tweak: move the max token exclusions to plugins @rekram1-node (#21225)

packages/opencode/src/plugin/codex.ts

@@ -599,5 +599,10 @@ export async function CodexAuthPlugin(input: PluginInput): Promise<Hooks> {
       output.headers["User-Agent"] = `opencode/${Installation.VERSION} (${os.platform()} ${os.release()}; ${os.arch()})`
       output.headers.session_id = input.sessionID
     },
+    "chat.params": async (input, output) => {
+      if (input.model.providerID !== "openai") return
+      // Match codex cli
+      output.maxOutputTokens = undefined
+    },
   }
 }

packages/opencode/src/plugin/github-copilot/copilot.ts

@@ -309,6 +309,14 @@ export async function CopilotAuthPlugin(input: PluginInput): Promise<Hooks> {
         },
       ],
     },
+    "chat.params": async (incoming, output) => {
+      if (!incoming.model.providerID.includes("github-copilot")) return
+
+      // Match github copilot cli, omit maxOutputTokens for gpt models
+      if (incoming.model.api.id.includes("gpt")) {
+        output.maxOutputTokens = undefined
+      }
+    },
     "chat.headers": async (incoming, output) => {
       if (!incoming.model.providerID.includes("github-copilot")) return