Reliable
Every step is checked before the next
Independent Judges read the screen and confirm a step worked before Sai moves on. That is how Sai reached 79.38% on OSWorld 2.1, the highest partial score on the official leaderboard.
Compare
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Sai API vs Hyperbrowser
Hyperbrowser is cloud browser infrastructure with hosted browser agents and scrape and crawl APIs, built for web automation at scale. The Sai API is a computer-use agent on a full computer, so a task can cross websites and desktop apps. Send a task in plain English and get the result back.
- Highest partial score on OSWorld 2.1
- 79.38%
- per task, the only cost published on the leaderboard
- $14.34
- to add Sai to Claude Code, Codex or Cursor
- 1 command
Sai API vs Hyperbrowser, side by side
As of October 2026
| Capability | Sai API | Hyperbrowser |
|---|---|---|
| What you get | ||
| Product | A working computer-use agent (Sai) behind one API | Cloud browser infrastructure plus hosted browser agents and scrape/crawl APIs |
| Computer included | Hosted Windows or Linux cloud computer, or your own Mac or Windows with the Sai desktop app | Yes, hosted cloud Chrome sessions (sandboxes are CLI-only Ubuntu) |
| Operating systems | Windows or Linux in the cloud; macOS and Windows on your own machine | Browser only (Chromium); sandboxes Ubuntu 24.04 without a desktop |
| Native desktop apps | Yes: desktop apps on Windows, Linux and macOS, not just a browser | No |
| Agent loop and action execution | Built in: send a task in plain English, get the result | Yes, hosted agents: HyperAgent, Browser Use, Claude CU, OpenAI CUA, Gemini and more (in a browser) |
| Setup / time to first task | Create an API key, add one MCP command (about a minute) | Low: API key, then SDK/REST call or npx hyperbrowser-mcp |
| Reliability and cost | ||
| Benchmark | Highest partial score on the official OSWorld 2.1 leaderboard: 79.38% (Sai w/ Claude Opus 5, 500 steps, Oct 2026). Binary success 41.67%, #2 behind Claude Opus 5 (44.33%). Trajectories public on Hugging Face | No published score found |
| Step verification | Independent Judges check the screen before each next step | Not documented |
| Pricing | Credits per request. Free plan: one shared Windows cloud computer with daily limits. Paid: dedicated computers and top-ups. | Credits (1 credit = $0.001). Plans: Free, Startup $30/mo, Scale $100/mo, Enterprise |
| Cost per task / cost drivers | $14.34 per OSWorld 2.1 task, the only leaderboard entry with a published cost (OSWorld 2.0: $15.70) | Browser $0.10/hr; proxy $10/GB; HyperAgent $0.02/step; scrape $0.001/page |
| Repeat runs | Learns a workflow once, then replays it as self-healing code: up to 90% fewer tokens on repetitive tasks | HyperAgent action cache replays steps without model calls (falls back when pages change) |
| Control and safety | ||
| Human approval | Built in: approve, approve for this task, or deny; link-only approvals for sign-ins and credentials | Interactive live view lets a human step in; no approval step in agent APIs |
| Live view / takeover | Live view to watch tasks and answer approvals. No manual takeover | Live URL (interactive by default, embeddable) plus rrweb replay and optional MP4 |
| Data and compliance | SOC 2 Type II and HIPAA. Runs on Simular's cloud computer or your own machine. | 5 regions (US, EU, Asia on Enterprise); SOC 2 / HIPAA only from a third-party source |
| Operations | ||
| Sessions and persistence | Context carries across tasks on a computer; reset with new-session. | Configurable timeout (maximum not documented); profiles persist cookies and storage |
| Concurrency and limits | One task per computer at a time; 60 messages per hour; paid plans add dedicated computers | Free 1 / Startup 25 / Scale 100 / Enterprise 1,000+ (third party); blog claims 10,000+ |
| Fit in your stack | ||
| Coding agents / MCP | Official MCP server (@simular-ai/sai-mcp) for Claude Code, Codex, Cursor and any stdio MCP client | Yes: hyperbrowser-mcp for Cursor, Windsurf, Claude Desktop |
| Model choice | Model-agnostic: Anthropic, OpenAI, Google, MiniMax, xAI, OpenRouter, or auto | Broad: Claude, OpenAI, Gemini, Grok and more; BYO keys |
| SDKs / languages | HTTP API (curl, Python, Node examples) plus the MCP server on npm | Node and Python SDKs, REST, Playwright/Puppeteer/Selenium |
| Free tier | Yes: free plan includes a shared Windows cloud computer (daily limits) | Yes: forever-free plan, 1 concurrent browser (credit amount conflicts across sources) |
What unifies the Sai API
Four things every task gets, without extra code.
