Cold-Blooded Perk in Call of Duty: What It Covers and Where It Is Gone

Cold-Blooded is a perk that makes you harder for enemy sensors to single out, with thermal optics and automated killstreaks as the classic targets. It has been in the series since Modern Warfare 2 (2009), usually as a counter to gear that aims for you.

Two current facts matter most. In Modern Warfare 4 it is a Perk 3 option unlocked at player level 36. In Warzone it no longer exists: Raven removed it from the perk list in February 2026, during Black Ops 7 Season 02.

Cold-Blooded in Modern Warfare 4

Activision's pre-launch breakdown (19 October 2026) says it makes you undetectable by:

• AI targeting systems
• thermal optics
• recon drones
• spotter scopes
• snapshot grenades
• High Alert

The last item is the useful one in practice. High Alert (Perk 1, level 8) warns an enemy when they are spotted from outside their view, and Cold-Blooded stops you from triggering that warning. Scanning tools that Ghost handles, such as UAVs and Heartbeat Sensors, are not on the list. Ghost sits in Perk 1 and Cold-Blooded in Perk 3, so a build can carry both.

The other Perk 3 options at launch are Lethal Reach and Combat Grid (level 4), Battle Hardened (12), Scavenger (28) and Tracker (32). Cold-Blooded, at level 36, is the last one to unlock.

What happened in Warzone

Warzone had Cold-Blooded for years, with the in-game text shifting each era. The Black Ops 6 era description covered AI targeting, thermals, tracker marks, tracker footprints and scrambling or EMP effects. The Black Ops 7 era text added Heartbeat Sensors and Phantom Signal, per a community wiki.

Then the 2026 notes cut it:

Update	What Raven's notes say
Season 02 launch, 4 February 2026	Surveyor appears, labelled "Previously Cold-Blooded": a map-awareness perk that briefly shows enemies who use a Buy Station or pick up a contract within 120 metres
Season 02, 6 February	Ground loot perks rotate because Cold-Blooded left the list
Season 02 Reloaded, 20 March	Resurgence's Reactive Armor loses its EMP effect, since the perk that countered EMP is gone

So Surveyor is not a stealth perk any more. It also lets your UAVs have a 20% larger radius and outlines downed enemies through walls within 40 metres. Raven kept it in the Season 05 contract pool and in Season 06 Legendary Supply Boxes.

Warzone integrates Modern Warfare 4 content from 6 November 2026. The Warzone Season 1 perk list had not been published when this page was checked, so nobody can say yet whether the MW4 version of Cold-Blooded arrives.

Across the series

Game	Slot	Unlock
Modern Warfare 2 (2009)	Tier 2	Level 25
Vanguard	Tier 1	Level 46
Modern Warfare II	Bonus perk	Level 28
Modern Warfare III	Gear item "Hijacked IFF Strobe"	Armory Unlocks
Black Ops 6	Tier 3	Level 41
Black Ops 7	Tier 3	Level 17
Modern Warfare 4	Perk 3	Level 36

Modern Warfare III is the odd one out: there, the effect was a gear piece rather than a perk, and it was earned through the Armory Unlock system.

Cold-Blooded versus Ghost

	Cold-Blooded (MW4)	Ghost (MW4)
Hides you from	AI targeting, thermals, recon drones, spotter scopes, snapshot grenades	Callouts, UAVs, Portable Radars, Heartbeat Sensors
Perk slot	3	1
Unlock level	36	24
Works against	Targeting systems and optics	Scanning tools

See Ghost for the other half of the pair.

Using it well

• Pick it when the lobby uses scorestreak drones or thermal scopes. With neither, Perk 3 slots such as Scavenger or Combat Grid give more.
• Do not expect it to stop a human from seeing you. It only affects tools.
• In Warzone, skip old loadout guides that list it. The perk list changes every season, and Cold-Blooded has not been on it since February.

Related terms

• Ghost: the UAV and radar counterpart.
• Perks glossary: both stealth perks in short.
• Advanced UAV: a streak that Ghost, not Cold-Blooded, answers.
• Call of Duty wiki: all terms.

FAQ

Is Cold-Blooded in Warzone?

No. Raven took it out of the perk list in Season 02 of Black Ops 7, in February 2026, and added Surveyor, which does something different.

Is Cold-Blooded in Modern Warfare 4?

Yes. It is a Perk 3 option, unlocked at level 36.

Does Cold-Blooded stop heartbeat sensors?

In Modern Warfare 4 the official description does not list Heartbeat Sensors, which Ghost covers instead. Earlier Warzone versions did include them.

What does Cold-Blooded do against thermal scopes?

It stops you from showing up as a heat signature. Modern Warfare 4 lists thermal optics explicitly.