feat: add Opus [1M] model option to model selector

Adds opus[1m] to the Claude model options alongside the existing sonnet[1m],
allowing users to select the Opus model with 1M context window.

Closes #579

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: gumab

server/claude-sdk.js

@@ -193,7 +193,7 @@ function mapCliOptionsToSDK(options = {}) {
   sdkOptions.disallowedTools = settings.disallowedTools || [];
 
   // Map model (default to sonnet)
-  // Valid models: sonnet, opus, haiku, opusplan, sonnet[1m]
+  // Valid models: sonnet, opus, haiku, opusplan, sonnet[1m], opus[1m]
   sdkOptions.model = options.model || CLAUDE_MODELS.DEFAULT;
   // Model logged at query start below
 

server/routes/agent.js

@@ -643,7 +643,7 @@ class ResponseCollector {
  *
  * @param {string} model - (Optional) Model identifier for providers.
  *
- *                        Claude models: 'sonnet' (default), 'opus', 'haiku', 'opusplan', 'sonnet[1m]'
+ *                        Claude models: 'sonnet' (default), 'opus', 'haiku', 'opusplan', 'sonnet[1m]', 'opus[1m]'
  *                        Cursor models: 'gpt-5' (default), 'gpt-5.2', 'gpt-5.2-high', 'sonnet-4.5', 'opus-4.5',
  *                                       'gemini-3-pro', 'composer-1', 'auto', 'gpt-5.1', 'gpt-5.1-high',
  *                                       'gpt-5.1-codex', 'gpt-5.1-codex-high', 'gpt-5.1-codex-max',

shared/modelConstants.js

@@ -18,6 +18,7 @@ export const CLAUDE_MODELS = {
     { value: "haiku", label: "Haiku" },
     { value: "opusplan", label: "Opus Plan" },
     { value: "sonnet[1m]", label: "Sonnet [1M]" },
+    { value: "opus[1m]", label: "Opus [1M]" },
   ],
 
   DEFAULT: "sonnet",