[Feat] Add GPT-6.1 Terra model support

apps/docs/models.mdx

@@ -163,6 +163,27 @@ Sol. OpenAI describes it as near-Astra performance at a lower cost. Existing
 defaults and saved mappings stay unchanged; differentiated recommendations that
 previously used GPT-6 Sol now use GPT-6.1 Sol.
 
+**GPT-6.1 Terra** is available through Roomote inference, OpenRouter,
+Vercel AI Gateway, OpenAI, Azure OpenAI, Azure AI Foundry, Requesty, and ChatGPT
+Subscription. Enable it in **Available Models**, then assign it to a role or
+select it for a session or task. Defaults and existing role mappings stay
+unchanged. Azure requires a deployment named `gpt-6.1-terra`; Requesty's curated
+route is `azure/gpt-6.1-terra@swedencentral`. Availability depends on account,
+region, plan, and rollout. OpenCode Zen, OpenCode Go, GitHub Copilot, and Amazon
+Bedrock are not yet included in Roomote's curated Terra routes.
+
+[OpenAI's model reference](https://developers.openai.com/api/docs/models/gpt-6.1-terra)
+lists a 1,050,000-token context window, a 922,000-token input limit, and up to
+128,000 output tokens, with text and image input and text output. Standard
+OpenAI API rates are $1 input, $0.05 cached input, and $5 output per million
+tokens; prompts over 272,000 input tokens incur higher rates. Provider pricing
+and limits can differ. Tool calling on the OpenAI route requires the Responses
+API. Roomote's model details refresh from provider catalogs as metadata becomes
+available.
+
+Terra supports ChatGPT Subscription's **Fast mode** when available to the
+connected plan. Selecting Terra on another route does not enable that option.
+
 **DeepSeek V4.1 Flash** is recommended through
 [DeepSeek](/providers/inference/deepseek),
 [OpenRouter](/providers/inference/openrouter),

apps/worker/src/run-task/agent-home.ts

@@ -55,6 +55,7 @@ import {
   mergeBedrockMantleProviderConfig,
   mergeCatalogProviderCredentialConfig,
   mergeKimiForCodingProviderConfig,
+  mergeCuratedOpenCodeModelConfig,
   mergeOpenAiCompatibleProviderConfig,
   mergeOpenCodeModelReasoningOptions,
   mergeOpenCodeChatGptFastModeOptions,
@@ -1740,12 +1741,15 @@ function resolveModelBackedOpenCodeConfig(
     // config entry or its cost block is silently dropped.
     ...Object.keys(modelCosts),
   ];
-  const providerModelConfig = chatGptFastMode
-    ? mergeOpenCodeChatGptFastModeOptions(
-        providerReasoningConfig,
-        configuredModelIds,
-      )
-    : providerReasoningConfig;
+  const providerModelConfig = mergeCuratedOpenCodeModelConfig(
+    chatGptFastMode
+      ? mergeOpenCodeChatGptFastModeOptions(
+          providerReasoningConfig,
+          configuredModelIds,
+        )
+      : providerReasoningConfig,
+    configuredModelIds,
+  );
   const providerConfig = mergeInferenceGatewayProviderConfig(
     // Binds the keys OpenCode would not find under its catalog's env var
     // names. Gateway mode replaces the key and base URL just above.

apps/worker/src/run-task/opencode-chatgpt-gateway-plugin-script.ts

@@ -16,6 +16,7 @@ const ALLOWED_MODELS = new Set([
   'gpt-6-astra',
   'gpt-6-sol',
   'gpt-6.1-sol',
+  'gpt-6.1-terra',
   'gpt-6-luna',
   'gpt-5.5',
   'gpt-5.3-codex-spark',

packages/cloud-agents/src/server/opencode-runtime.ts

@@ -16,6 +16,7 @@ import {
   mergeBedrockMantleProviderConfig,
   mergeCatalogProviderCredentialConfig,
   mergeKimiForCodingProviderConfig,
+  mergeCuratedOpenCodeModelConfig,
   mergeOpenAiCompatibleProviderConfig,
   mergeOpenCodeModelReasoningOptions,
   mergeOpenCodeChatGptFastModeOptions,
@@ -192,13 +193,15 @@ function buildModelBackedOpenCodeConfigContent(
   const configuredModelIds = NON_TASK_OPENCODE_MODEL_ROLES.map(
     (role) => roleConfig[role].model,
   );
-  const providerModelConfig =
+  const providerModelConfig = mergeCuratedOpenCodeModelConfig(
     env[CHATGPT_FAST_MODE_ENV_VAR_NAME]?.trim() === '1'
       ? mergeOpenCodeChatGptFastModeOptions(
           providerReasoningConfig,
           configuredModelIds,
         )
-      : providerReasoningConfig;
+      : providerReasoningConfig,
+    configuredModelIds,
+  );
   // Same Bedrock provider registrations the task worker applies: OpenCode's
   // catalog knows neither Mantle endpoint, and the native provider does not
   // read the deployment's bearer token on its own.
@@ -495,7 +498,7 @@ function mergeBedrockRegistrationsIntoConfigContent(
         mergeBedrockMantleOpenAiProviderConfig(
           mergeKimiForCodingProviderConfig(
             mergeCatalogProviderCredentialConfig(
-              existingProvider,
+              mergeCuratedOpenCodeModelConfig(existingProvider, roleModelIds),
               env,
               roleModelIds,
             ),

packages/types/src/chatgpt-subscription.ts

@@ -38,6 +38,7 @@ const CHATGPT_FAST_MODE_MODEL_IDS = new Set([
   'gpt-6-astra',
   'gpt-6-sol',
   'gpt-6.1-sol',
+  'gpt-6.1-terra',
   'gpt-6-luna',
   'gpt-5.4',
   'gpt-5.5',