> ## Documentation Index
> Fetch the complete documentation index at: https://browseruse-0aece648-codex-api-v4-agent-docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# FAQ

> Common questions and solutions.

## Which model should I use?

* **Claude Opus 5** (`claude-opus-5`) — maximum intelligence for difficult, long-horizon work.
* **GPT-5.6** (`gpt-5.6`) — fast on complex tasks.
* **Gemini 3.5 Flash** (`gemini-3.5-flash`) — fast for simpler tasks.
* **MiniMax M3** (`minimax-m3`, default) — cheapest for simple and high-volume tasks.

See [Models](/cloud/agent/models) for the complete V4 picker and pricing.

## How do I get the live browser URL?

The V4 run's `browser.ready` event contains `live_view_url`. Embed it in an iframe or open it in a browser.

```python theme={null}
created = await client.runs.create("Go to example.com")
await client.runs.wait_for_completion(created.id)
events = await client.runs.events(created.id, limit=100)
ready = next(event for event in events.events if event.type == "browser.ready")
print(ready.data["live_view_url"])
```

Poll events until `browser.ready` appears if you need the URL while the run is still active. See [Human in the loop](/cloud/agent/human-in-the-loop) for a complete flow.

## Getting blocked by a website

Stealth and proxies are active by default. If you're still getting blocked:

* **Use a profile** with logged-in cookies to bypass login walls.
* **Try a different proxy country** to match the target region.

If it still doesn't work, contact support inside the [Cloud Dashboard](https://cloud.browser-use.com) — send us a link to the page where you're getting blocked.

## Rate limited (429 errors)

The SDK auto-retries 429 responses with exponential backoff. If persistent, you may need more concurrent sessions — contact support.

## v2 vs v3 vs v4 — which should I use?

**Use v4 for new agent integrations.** It is designed for long-horizon work:

* Run-focused API with a cheap status polling endpoint
* Conversation sessions with queued and interrupting follow-ups
* Persistent workspaces and turn-scoped file attachments
* Incremental events for custom UIs and monitoring
* Per-run cost totals, cost caps, and optional judgement

V3 remains available for existing integrations and older features that have not moved to V4, including server-side structured-output schemas and automatic script caching. V2 is the legacy API closest to the open-source browser agent.

```python theme={null}
# v4 (recommended for new agent runs)
from browser_use_sdk.v4 import AsyncBrowserUse

# v3 (existing session-based integrations)
from browser_use_sdk.v3 import AsyncBrowserUse as AsyncBrowserUseV3
```