Enable OpenCode Zen for minimax + kimi; add buffbench agents (#624)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jahooma

common/src/constants/model-config.ts

@@ -54,7 +54,6 @@ export type openrouterModel =
   (typeof openrouterModels)[keyof typeof openrouterModels]
 
 export const openCodeZenModels = {
-  opencode_minimax_m2_7: 'opencode/minimax-m2.7',
   opencode_kimi_k2_6: 'opencode/kimi-k2.6',
 } as const
 export type OpenCodeZenModel =

web/src/app/api/v1/chat/completions/__tests__/completions.test.ts

@@ -869,10 +869,9 @@ describe('/api/v1/chat/completions POST endpoint', () => {
     )
 
     it(
-      'routes opencode/-prefixed models to the OpenCode Zen provider',
+      'routes OpenCode Zen models to the direct OpenCode Zen provider',
       async () => {
         const expectedUpstreamModel: Record<string, string> = {
-          'opencode/minimax-m2.7': 'minimax-m2.7',
           'opencode/kimi-k2.6': 'kimi-k2.6',
         }
 

web/src/llm-api/opencode-zen.ts

@@ -38,14 +38,6 @@ const OPENCODE_ZEN_MODELS: Record<
   string,
   { opencodeId: string; pricing: OpenCodeZenPricing }
 > = {
-  [openCodeZenModels.opencode_minimax_m2_7]: {
-    opencodeId: 'minimax-m2.7',
-    pricing: {
-      inputCostPerToken: 0.3 / 1_000_000,
-      cachedInputCostPerToken: 0.06 / 1_000_000,
-      outputCostPerToken: 1.2 / 1_000_000,
-    },
-  },
   [openCodeZenModels.opencode_kimi_k2_6]: {
     opencodeId: 'kimi-k2.6',
     pricing: {
@@ -56,17 +48,12 @@ const OPENCODE_ZEN_MODELS: Record<
   },
 }
 
-const OPENCODE_ZEN_MODEL_PREFIX = 'opencode/'
-
-export function isOpenCodeZenModel(model: unknown): model is string {
-  return typeof model === 'string' && model.startsWith(OPENCODE_ZEN_MODEL_PREFIX)
+export function isOpenCodeZenModel(model: string): boolean {
+  return model in OPENCODE_ZEN_MODELS
 }
 
 function getOpenCodeZenModelId(model: string): string {
-  return (
-    OPENCODE_ZEN_MODELS[model]?.opencodeId ??
-    model.slice(OPENCODE_ZEN_MODEL_PREFIX.length)
-  )
+  return OPENCODE_ZEN_MODELS[model]?.opencodeId ?? model
 }
 
 function getOpenCodeZenPricing(model: string): OpenCodeZenPricing {