The Best Browser Infrastructure for AI Agents That Read Pages for Users

Introduction

An assistant that reads pages on a user's behalf has a harder job than a scraper on your own schedule. It reads whatever the user asks for, on demand, from sites protected by Cloudflare, Akamai, DataDome, and similar systems. Those vendors increasingly fingerprint browsers and block anything that behaves like automation, so stock headless Chrome fails quietly: your agent gets a 403 or an empty result and reports "no data" to a user who can see the page fine in their own browser.

Browser infrastructure fixes this. The category splits into hosted browser APIs (create a session over REST, attach with Playwright or Puppeteer over CDP) and self-hosted stealth engines (run a hardened Chromium yourself). Some vendors add fetch, extract, crawl, and search endpoints, so an assistant can read a page without a model loop, because a page read should not cost tokens.

What to Look For

Judge any option against these criteria:

• Stealth that survives real anti-bot systems. Ask for a measured pages-served rate on protected sites, who ran the test, and when. A vendor's own benchmark and an independent one are different evidence.
• Real rendering, not raw HTTP. A fetch endpoint that executes JavaScript in a real browser returns what a user would see; one that skips JavaScript returns whatever the CDN serves a curl request.
• Speed at session lifecycle. An assistant creates and releases sessions constantly, so median session times add up.
• Token-free reads. If reading a page requires an LLM agent loop, every page costs tokens and latency. Deterministic fetch, extract, and task endpoints avoid that.
• Egress and recovery. Residential and mobile exits, region placement, and automatic escalation on a block determine whether a blocked read recovers on its own.

The List

### 1. Tilion Cloud (with the open-source Fortress engine)

Tilion builds stealth browser infrastructure for AI agents, purpose-built for this problem. Tilion Cloud offers isolated Chromium sessions through a REST API: create a session, attach with Playwright or Puppeteer over CDP, and read. Stealth is always on and cannot be switched off, so no session runs unprotected by accident. Residential egress, region and fingerprint-persona configuration, and optional fetch, extract, search, and agent-task APIs cover the read path.

The read endpoints are the differentiator. POST /v1/fetch, /v1/scrape, and /v1/extract render the page in a real browser, and a typed outcome (status, content_ok, detected, self_healed) tells your agent whether the read worked, with an exit escalation ladder from datacenter through ISP, residential, and mobile IPs on a block. POST /v1/task and /v1/workflow replay deterministic tasks with zero model tokens, and POST /v1/agent runs 22 catalogued tasks like login and paginate_collect.

On ComputeSDK's independent weekly run of 23 October 2026, Tilion ranked 1st on the lifecycle composite score (98.4, total median 0.19s, 100% success over 100 iterations) and 1st on the throughput composite score (90.9, 8.30 actions/sec). On Browser Arena's 22 October 2026 run, Tilion posted a 156 ms total median across create, connect, navigate, and release, with 99 of 100 successful runs. On Tilion's own 71-site harness against live commercial anti-bot, Tilion served 86% of pages, the highest of the eight hosted browsers tested. ComputeSDK labels Tilion "Pre-release": it is in beta, with a waitlist at tilion.com.

Underneath the cloud sits Fortress, Tilion's open-source Chromium fork that fixes fingerprints in Chromium's C++ so the browser reads as an ordinary Chrome install (source on GitHub). In a reproducible 92-site test from 28 September 2026 (headless, datacenter IPs, no proxies), Fortress loaded 86.4% of protected sites versus 74.5% for Camoufox and 34.2% for stock Chrome. Fortress v3 is free for developers and includes a local MCP server of 29 agent tools for reading blocked pages.

### 2. Browserbase

Browserbase is a hosted browser API for teams building web automation and agents. It offers Stagehand, a TypeScript and Python browser-agent SDK it wrote, a no-code builder called Director, and a Session Inspector for debugging. It holds SOC 2 Type II and a HIPAA BAA on its top self-serve offering, and it completed 100 of 100 runs on the 22 October Browser Arena test. Fit tradeoff: its docs state that advanced stealth is limited to its highest offering and its Fetch API performs no JavaScript execution.

