diff --git a/apps/cli/README.md b/apps/cli/README.md
index 76e66573eb..740fb79ea8 100644
--- a/apps/cli/README.md
+++ b/apps/cli/README.md
@@ -157,7 +157,7 @@ Tokens are valid for 90 days. The CLI will prompt you to re-authenticate when yo
 | `-y, --yes`                       | Non-interactive mode: auto-approve all actions                                          | `false`                       |
 | `-k, --api-key <key>`             | API key for the LLM provider                                                            | From env var                  |
 | `-p, --provider <provider>`       | API provider (anthropic, openai, openrouter, etc.)                                      | `openrouter`                  |
-| `-m, --model <model>`             | Model to use                                                                            | `anthropic/claude-sonnet-4.5` |
+| `-m, --model <model>`             | Model to use                                                                            | `anthropic/claude-opus-4.5`   |
 | `-M, --mode <mode>`               | Mode to start in (code, architect, ask, debug, etc.)                                    | `code`                        |
 | `-r, --reasoning-effort <effort>` | Reasoning effort level (unspecified, disabled, none, minimal, low, medium, high, xhigh) | `medium`                      |
 | `--ephemeral`                     | Run without persisting state (uses temporary storage)                                   | `false`                       |
@@ -189,7 +189,7 @@ roo acp [options]
 | --------------------------- | -------------------------------------------- | ----------------------------- |
 | `-e, --extension <path>`    | Path to the extension bundle directory       | Auto-detected                 |
 | `-p, --provider <provider>` | API provider (anthropic, openai, openrouter) | `openrouter`                  |
-| `-m, --model <model>`       | Model to use                                 | `anthropic/claude-sonnet-4.5` |
+| `-m, --model <model>`       | Model to use                                 | `anthropic/claude-opus-4.5`   |
 | `-M, --mode <mode>`         | Initial mode (code, architect, ask, debug)   | `code`                        |
 | `-k, --api-key <key>`       | API key for the LLM provider                 | From env var                  |
 
diff --git a/apps/cli/src/acp/agent.ts b/apps/cli/src/acp/agent.ts
index a0154cb340..7557419911 100644
--- a/apps/cli/src/acp/agent.ts
+++ b/apps/cli/src/acp/agent.ts
@@ -14,7 +14,7 @@ import { DEFAULT_FLAGS } from "@/types/constants.js"
 import { AcpSession, type AcpSessionOptions } from "./session.js"
 import { acpLog } from "./logger.js"
 import { ModelService, createModelService } from "./model-service.js"
-import { type ExtendedNewSessionResponse, type AcpModelState, DEFAULT_MODELS } from "./types.js"
+import { type ExtendedNewSessionResponse, type AcpModelState } from "./types.js"
 import { envVarMap } from "@/lib/utils/provider.js"
 
 // =============================================================================
@@ -223,7 +223,7 @@ export class RooCodeAgent implements acp.Agent {
 	 * Get the current model state.
 	 */
 	private async getModelState(): Promise<AcpModelState> {
-		const currentModelId = this.options.model || DEFAULT_MODELS[0]!.modelId
+		const currentModelId = this.options.model || DEFAULT_FLAGS.model
 		return this.modelService.getModelState(currentModelId)
 	}
 
diff --git a/apps/cli/src/acp/types.ts b/apps/cli/src/acp/types.ts
index cc0789726e..a6f03fcdea 100644
--- a/apps/cli/src/acp/types.ts
+++ b/apps/cli/src/acp/types.ts
@@ -55,16 +55,16 @@ export interface ExtendedNewSessionResponse extends acp.NewSessionResponse {
  * These map to Roo Code Cloud model tiers.
  */
 export const DEFAULT_MODELS: AcpModel[] = [
-	{
-		modelId: "anthropic/claude-sonnet-4.5",
-		name: "Claude Sonnet 4.5",
-		description: "Best balance of speed and capability",
-	},
 	{
 		modelId: "anthropic/claude-opus-4.5",
 		name: "Claude Opus 4.5",
 		description: "Most capable for complex work",
 	},
+	{
+		modelId: "anthropic/claude-sonnet-4.5",
+		name: "Claude Sonnet 4.5",
+		description: "Best balance of speed and capability",
+	},
 	{
 		modelId: "anthropic/claude-haiku-4.5",
 		name: "Claude Haiku 4.5",
diff --git a/apps/cli/src/types/constants.ts b/apps/cli/src/types/constants.ts
index f11973bf45..04abb90ad4 100644
--- a/apps/cli/src/types/constants.ts
+++ b/apps/cli/src/types/constants.ts
@@ -3,7 +3,7 @@ import { reasoningEffortsExtended } from "@roo-code/types"
 export const DEFAULT_FLAGS = {
 	mode: "code",
 	reasoningEffort: "medium" as const,
-	model: "anthropic/claude-4.5-sonnet",
+	model: "anthropic/claude-opus-4.5",
 	provider: "openrouter",
 }