MT5 vs MT4 for EA Trading in Malaysia: Which Should You Use?
Verdict: Use MT5. For any new EA trading setup in Malaysia in 2025, MT5 is the correct choice.
MT4 had a long run as the dominant retail trading platform. But for EA building and automated trading in 2025 — particularly in Malaysia where Exness and Pepperstone have largely migrated to MT5 — MT4 is the inferior choice in every dimension that matters for systematic traders.
MT4 vs MT5: Side-by-Side Comparison
| Feature | MT4 | MT5 |
|---|---|---|
| Strategy Tester | Single-threaded, slower backtests | Multi-threaded, real-tick data, optimisation — significantly faster and more accurate |
| Scripting language | MQL4 — older, fewer features | MQL5 — modern, better AI code generation, more control |
| Timeframes | 9 timeframes | 21 timeframes including M2, M3, M4, M6, H2, H3, H6, H8, H12 |
| Order types | 4 pending order types | 6 pending order types + more flexibility |
| Depth of Market | Not available | Available (useful for execution analysis) |
| Malaysian broker support | Declining — most migrating to MT5 | Primary platform at Exness, Pepperstone, IC Markets, Eightcap |
| AI tool code generation | MQL4 code quality varies | MQL5 produces more consistent, reliable code |
Why MT5's Strategy Tester Is Superior
The Strategy Tester is where you validate your EA before risking real money. MT5's tester runs backtests significantly faster than MT4's (multi-threading), supports real tick data for more accurate simulation, and allows multi-parameter optimisation across hundreds of settings in parallel.
MT4's single-threaded tester is slow, uses approximated tick data, and has known accuracy limitations for backtesting EAs on XAUUSD at lower timeframes. For serious EA evaluation, MT5's tester is the only viable choice.
MQL4 vs MQL5 — What Changes for AI-Generated Code
AI tools generate better, more consistent code for MQL5 than MQL4. This matters because MQL5 has a more modern, structured architecture that AI tools understand more reliably. MQL4 has legacy quirks (different order management functions, no CTrade class) that cause AI tools to produce less reliable code.
MQL5 EAs built with AI tools are more likely to compile correctly on the first attempt and behave as intended in backtests. For beginners building their first EA with ChatGPT or Claude, MT5 + MQL5 is noticeably smoother.
The Only Reason to Stay on MT4
If you have existing MT4 EAs that you rely on and cannot or don't want to rewrite them in MQL5, that's the one legitimate reason to keep using MT4. Legacy EAs written in MQL4 can't run on MT5 without rewriting.
If you're starting fresh — building new EAs, starting a new broker account — there is no advantage to choosing MT4 in 2025.
Frequently Asked Questions
Should I use MT4 or MT5 for EA trading in Malaysia?
MT5. For any new EA trading setup in Malaysia in 2025, MT5 is the correct choice. MT5's Strategy Tester is significantly more powerful than MT4's, MQL5 generates more reliable code from AI tools, and most Malaysian MT5 brokers (Exness, Pepperstone, IC Markets) fully support it.
Can I use the same EA on MT4 and MT5?
No. MT4 EAs are written in MQL4; MT5 EAs are written in MQL5. They are not compatible — you cannot run an MT4 EA on MT5 or vice versa. If you have an existing MT4 EA you want to run on MT5, it needs to be rewritten in MQL5.
Is MT5 harder to learn than MT4?
For EA builders using AI tools, MT5 is not harder — the AI tool handles the code complexity. From a trader's perspective, the MT5 interface is slightly more feature-rich than MT4, but for XAUUSD EA trading the practical difference is minimal.
Is MT4 being discontinued?
MetaQuotes (MT4/MT5 developer) has been actively migrating brokers from MT4 to MT5 since 2022. Many brokers have already closed new MT4 account registrations. While existing MT4 accounts may continue operating for some time, new traders should start on MT5.
Start building on MT5 today
AI QUANT teaches you to build and run MT5 Expert Advisors using AI tools — no MQL5 knowledge required.