[Docs] Add OpenCode Go Qwen3.8 Max guide

docs/providers/index.json

@@ -90,6 +90,12 @@
       "extension": true,
       "cloud": false
     },
+    {
+      "id": "providers/opencode-go",
+      "title": "OpenCode Go",
+      "extension": true,
+      "cloud": false
+    },
     {
       "id": "providers/openrouter",
       "title": "OpenRouter",

docs/providers/opencode-go.md

@@ -0,0 +1,46 @@
+---
+sidebar_label: OpenCode Go
+description: Use OpenCode Go with Zoo Code for curated open coding models, including Qwen3.8 Max, through a low-cost subscription.
+keywords:
+  - opencode go
+  - qwen3.8 max
+  - coding models
+  - zoo code
+  - api provider
+---
+
+# Using OpenCode Go With Zoo Code
+
+OpenCode Go is a subscription provider for a curated set of open coding models. Zoo Code loads the current model catalog from OpenCode Go and applies model-specific context, reasoning, caching, and pricing metadata.
+
+**Website:** [https://opencode.ai/docs/go/](https://opencode.ai/docs/go/)
+
+---
+
+## Getting an API Key
+
+1. Sign in to the [OpenCode console](https://opencode.ai/auth).
+2. Subscribe to OpenCode Go.
+3. Copy your API key.
+4. In Zoo Code settings, select **Opencode Go** and enter the API key.
+
+---
+
+## Available Models
+
+The catalog includes **Qwen3.8 Max**, with multimodal input, a 1M-token context window, 128K maximum output, prompt caching, and streamed reasoning output.
+
+Zoo Code displays the model's streamed reasoning output. OpenCode Go does not currently provide a usable signed-thinking continuity field, so that reasoning is not replayed across requests.
+
+The model list is fetched dynamically and may change. See the [OpenCode Go documentation](https://opencode.ai/docs/go/) for current availability, usage limits, and pricing.
+
+---
+
+## Configuration in Zoo Code
+
+1. Open Zoo Code settings using the gear icon (<Codicon name="gear" />).
+2. Select **Opencode Go** from the API Provider dropdown.
+3. Enter your OpenCode Go API key.
+4. Refresh the model list and select a model.
+
+Zoo Code automatically uses the API protocol required by the selected model.