feat(capacity-adapter): default vision fallback to mimo-v2.6-flash-free

Register mimo-v2.6-flash-free on opencode-zen (chat lane) with a v2.6
capability pattern, and switch the vision adapter default from the old
mimo-v2.5-free.

Co-Authored-By: Claude Code <noreply@anthropic.com>

open-sse/providers/capabilities.js

@@ -373,6 +373,7 @@ export const PATTERN_CAPABILITIES = [
   { pattern: "*minimax*",       caps: { reasoning: true, thinkingFormat: "minimax", thinkingCanDisable: false, contextWindow: 200000, maxOutput: 131072 } },
 
   // ── Xiaomi MiMo (vision + <think>-tag reasoning, always-on, can't disable) ──
+  { pattern: "*mimo*v2.6*",     caps: { vision: true, audioInput: true, videoInput: true, reasoning: true, thinkingFormat: "deepseek", thinkingCanDisable: false, contextWindow: 1048576, maxOutput: 131072 } },
   { pattern: "*mimo*v2.5*",     caps: { vision: true, audioInput: true, videoInput: true, reasoning: true, thinkingFormat: "deepseek", thinkingCanDisable: false, contextWindow: 1048576, maxOutput: 131072 } },
   { pattern: "*mimo*omni*",     caps: { vision: true, audioInput: true, reasoning: true, thinkingFormat: "deepseek", thinkingCanDisable: false, contextWindow: 262144, maxOutput: 131072 } },
   { pattern: "*mimo*",          caps: { vision: true, reasoning: true, thinkingFormat: "deepseek", thinkingCanDisable: false, contextWindow: 262144, maxOutput: 131072 } },

open-sse/providers/registry/opencode-zen.js

@@ -106,6 +106,7 @@ export default {
     { id: "union-alpha", name: "Union Alpha", supportedFormats: ["claude"] },
     // Free tier on the keyed lane (chat completions)
     { id: "deepseek-v4-flash-free", name: "DeepSeek V4 Flash Free", supportedFormats: ["openai"] },
+    { id: "mimo-v2.6-flash-free", name: "MiMo V2.6 Flash Free", supportedFormats: ["openai"] },
     { id: "mimo-v2.5-free", name: "MiMo V2.5 Free", supportedFormats: ["openai"] },
     { id: "ling-3.0-flash-fin-free", name: "Ling 3.0 Flash Fin Free", supportedFormats: ["openai"] },
     { id: "nemotron-3-ultra-free", name: "Nemotron 3 Ultra Free", supportedFormats: ["openai"] },
@@ -113,7 +114,18 @@ export default {
     // Free tier on the keyed lane (responses)
     { id: "muse-spark-1.3-contributor-free", name: "Muse Spark 1.3 Contributor Free", targetFormat: "openai-responses", supportedFormats: ["openai-responses"] },
     { id: "muse-spark-1.2-contributor-free", name: "Muse Spark 1.2 Contributor Free", targetFormat: "openai-responses", supportedFormats: ["openai-responses"] },
+    // System One (Jev) decision models on the native /systemone endpoint
+    { id: "jev-1.13", name: "Jev 1.13", kind: "decision" },
+    { id: "jev-1.13-free", name: "Jev 1.13 Free", kind: "decision" },
   ],
+  serviceKinds: ["llm", "systemone"],
+  systemoneConfig: {
+    baseUrl: "https://opencode.ai/zen/v1/systemone",
+    headers: {
+      "x-opencode-client": "desktop",
+      "User-Agent": "opencode/1.18.31",
+    },
+  },
   modelsFetcher: { url: "https://opencode.ai/zen/v1/models", type: "opencode-free" },
   passthroughModels: true,
   features: {

open-sse/services/capacityAdapter.js

@@ -12,7 +12,7 @@ import { getCapabilitiesForModel } from "../providers/capabilities.js";
 
 const CAPABILITY_KEYS = ["vision", "pdf", "audioInput", "videoInput"];
 const HARD_CAPS = new Set(CAPABILITY_KEYS);
-const DEFAULT_FALLBACK_MODEL = "oc/mimo-v2.5-free";
+const DEFAULT_FALLBACK_MODEL = "oc/mimo-v2.6-flash-free";
 
 // Normalize a capability entry to { enabled, roundRobin, models }. Backward-compat:
 // accept the legacy array form [{model, enabled}] (treated as enabled, fallback).

src/app/(dashboard)/dashboard/combos/page.js

@@ -21,7 +21,7 @@ const CAPACITY_ADAPTER_CAPS = [
   // pdf, videoInput temporarily hidden — no translator support yet for those blocks.
   { key: "audioInput", label: "Audio", icon: "graphic_eq", desc: "Audio input" },
 ];
-const DEFAULT_FALLBACK_MODEL = "oc/mimo-v2.5-free";
+const DEFAULT_FALLBACK_MODEL = "oc/mimo-v2.6-flash-free";
 const EMPTY_CAP_ENTRY = { enabled: true, roundRobin: false, models: [] };
 const EMPTY_CAPACITY_ADAPTER = {
   vision: { ...EMPTY_CAP_ENTRY },

tests/unit/opencode-zen-models.test.js

@@ -9,7 +9,7 @@ const CHAT_ONLY = ["deepseek-v4-pro", "deepseek-v4-flash", "deepseek-v4-flash-vi
   "minimax-m3", "minimax-m2.7", "minimax-m2.5",
   "kimi-k3", "kimi-k2.7-code", "kimi-k2.6", "kimi-k2.5",
   "big-pickle", "deepseek-v4-flash-free",
-  "mimo-v2.5-free", "ling-3.0-flash-fin-free", "nemotron-3-ultra-free", "nemotron-3.5-lightning-free"];
+  "mimo-v2.6-flash-free", "mimo-v2.5-free", "ling-3.0-flash-fin-free", "nemotron-3-ultra-free", "nemotron-3.5-lightning-free"];
 // Models that also expose the Anthropic /messages endpoint
 const CLAUDE_CAPABLE = ["claude-fable-5", "claude-fable-5-1", "claude-opus-5",
   "claude-opus-4-8", "claude-opus-4-7", "claude-opus-4-6", "claude-opus-4-5",