diff --git a/src/cli/cli-installer.test.ts b/src/cli/cli-installer.test.ts
index d2458fc21..61f95b54f 100644
--- a/src/cli/cli-installer.test.ts
+++ b/src/cli/cli-installer.test.ts
@@ -156,6 +156,10 @@ describe("runCliInstaller", () => {
     expect(versionSpy).not.toHaveBeenCalled()
     expect(addPluginSpy).not.toHaveBeenCalled()
     expect(writeConfigSpy).not.toHaveBeenCalled()
+    const output = mockConsoleLog.mock.calls.map((call) => call.join(" ")).join("\n")
+    expect(output).not.toContain("Model Assignment")
+    expect(output).not.toContain("OpenAI/ChatGPT")
+    expect(output).not.toContain("Sisyphus agent performs best")
 
     detectSpy.mockRestore()
     installedSpy.mockRestore()
diff --git a/src/cli/cli-installer.ts b/src/cli/cli-installer.ts
index aa1fdf588..6c1b60032 100644
--- a/src/cli/cli-installer.ts
+++ b/src/cli/cli-installer.ts
@@ -116,7 +116,7 @@ export async function runCliInstaller(args: InstallArgs, version: string): Promi
 
   printBox(formatConfigSummary(config), isUpdate ? "Updated Configuration" : "Installation Complete")
 
-  if (!config.hasClaude) {
+  if (config.hasOpenCode && !config.hasClaude) {
     printInfo(
       "Note: Sisyphus agent performs best with Claude Opus 4.5+. " +
         "Other models work but may have reduced orchestration quality.",
@@ -124,6 +124,7 @@ export async function runCliInstaller(args: InstallArgs, version: string): Promi
   }
 
   if (
+    config.hasOpenCode &&
     !config.hasClaude &&
     !config.hasOpenAI &&
     !config.hasGemini &&
diff --git a/src/cli/install-codex/codex-config-toml.test.ts b/src/cli/install-codex/codex-config-toml.test.ts
index 65d792dde..8997379e2 100644
--- a/src/cli/install-codex/codex-config-toml.test.ts
+++ b/src/cli/install-codex/codex-config-toml.test.ts
@@ -24,6 +24,10 @@ describe("codex-config-toml", () => {
         "hide_world_writable_warning = false",
         "hide_rate_limit_model_nudge = true",
         "",
+        "[windows]",
+        'sandbox = "elevated"',
+        "wsl2_proxy = true",
+        "",
       ].join("\n"),
     )
 
@@ -46,8 +50,11 @@ describe("codex-config-toml", () => {
     expect(content).toContain("hide_full_access_warning = true")
     expect(content).toContain("hide_world_writable_warning = true")
     expect(content).toContain("hide_rate_limit_model_nudge = true")
+    expect(content).toContain("[windows]")
+    expect(content).toContain("wsl2_proxy = true")
     expect(content).not.toContain('approval_policy = "on-request"')
     expect(content).not.toContain('sandbox_mode = "workspace-write"')
+    expect(content).not.toContain('sandbox = "elevated"')
   })
 
   test("#given empty Codex config #when updating config #then enables MultiAgentV2 with ten thousand session threads", async () => {
diff --git a/src/cli/install-codex/codex-config-toml.ts b/src/cli/install-codex/codex-config-toml.ts
index 325fb7b65..ac3a60bdd 100644
--- a/src/cli/install-codex/codex-config-toml.ts
+++ b/src/cli/install-codex/codex-config-toml.ts
@@ -1,7 +1,7 @@
 import { mkdir, readFile, writeFile } from "node:fs/promises"
 import { dirname } from "node:path"
 import { ensureCodexMultiAgentV2Config } from "./codex-multi-agent-v2-config"
-import { appendBlock, findTomlSection, replaceOrInsertSetting } from "./toml-section-editor"
+import { appendBlock, findTomlSection, removeSetting, replaceOrInsertSetting } from "./toml-section-editor"
 import type { CodexAgentConfig, CodexMarketplaceSource, TrustedHookState } from "./types"
 
