MT4 vs MT5 for EAs: which terminal should you automate on?
Both run automated strategies, but MT5's multi-threaded tester, more order types and native depth-of-market make it the stronger automation host — while MT4's ubiquity keeps it relevant. A direct comparison.
Both run EAs. They are not the same terminal.
MetaTrader 4 and MetaTrader 5 both run automated strategies, but under the hood they differ in language, tester speed, and order machinery. If you are automating, those differences matter.
| Feature | MT4 | MT5 |
|---|---|---|
| Language | MQL4 | MQL5 (different language — a port, not a copy) |
| Backtest engine | Single-threaded | Multi-threaded + tick data + cloud agents |
| Order types | Market + pending (basic) | Market + 6 pending + depth-of-market |
| Symbols / markets | Forex-centric | Forex, stocks, futures, options |
| Broker support | Ubiquitous — nearly every retail forex broker | Growing, but not universal yet |
| Best for | Running a known MQL4 EA anywhere | Building/testing EAs faster, more market types |
The two real differences for an EA builder
1. Testing speed. MT5's tester is multi-threaded and supports tick data and cloud agents. A one-year test that takes an hour on MT4 can finish much sooner on MT5. Faster testing means you can actually validate parameter choices instead of guessing — which is the difference between a robust EA and a curve-fit one.
2. Order machinery. MT5's extra pending-order types and depth-of-market open strategy space that simply does not exist in MT4. If your idea needs them, MT4 cannot host it.
The catch
Moving from MT4 to MT5 is a port, not a copy — MQL4 and MQL5 are different languages. You rewrite the logic. To remove that friction, EAbase ships the MQL5 source for supported strategies, so you start from a working port rather than a blank file. And the same license key activates both the MT4 and MQL5 builds (subject to your seat allowance), so you can test on MT5 and run on MT4 without buying twice.
Verdict
- Pick MT5 if you are building or seriously testing EAs and your broker supports it. Faster tests, more order types, future-proof.
- Pick MT4 if your broker only offers it or you already run a proven MQL4 EA and do not want to port.
- Run both by using one license across terminals — test on MT5, deploy on MT4 (or vice versa).
See the MQL5-ready lineup in the EA store, and how a guardian behaves on each terminal in the PropGuard guide. Prefer FTMO? See best EA for FTMO in 2026.