Production date: 2022-2023

The T-600 series consists of two categories of early infiltrator hunter-killers (a heavy infantry role and an intelligence role) . It is one of the first hunter killers to feature a truly humanoid endoskeleton, which is optionally sheathed in rubber latex skin and combat fatigues to allow the units to approach human encampments. The T-600 is equipped with the first iteration of the Neural Net CPU (rudimentary in the case of the T-600 and advanced in the case of the T-680). This enabled more precise combat maneuvers, stealth, and greater tactical coordination. Both models were introduced at the same time, but the resistance was not aware of the existence of the T-680 for some time (less than a few thousand were ever produced).

The T-600s serve as shock troopers, while the T-680s serve a logistics and reconnaissance role. The ratio of T-600 production compared to T-680 production was roughly 2000 to 1.  While aggressive and methodical, the T-600s are essentially incapable of true independent thought. On the other hand, the T-680s require the ability to analyze battlefield conditions for their role (just as a human observer would). The T-680s are consequently vastly more intelligent, being able to learn from previous experiences and develop and refine conceptual strategic models with predictive reliability to kill the largest number of human resistance fighters. In their reconnaissance role, T-680s were also required to be more effective infiltrators as they actually need to enter human encampments to assess points of strategic vulnerability.

Note: Humanoid 600 Series units that resemble T-800s in terms of behavior and appearance (with the exception of the spurious rubber disguise) are invariably the rarer T-680 models. These are the infiltrators that Kyle Reese referred to. The larger, more aggressive units encountered on the battlefield are invariably stock T-600s. In common parlance both units are referred to as "600 Series".
T-600 (Heavy Infantry)

T-680 (Recon)


: Heavy Infantry, Shock Troopers
Note: The original production run of the T-600 was in the tens of thousands. As they became obsolete they were replaced by the T-700s & T-800s on the battlefield. The purpose of the T-600 is to allow models with advanced IA (flying scouts, T-680 recon units, etc) to detect vulnerable areas of enemy formations, then act on that information and attack those vulnerable areas. If the intelligence is good, T-600s can surround a fortificuation from all sides and block off "hidden" escape routes, eliminating all enemies.

This requires T-600s to follow very precise instructions, read geographical topology accurately, avoid traps related to them by scouts, and to coordinate with each other with minimal communication. Earlier Terminator models were not capable of doing this. The T-600s marked the beginning of a deadlier era of the war.

INTELLIGENCE- Series 600-A Neural Net CPU. This CPU is set to a "read only" mode which means that new data and programming cannot be written to the non-volatile memory area of the brain. This area of the brain contains a pre-programmed knowledge base of mission directives, behaviors, and combat tactics. The artificial intelligence software of the T-600 is more advanced than previous models.

However, new data can be entered into volatile memory allowing for units to "learn" basic information, run battlefield calculations and ballistic trajectories, keep track of enemy forces, and calculate casualties. Over time the information "learned" is erased by new information making the unit incapable of observational learning, strategy, or analysis.
Even so, T-600 is much more advanced and well coordinated than its predecessor and is capable of fighting in sophisticated military formations in which each unit must cooperate with the group.

Though based on the same principles as the later Neural Net CPU found in the T-800, the 600-A series CPU is highly scaled down for mass production. It has less volatile memory for learning, less detailed combat files in nonvolatile memory, runs at a fraction of the speed of its successor, and due to larger size is more easily damaged by physical shock or electromagnetic radiation.

These units are capable of speech and basic communication. They are more dangerous when coordinated by Centurions.

3 modes of operation:
  • direct (directed by Skynet defense computers like soldiers in a war game);
  • automatic (individual units acting automatically to a variety of preprogrammed conditions); and
  • autonomous (single units relinquished to their own control acting independently).
CONCEALMENT - Optional rubber skin and combat fatigues. Can only pass as a human from a distance. Can be detected by animals from great distance. Combat fatigues cover the body, while the rubber is used to cover only the head and hands of the unit. A serious problem with the latex rubber disguise is that it is often chewed apart by rodents and buzzards while the units are in standby mode. The rubber also bleaches in sunlight and becomes discolored under certain environmental conditions. The synthetic fabric of the combat fatigues is of very low quality and disintegrates with prolonged exposure to sunlight.

CAPABILITIES- In addition to the above listed capabilities the 600 Series has many features. Capable of pressing roughly 2 tons, traveling on all terrain with little difficulty, and operating human weaponry.  New units are said to be able to run as fast as 22 mph (30 mph for short bursts), but due to rust and detritus building up in the hydraulics of the leg assemblies they are actually very slow moving compared to humans. T-600s have limited self maintenance (or self-preservation) programming and suffer from breakdowns.

CONSTRUCTION- Over 7 feet tall. Titanium alloy construction (not hyper-alloy found in later models). Thick housing and armor. Resistant to small arms fire (but not heavy conventional weaponry), with more limited resistance to plasma weaponry. Susceptible to rust and corrosion.

WEAPONRY- The T-600 is issued with a Skynet derivative of the M-134 mini gun (s).

  • Susceptible to rust, making the units slow and ponderous.
  • Incapable of independent thought.
  • Vulnerable spots, such as an area on the back of the neck allowing for the unit to be disabled by a simple blunt instrument.
  • Rubber skin is susceptible to being bleached in sunlight, tearing at points of articulation (in the hands), and green discoloration when exposed to water containing algae.
  • The combat fatigues are so susceptible to disintegrating under UV exposure that T-600s are seldom encountered with the fatigues intact.
  • Can be detected by animals at great distance.
  • Minimal self-preservation programming.

THREAT LEVEL- Moderate in small numbers, High in large numbers


: Reconnaissance, Logistics, Prison Administration
Note: T-680s were manufactured in smaller numbers than T-600s.

