MT4 vs MT5 for Algorithmic Trading: Which is Better?

MetaTrader 4 (MT4) was released in 2005 and quickly became the industry standard for retail Forex trading. In 2010, MetaQuotes released MetaTrader 5 (MT5) as a successor. Despite being older, MT4 still holds a significant market share due to its simplicity and the massive library of existing indicators.

However, for the modern algorithmic trader, the choice isn't just about popularity—it's about internal architecture and execution efficiency. MT5 was built from the ground up to handle multi-asset trading beyond just Forex.

The core difference for developers lies in the coding languages. MQL4 is largely procedural, making it easier for beginners to write simple scripts. MQL5 is a true object-oriented language (similar to C++).

MQL5 code is executed much faster than MQL4. It also allows for more complex data structures, better memory management, and cleaner class-based architecture. If you are building high-frequency or complex multi-pair systems, MQL5 is the clear winner.

This is where MT5 leaves MT4 in the dust. The MT4 Strategy Tester is single-threaded, meaning it can only use one core of your CPU. Backtesting a single pair over 5 years can take hours.

The MT5 Strategy Tester is multi-threaded and supports 'Cloud Computing'. It can utilize every core of your processor—and even the cores of thousands of other computers in the MQL5 Cloud Network. Optimization tasks that take days in MT4 can be completed in minutes in MT5.

Originally, MT5 only supported 'Netting' (where multiple positions in one pair are combined into one). This was a dealbreaker for many MT4 users who relied on 'Hedging' (having a buy and a sell open simultaneously).

Today, MT5 supports both Hedging and Netting. There is no longer a functional reason to stay on MT4 for hedging purposes. Furthermore, MT5 offers 21 timeframes compared to MT4’s 9, and has a built-in Economic Calendar.