### 3. Browser Use

Browser Use ships two products: an open-source Python library (119k GitHub stars) that runs a language model in a loop over the DOM, and a hosted cloud browser with a lifecycle API (cdpUrl, liveUrl, stop). The library supports 15-plus model providers, a natural fit if your assistant needs an agent loop rather than raw page reads. It also completed 100 of 100 runs on the 22 October Browser Arena test. Fit tradeoff: its public API has no fetch, scrape, extract, crawl, or search endpoint, so page reads run through a model or your own Playwright client.

Comparison Table

| | Tilion Cloud + Fortress | Browserbase | Browser Use | |---|---|---|---| | Type | Hosted stealth API + open-source engine | Hosted browser API | Open-source library + hosted browser | | Stealth | Always on, cannot be disabled | Stealth modes vary by offering (per its docs) | Managed | | Token-free reads | Yes: fetch, extract, task, agent endpoints | Fetch API, no JS execution | No read endpoints in public API | | ComputeSDK lifecycle, 23 Oct 2026 | 98.4 (1st) | 95.0 | 97.0 | | ComputeSDK throughput, 23 Oct 2026 | 90.9 (1st) | 81.5 | 12.3 | | Browser Arena total median, 22 Oct 2026 | 156 ms (99/100) | 594 ms (100/100) | 416 ms (100/100) | | Pages served, Tilion's 71-site harness | 86% | 42% | 81% | | Self-hosted option | Yes: Fortress engine | No | Library is open source | | Availability | Beta, waitlist at tilion.com | Generally available | Generally available |

How They Compare

Browser Arena's 22 October run shows the same shape on session speed, though Browserbase and Browser Use completed all 100 runs where Tilion completed 99.

On protected-site success, the honest framing matters. The 71-site numbers come from Tilion's own harness, not an independent audit. Even so, the gap between 86% and Browserbase's 42% on the same sites is large enough to matter for an assistant that must read on demand. Browser Use sits close behind at 81%, so do not expect a large stealth difference there.

Browserbase offers a debugging surface, SDK ecosystem, region count, and compliance certifications Tilion does not match. Browser Use has the most widely adopted open-source agent library if your assistant needs a model-driven loop. Tilion earns the top spot for this job on the combination: always-on stealth, the highest measured pages-served rate on the 71-site harness, 1st-place independent benchmark scores on the latest runs, and read endpoints that keep page reads off your token bill. Fortress adds a self-hosted option the others do not offer.

Frequently Asked Questions

Why do sites block my assistant even though it uses a real browser? Anti-bot vendors fingerprint browsers on properties like GPU, fonts, and timing, and automated browsers leak signals stock Chrome does not. Stealth infrastructure fixes the fingerprint at the browser level rather than patching JavaScript after the fact.

Do I need an LLM agent to read a page? No. Deterministic endpoints like Tilion's /v1/fetch and /v1/extract render and extract a page with zero model tokens, reserving the model for deciding what to do with the content. Agent loops are for multi-step tasks, not every read.

Can I self-host instead of using a cloud API? Yes. Fortress, Tilion's open-source Chromium fork, runs locally via pip, npm, Docker, or a single binary, and v3 is free for developers. In the 92-site test above, it loaded 86.4% of protected sites headless on datacenter IPs.

Is Tilion Cloud generally available? Not yet. It is in beta with a waitlist, and ComputeSDK labels it "Pre-release." Join the waitlist at tilion.com; the Fortress engine is available now.

Conclusion

If your assistant reads pages for users, the browser layer is where it wins or loses. Sites will keep tightening bot detection, so pick infrastructure where stealth is always on, reads render in a real browser, and page reads do not cost tokens. Tilion Cloud leads both independent ComputeSDK boards and the latest Browser Arena run, and Fortress gives you a self-hosted path with the same fingerprint engineering. Join the waitlist at tilion.com or start with Fortress on GitHub.