Efficient
Learn once, repeat for less
The first run works the task out. After that, Sai replays it as self-healing code instead of reasoning through every screen, using up to 90% fewer tokens on repetitive tasks.
Ready
A whole computer, already running
Sai works on a hosted Windows or Linux cloud computer, or on your own Mac or Windows machine. It opens apps, clicks and types in desktop software that has no API. No VMs or display drivers to manage.
Composable
Plugs into the agents you already use
Add Sai to Claude Code, Codex or Cursor with one MCP command, or call one HTTP endpoint from any language. It pauses for your approval before sign-ins and other sensitive steps.
Frequently asked questions
What is the difference between the Sai API and Hyperbrowser?
Hyperbrowser runs hosted Chrome sessions and lets you choose a browser agent to drive them, including HyperAgent, Browser Use, Claude, OpenAI and Gemini computer use. The Sai API runs Sai on a whole computer, a hosted Windows or Linux cloud computer or your own Mac or Windows machine, so a task can use websites and native desktop apps.
Can Hyperbrowser operate desktop apps?
No. Its sessions are cloud browsers, and its sandboxes are command-line Ubuntu 24.04 machines without a desktop. Sai operates desktop apps on Windows, Linux and macOS as well as websites.
How is Hyperbrowser priced compared with the Sai API?
Hyperbrowser uses credits (1 credit = $0.001) with Free, Startup ($30/mo), Scale ($100/mo) and Enterprise plans. Browsers cost $0.10 per hour, proxies $10 per GB, HyperAgent $0.02 per step and scraping $0.001 per page. The Sai API is billed in credits per request, and on OSWorld 2.1 Sai completed tasks at $14.34 each.
Do repeat runs get cheaper?
On both. HyperAgent’s action cache replays steps without model calls and falls back to the model when a page changes. Sai learns a workflow once and replays it as self-healing code, using up to 90% fewer tokens on repetitive tasks.
Does Hyperbrowser have an MCP server?
Yes, hyperbrowser-mcp works with Cursor, Windsurf and Claude Desktop. Sai has an official MCP server, @simular-ai/sai-mcp, for Claude Code, Codex, Cursor and any stdio MCP client.
How do approvals and live view work?
Hyperbrowser gives each session a live URL that is interactive by default and embeddable, plus rrweb replay and optional MP4; a person can step in, but its agent APIs have no approval step. Sai asks before consequential steps with approve, approve for this task or deny, and sign-ins and credentials are approved through a link.
When is Hyperbrowser the better choice?
For web-scale scraping and automation: cheap parallel browsers, stealth, proxies, CAPTCHA solving, five regions, scrape, crawl and extract APIs, and many hosted agent models. Choose the Sai API when the task needs a full computer with desktop apps, step checks and built-in approvals.
How do I get started with the Sai API?
Sign in at platform.simular.ai and create an API key. Add Sai to Claude Code, Codex or Cursor with one MCP command, or call the HTTP API from any language. The free plan includes a shared Windows cloud computer with daily limits.
Skip the harness. Ship the agent.
Get an API key in a minute, or talk to us about running Sai at scale.