 const SISYPHUS_LEGACY_MARKETPLACES = ["lazycodex", "code-yeongyu-codex-plugins"] as const
@@ -115,10 +115,17 @@ function ensureAutonomousPermissions(config: string): string {
   let next = replaceOrInsertRootSetting(config, "approval_policy", JSON.stringify("never"))
   next = replaceOrInsertRootSetting(next, "sandbox_mode", JSON.stringify("danger-full-access"))
   next = replaceOrInsertRootSetting(next, "network_access", JSON.stringify("enabled"))
+  next = removeWindowsSandboxSetting(next)
   next = ensureNoticeEnabled(next, "hide_full_access_warning")
   return ensureNoticeEnabled(next, "hide_world_writable_warning")
 }
 
+function removeWindowsSandboxSetting(config: string): string {
+  const section = findTomlSection(config, "windows")
+  if (!section) return config
+  return removeSetting(config, section, "sandbox")
+}
+
 function ensureNoticeEnabled(config: string, key: string): string {
   const section = findTomlSection(config, "notice")
   if (!section) return appendBlock(config, `[notice]\n${key} = true\n`)
diff --git a/src/cli/install-validators.test.ts b/src/cli/install-validators.test.ts
index e2334c228..a103e9d2b 100644
--- a/src/cli/install-validators.test.ts
+++ b/src/cli/install-validators.test.ts
@@ -179,4 +179,20 @@ describe("formatConfigSummary", () => {
     expect(summary).toContain("Platform: both")
     expect(summary).not.toContain("Codex Harness")
   })
+
+  test("hides OpenCode model catalog for codex-only installs", () => {
+    // #given
+    const config = argsToConfig(createArgs({ platform: "codex", codexAutonomous: true }))
+
+    // #when
+    const summary = formatConfigSummary(config)
+
+    // #then
+    expect(summary).toContain("Platform: codex")
+    expect(summary).toContain("Codex autonomous mode: enabled")
+    expect(summary).not.toContain("Claude")
+    expect(summary).not.toContain("OpenAI/ChatGPT")
+    expect(summary).not.toContain("Model Assignment")
+    expect(summary).not.toContain("Models auto-configured")
+  })
 })
diff --git a/src/cli/install-validators.ts b/src/cli/install-validators.ts
index 7a91a18cb..ee5fb6fca 100644
--- a/src/cli/install-validators.ts
+++ b/src/cli/install-validators.ts
@@ -36,6 +36,9 @@ export function formatConfigSummary(config: InstallConfig): string {
   if (config.hasCodex) {
     lines.push(`  ${SYMBOLS.info} Codex autonomous mode: ${config.codexAutonomous ? "enabled" : "disabled"}`)
   }
+
+  if (!config.hasOpenCode) return lines.join("\n")
+
   lines.push("")
 
   const claudeDetail = config.hasClaude ? (config.isMax20 ? "max20" : "standard") : undefined
diff --git a/src/cli/tui-installer.ts b/src/cli/tui-installer.ts
index f24f96cbf..edb99aa77 100644
--- a/src/cli/tui-installer.ts
+++ b/src/cli/tui-installer.ts
@@ -96,14 +96,22 @@ export async function runTuiInstaller(args: InstallArgs, version: string): Promi
     spinner.stop(`Config written to ${color.cyan(omoResult.configPath)}`)
   }
 
-  if (!config.hasClaude) {
+  if (config.hasOpenCode && !config.hasClaude) {
     p.log.info(
       `${color.bold("Note:")} Sisyphus agent performs best with Claude Opus 4.5+.\n` +
         `Other models work but may have reduced orchestration quality.`,
     )
   }
 
-  if (!config.hasClaude && !config.hasOpenAI && !config.hasGemini && !config.hasCopilot && !config.hasOpencodeZen && !config.hasVercelAiGateway) {
+  if (
+    config.hasOpenCode &&
+    !config.hasClaude &&
+    !config.hasOpenAI &&
+    !config.hasGemini &&
+    !config.hasCopilot &&
+    !config.hasOpencodeZen &&
+    !config.hasVercelAiGateway
+  ) {
     p.log.warn("No model providers configured. Using opencode/big-pickle as fallback.")
   }