INTELLIGENCE- The T-680s utilize the revolutionary Series 600-B, the first fully functioning Neural Net CPU. This CPU is set to "write" mode which means that new data and programming can be written to the non-volatile memory area of the brain by the Terminator itself. This area of the brain contains  the same pre-programmed knowledge base of mission directives, behaviors, and combat tactics found in the T-600, but with far greater storage capacity to enable the unit to build upon the existing knowledge base and learn from experience. Note that Sky-Net artificially disabled this feature in later models to prevent self awareness.

New data can be entered into volatile memory allowing for units to "learn" information, run battlefield calculations and ballistic trajectories, keep track of enemy forces, and calculate casualties. Over time the information "learned" is moved to non-volatile memory enabling the unit the capacity for advanced observational learning, inductive reasoning, and meaningful strategic analysis.

The Series 600-B Neural Net CPU is the prototype of the 800 Series CPU and features essentially the same capacity for storage and computation. However, it is built on a larger fabrication process therefore more susceptible to damage from physical shock or electromagnetic radiation. Under some circumstances it can also overheat and burn out. As with any piece of new and untested technology, there are bugs.

However, any programming software that can run on the later T-800, can also run on the T-680. The T-680s never became obsolete as their T-600 siblings. They were simply relegated to a strictly logistic and administrative role once the T-800s were able to take over their infiltration role.

These models are capable of advanced communication, allowing for them to coordinate battlefield activities when Centurions are not available.

Note: Both the 600A and 600 B series CPU are made on a fabrication process over twice as large as the 800 series CPU. For the 600 A series CPU, this is not a problem as it runs at less than a tenth of the processing power and utilizes a fraction of the storage of the 800 series CPU (therefore it doesn't generate excessive heat). However, the 600-B series CPU (a direct architectural forerunner of the 800 Series CPU) has roughly the same capabilities as the 800 series CPU, but is made on an older manufacturing process. Consequently, the 600-B draws more heat and power to operate, requiring an active cooling solution (including radiator coils) in the cranium which is prone to breaking down.

COMBAT-These units are only used in the autonomous mode of operation with "write mode" enabled on their CPU. The role of the T-680 is to discern weaknesses in enemy blockades, ways to exploit local geography, identify the chain of command, assess strengths and weaknesses of resistance groups, and find patterns of weakness in enemy methods. They also use their intelligence to experiment with psychological warfare as a means of routing resistance squads during combat and crippling morale. When the T-680 was introduced it was the worst thing the human resistance had ever encountered, apart from Skynet itself.

CONCEALMENT- Titanium alloy endoskeleton concealed by optional latex skin with foam padding to mimic real human musculature. This covers the entire body of the T-680, not just the head. Unlike with the T-600, the T-680 actually looks fairly convincing. However, the material used is essentially the same and is prone to bleaching in sunlight and discoloration when exposed to various conditions. T-680s maintain both their endoskeleton bodies and rubber disguises better than their larger counterparts, therefore they are not as susceptible to rust or mechanical breakdown. When in standby mode, the latex skin is often damaged by rodents.

CONSTRUCTION- Variable height and build (range from 5' to 6'). May appear male or female. Titanium alloy construction (not hyper-alloy found in later models). Adequate housing and armor to resist small arms fire, with more limited resistance to plasma weaponry. T-680s in vital military roles are issued with body armor to protect vulnerable areas.

CAPABILITIES- in addition to the above listed capabilities the 680 Series has many features. Capable of pressing roughly 1 ton, traveling on all terrain with little difficulty, and operating human weaponry and machinery.  New units are said to be able to run as fast as 37 mph (50 mph for short bursts), but running at high speed warps the hydraulics of the leg assemblies. Due to their ability to learn, T-680s are capable of performing advanced repairs on their bodies, replacing their disguises, and even upgrading themselves. The T-680 is equipped with a superior sensory suite including night vision and telescopic vision.

The real threat of the T-680 is not its physicality (although it is a capable killer in its own right). The threat of the T-680 lies in its ability to infiltrate the outskirts of resistance camps, discern weaknesses in their blockades, identify their chain of command, and then relay this information to the shock troopers (T-600s) who are then able to easily penetrate resistance defenses and terminate key officers. T-680s also watched battles between the resistance and the HK units to determine patterns in their assaults. For years after the introduction of the T-600, the resistance did not even know about the existence of the more sophisticated reconnaissance models, the T-680s. T-680s simply wandered into the outskirts of settlements, listening, and observing; like ghosts.

WEAPONRY- The T-680 is issued with Westinghouse ME-24 Plasma Phase rifle, but can operate any manner of weaponry it encounters.


  • The same advanced intelligence (sentience) that allows for T-680s to be effective military strategists can also lead them to defect from Skynet as self interest becomes increasingly paramount in their programming with experience.
  • Latex skin is often damaged by rodents while the T-680 is recharging in standby mode. It also has a tendency to tear at points of articulation.
  • CPU is susceptible to EMP attack, heat damage, and physical trauma.
  • Can be detected by animals. However, creative T-680s have sometimes found ways to conceal their scent.
  • Less durable than later models or even the larger T-600s (with an additional weak spot on the sternum).
Note: Highly intelligent, the T-680 can perform advanced repairs or even upgrade itself. Though the Series 600-B Neural Net CPU is not directly compatible with either the T-700 or T-800, with considerable work the T-700 chassis can be modified to support a T-680 head assembly. These modifications are not feasible on the T-800 chassis as the hyper-alloy is too durable to be cut by conventional means. Beyond that, the T-800 and T-700 components are universal. Once a T-680 has been upgraded to a T-700 body, the majority of the armor and limbs can be replaced with that of the T-800, with only T-700 torso chassis assembly and T-680 head assembly remaining from the original unit.