BROWSER USE

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- [Browser Harness](https://browser-harness.com)
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- [Web Agents](https://browser-use.com/web-agents)
- [Custom Models](https://browser-use.com/custom-models)
- [Proxies](https://browser-use.com/proxies)

[Pricing](https://browser-use.com/pricing)
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[Cloud Docs](https://docs.cloud.browser-use.com)
[Open Source Docs](https://docs.browser-use.com)

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# Browser Harness API, New Models & Lower Top-Up Minimum

**Date:** 2026-07-17
> The Browser Harness agent API is now public, plus new models across the platform and a lower pay-as-you-go minimum.

---

## Browser Harness API

The Browser Harness (v4) agent API is now part of our public API surface — listed in the OpenAPI spec, docs, and SDK codegen.

- Run and session `status` fields are now typed enums instead of raw strings.
- `GET /runs`, `GET /sessions`, and the run event log now use cursor-based pagination instead of offset paging.
- Follow-up messages are now queued per session at `/sessions/{id}/queue`, with an `interrupt` flag to cancel the active run and apply a message immediately.
- `GET /runs/{id}/messages` is now `GET /runs/{id}/events`.
- Per-run spend caps are now configurable instead of a fixed $5 default:

```bash
curl https://api.browser-use.com/api/v4/runs \
  -H "X-Browser-Use-API-Key: $BROWSER_USE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"task": "...", "maxCostUsd": 25}'
```

## New Models

- **Grok 4.5** (xAI) replaces GLM 5.2 in the Browser Harness model picker.
- **Kimi K3** (Moonshot) is now available in Browser Harness.
- **Claude Fable 5** is available via the API on Browser Harness.
- **GLM** and **MiniMax** are now available natively on Computer Use and Browser Use.

## Pricing

Pay-as-you-go minimum top-up lowered from **$25 to $5**, so it's easier to try Browser Use Cloud without committing to a larger purchase.

## Fixes

- Cancelled runs could briefly flip back to "completed" after the cancellation landed — run status is now sticky once it reaches a terminal state.
- Runs cut off by the output limit were sometimes reported as producing no response, or incorrectly marked successful — they're now reported as truncated.
- Automated (API and scheduled) runs on V3 now wait for CAPTCHA auto-solve instead of giving up early.