fix(opencode): add input limit for compaction (#8465)

packages/opencode/src/plugin/codex.ts

@@ -361,38 +361,6 @@ export async function CodexAuthPlugin(input: PluginInput): Promise<Hooks> {
           }
         }
 
-        if (!provider.models["gpt-5.2-codex"]) {
-          const model = {
-            id: "gpt-5.2-codex",
-            providerID: "openai",
-            api: {
-              id: "gpt-5.2-codex",
-              url: "https://chatgpt.com/backend-api/codex",
-              npm: "@ai-sdk/openai",
-            },
-            name: "GPT-5.2 Codex",
-            capabilities: {
-              temperature: false,
-              reasoning: true,
-              attachment: true,
-              toolcall: true,
-              input: { text: true, audio: false, image: true, video: false, pdf: false },
-              output: { text: true, audio: false, image: false, video: false, pdf: false },
-              interleaved: false,
-            },
-            cost: { input: 0, output: 0, cache: { read: 0, write: 0 } },
-            limit: { context: 400000, output: 128000 },
-            status: "active" as const,
-            options: {},
-            headers: {},
-            release_date: "2025-12-18",
-            variants: {} as Record<string, Record<string, any>>,
-            family: "gpt-codex",
-          }
-          model.variants = ProviderTransform.variants(model)
-          provider.models["gpt-5.2-codex"] = model
-        }
-
         // Zero out costs for Codex (included with ChatGPT subscription)
         for (const model of Object.values(provider.models)) {
           model.cost = {

packages/opencode/src/provider/models.ts

@@ -47,6 +47,7 @@ export namespace ModelsDev {
       .optional(),
     limit: z.object({
       context: z.number(),
+      input: z.number().optional(),
       output: z.number(),
     }),
     modalities: z

packages/opencode/src/provider/provider.ts

@@ -557,6 +557,7 @@ export namespace Provider {
       }),
       limit: z.object({
         context: z.number(),
+        input: z.number().optional(),
         output: z.number(),
       }),
       status: z.enum(["alpha", "beta", "deprecated", "active"]),
@@ -619,6 +620,7 @@ export namespace Provider {
       },
       limit: {
         context: model.limit.context,
+        input: model.limit.input,
         output: model.limit.output,
       },
       capabilities: {

packages/opencode/src/session/compaction.ts

@@ -34,7 +34,7 @@ export namespace SessionCompaction {
     if (context === 0) return false
     const count = input.tokens.input + input.tokens.cache.read + input.tokens.output
     const output = Math.min(input.model.limit.output, SessionPrompt.OUTPUT_TOKEN_MAX) || SessionPrompt.OUTPUT_TOKEN_MAX
-    const usable = context - output
+    const usable = input.model.limit.input || context - output
     return count > usable
   }