@ OPENROUTER_API_KEY=your_openrouter_api_key_here
 
 # Optional: Default model to use
 # Options: 'auto' (Claude picks best model), 'pro', 'flash', 'o3', 'o3-mini', 'o4-mini', 'o4-mini-high',
-#          'gpt-5', 'gpt-5-mini', 'grok', 'opus-4.1', 'sonnet-4.1', or any DIAL model if DIAL is configured
+#          'gpt-5.1', 'gpt-5.1-codex', 'gpt-5.1-codex-mini', 'gpt-5', 'gpt-5-mini', 'grok',
+#          'opus-4.1', 'sonnet-4.1', or any DIAL model if DIAL is configured
 # When set to 'auto', Claude will select the best model for each task
 # Defaults to 'auto' if not specified
 DEFAULT_MODEL=auto
@@ -79,12 +80,15 @@ DEFAULT_THINKING_MODE_THINKDEEP=high
 # If you want to disable a provider entirely, don't set its API key
 #
 # Supported OpenAI models:
+#   - gpt-5.1          (400K context, 128K output, reasoning tokens, streaming enabled)
+#   - gpt-5.1-codex    (400K context, 128K output, coding specialization, Responses API only)
+#   - gpt-5.1-codex-mini (400K context, 128K output, cost-efficient Codex with streaming)
+#   - gpt-5            (400K context, 128K output, reasoning tokens)
+#   - gpt-5-mini       (400K context, 128K output, reasoning tokens)
 #   - o3               (200K context, high reasoning)
 #   - o3-mini          (200K context, balanced)
 #   - o4-mini          (200K context, latest balanced, temperature=1.0 only)
 #   - o4-mini-high     (200K context, enhanced reasoning, temperature=1.0 only)
-#   - gpt-5            (400K context, 128K output, reasoning tokens)
-#   - gpt-5-mini       (400K context, 128K output, reasoning tokens)
 #   - mini             (shorthand for o4-mini)
 #
 # Supported Google/Gemini models:
@@ -122,6 +126,7 @@ DEFAULT_THINKING_MODE_THINKDEEP=high
 #
 # Examples:
 #   OPENAI_ALLOWED_MODELS=o3-mini,o4-mini,mini  # Only allow mini models (cost control)
+#   OPENAI_ALLOWED_MODELS=gpt-5.1,gpt-5.1-codex  # Pin to GPT-5.1 family
 #   GOOGLE_ALLOWED_MODELS=flash                  # Only allow Flash (fast responses)
 #   XAI_ALLOWED_MODELS=grok-3                    # Only allow standard GROK (not fast variant)
 #   OPENAI_ALLOWED_MODELS=o4-mini                # Single model standardization