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MetaTrader 5 shipped in 2010, which makes it older than a good number of the traders using it. Yet every time a broker announces a migration, the forums fill with the same question: can I just stay on MT4?
Often you can. But MT5 is not a re-skin of its predecessor, and treating it like one is how traders end up with rejected orders, backtests that flatter them, and positions that behave nothing like they did on the old platform. The market it plugs into is vast, roughly $7.5 trillion turning over daily, most of it traded away from any exchange, which is part of how the $7.5 trillion-a-day forex market actually works.
Here is what genuinely changes, what improves, and what to fix in your first hour.
MetaQuotes built MetaTrader 5 as a multi-asset platform from the ground up. MT4 was written around spot forex with CFDs bolted on later. MT5 was written to route orders to exchanges as well as over the counter, so it carries a different order engine, a different programming language and a different account structure underneath.
Three consequences matter day to day: what you can trade, how your positions are recorded, and what the Strategy Tester can do.
You get forex pairs, CFDs on indices, single stocks and commodities, plus futures on real exchanges where the broker connects to one. That matters if you want to hold a DAX position and a EURUSD position in the same account and see them side by side. It also means margin calculations get messier, because futures contracts expire and index CFDs often don't.
MT4 gives you nine. MT5 gives you twenty-one, including 2-minute, 3-minute, 12-hour and a monthly view. The 12-hour chart is quietly useful for swing traders who find daily too coarse and 4-hour too noisy. There are also 38 built-in indicators and 44 drawing tools, with thousands more in the MQL5 community library.
This is the single biggest source of confusion, and it has nothing to do with charts.
An MT5 netting account holds one position per symbol. Buy 0.5 lots of EURUSD, then buy another 0.3, and you hold 0.8 lots at an averaged entry price. Buy 0.5 and then sell 0.3, and you simply hold 0.2 lots. The broker's server aggregates everything.
An MT5 hedging account works like MT4. You can hold 1 lot long and 1 lot short on the same pair simultaneously, each with its own ticket, stop and target.
Why care? Because grid, martingale and most recovery-style expert advisors assume hedging. Run one on a netting account and it will close your long when it opens the short, which is rarely what the code intended. Ask your broker which mode the account uses before you deposit, and check whether they let you choose.
MT4's tester is single-threaded and tests one symbol at a time. MT5's is multi-threaded, can test a portfolio of symbols simultaneously, and uses real tick data where the broker has supplied it.
What that looks like in practice: an optimisation run that takes eight hours on MT4 might finish in forty minutes on MT5 using local agents across your CPU cores. You can let the genetic algorithm chew through years of data on a basket of pairs and compare correlation rather than guessing at it.
Two cautions. First, that "99% modelling quality" figure only means something if the tick history behind it is genuine; most brokers only provide reliable tick data going back a few years, so a decade-long backtest is usually interpolated. Second, run your final validation with real ticks and a realistic spread. It is slow, and it is the only run worth trusting.
MT5 adds Buy Stop Limit and Sell Stop Limit orders, giving you six pending order types against MT4's four. Useful if you want to enter on a breakout but cap your entry price.
Less welcome is filling mode. MT5 servers specify whether they accept Fill or Kill, Immediate or Cancel or Return, and if your order request specifies the wrong one you get an error rather than a trade. If you see "unsupported filling mode" on a perfectly ordinary market order, that is why.
Symbol names also drift. A broker might quote EURUSD.a or EURUSD.m, and an EA with a hardcoded symbol string will sit there doing nothing. Always use the Symbol() function rather than typing the pair name.
Honesty time. MT4 has a bigger ecosystem: more brokers offer it, more EAs are written for it, and more tutorials assume it. MQL5 looks like C++ and behaves like it, so porting an MQL4 indicator is a rewrite, not a copy-paste.
The platform also assumes you know what you are doing in ways MT4 never did. One-click trading is off by default, the Market and Signals tabs take up screen space, and the tester requires you to download history before it will run anything. None of it is hard, but it is friction. There is a longer breakdown of where MetaTrader 5 still frays if you want the grim details before committing.
Broadly:
MT4 is still everywhere for good reasons that have little to do with quality, as the story of why a 2005 platform still runs so much retail forex makes clear. And whichever you pick, the platform is the cheap part. Spreads, commission, swap and slippage decide whether you make money, which is why what you're actually paying for with a forex broker deserves more of your attention than the chart colours.
Work through these before you place a live trade.
Do those six things and MT5 stops feeling like an unfamiliar platform and starts feeling like a tool. Skip them and you will spend a fortnight assuming the software is broken when it is simply configured for someone else.
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