diff --git a/Configuration/Eras/python/Era_Run3_2024_FastSim_cff.py b/Configuration/Eras/python/Era_Run3_2024_FastSim_cff.py
new file mode 100644
index 0000000000000..70fb8c7785187
--- /dev/null
+++ b/Configuration/Eras/python/Era_Run3_2024_FastSim_cff.py
@@ -0,0 +1,6 @@
+import FWCore.ParameterSet.Config as cms
+
+from Configuration.Eras.Era_Run3_2024_cff import Run3_2024
+from Configuration.Eras.Modifier_run3_GEM_cff import run3_GEM
+
+Run3_2024_FastSim = Run3_2024.copyAndExclude([run3_GEM])
diff --git a/Configuration/Eras/python/Era_Run3_2025_FastSim_cff.py b/Configuration/Eras/python/Era_Run3_2025_FastSim_cff.py
new file mode 100644
index 0000000000000..ee5fe0e41fdeb
--- /dev/null
+++ b/Configuration/Eras/python/Era_Run3_2025_FastSim_cff.py
@@ -0,0 +1,6 @@
+import FWCore.ParameterSet.Config as cms
+
+from Configuration.Eras.Era_Run3_2025_cff import Run3_2025
+from Configuration.Eras.Modifier_run3_GEM_cff import run3_GEM
+
+Run3_2025_FastSim = Run3_2025.copyAndExclude([run3_GEM])
diff --git a/Configuration/PyReleaseValidation/python/relval_2017.py b/Configuration/PyReleaseValidation/python/relval_2017.py
index b5e5a444e18e1..e378e19a2351d 100644
--- a/Configuration/PyReleaseValidation/python/relval_2017.py
+++ b/Configuration/PyReleaseValidation/python/relval_2017.py
@@ -51,10 +51,11 @@
 #   2024 (TTbar, TTbar PU, TTbar PU premix, TTbar PU prod-like)
 #        (TTbar trackingMkFit)
 #        (Alpaka Pixel Only, Alpaka ECal only)
-#        (TTbar FastSim, TTbar FastSim PU, MinBiasFS for mixing))
+#        (TTbar FastSim, TTbar FastSim PU, MinBiasFS for mixing)
 #        (ZEE)
 #        (Nu Gun)
 #   2025 (TTbar, TTbar PU)
+#        (TTbar FastSim, TTbar FastSim PU, MinBiasFS for mixing)
 
 numWFIB = [10001.0,10002.0,10003.0,10004.0,10005.0,10006.0,10007.0,10008.0,10009.0,10059.0,10071.0,
            10042.0,10024.0,10025.0,10026.0,10023.0,10224.0,10225.0,10424.0,
@@ -104,7 +105,9 @@
            12846.0,
            12861.0,
            # 2025
-           16834.0, 17034.0,]
+           16834.0, 17034.0,
+           18034.0, 18234.0, 18040.303,
+]
 
 for numWF in numWFIB:
     if not numWF in _upgrade_workflows:
diff --git a/Configuration/PyReleaseValidation/python/relval_steps.py b/Configuration/PyReleaseValidation/python/relval_steps.py
index ae2eda4b89bce..cfd880bfa1052 100644
--- a/Configuration/PyReleaseValidation/python/relval_steps.py
+++ b/Configuration/PyReleaseValidation/python/relval_steps.py
@@ -4606,6 +4606,7 @@ def gen2024HiMix(fragment,howMuch):
 defaultDataSets['2024HLTOnDigi'] = defaultDataSets["2024SimOnGen"] = defaultDataSets['2024']
 defaultDataSets["2025HLTOnDigi"] = defaultDataSets["2025SimOnGen"] = defaultDataSets['2025']
 defaultDataSets['2024FS']='CMSSW_13_0_11-130X_mcRun3_2023_realistic_withEarly2023BS_v1_FastSim-v' #To replace with new dataset
+defaultDataSets['2025FS']='CMSSW_13_0_11-130X_mcRun3_2023_realistic_withEarly2023BS_v1_FastSim-v' #To replace with new dataset
 defaultDataSets['Run4D49']='CMSSW_12_0_0_pre4-113X_mcRun4_realistic_v7_2026D49noPU-v'
 defaultDataSets['Run4D76']='CMSSW_12_0_0_pre4-113X_mcRun4_realistic_v7_2026D76noPU-v'
 defaultDataSets['Run4D77']='CMSSW_12_1_0_pre2-113X_mcRun4_realistic_v7_2026D77noPU-v'
diff --git a/Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py b/Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py
index e16e9aedc0fd0..54994ed32f259 100644
--- a/Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py
+++ b/Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py
@@ -50,6 +50,8 @@
     '2025HLTOnDigiPU',
     '2025SimOnGen',
     '2025GenOnly',
+    '2025FS',
+    '2025FSPU',
 ]
 
 upgradeKeys['Run4'] = [
@@ -3234,7 +3236,7 @@ def condition(self, fragment, stepList, key, hasHarvest):
         'Geom' : 'DB:Extended',
         'GT' : 'auto:phase1_2024_realistic',
         'HLTmenu': '@relval2024',
-        'Era' : 'Run3_FastSim',
+        'Era' : 'Run3_2024_FastSim',
         'BeamSpot': 'DBrealistic',
         'ScenToRun' : ['Gen','FastSimRun3','HARVESTFastRun3'],
     },
@@ -3270,7 +3272,14 @@ def condition(self, fragment, stepList, key, hasHarvest):
         'BeamSpot': 'DBrealistic',
         'ScenToRun' : ['Gen','Sim','Digi','RecoNano','HARVESTNano','ALCA'],
     },
-    
+    '2025FS' : {
+        'Geom' : 'DB:Extended',
+        'GT' : 'auto:phase1_2025_realistic',
+        'HLTmenu': '@relval2025',
+        'Era' : 'Run3_2025_FastSim',
+        'BeamSpot': 'DBrealistic',
+        'ScenToRun' : ['Gen','FastSimRun3','HARVESTFastRun3'],
+    },
 }
 
 # standard PU sequences
diff --git a/Configuration/StandardSequences/python/Eras.py b/Configuration/StandardSequences/python/Eras.py
index 864ab6739d788..dc4ed59f246e7 100644
--- a/Configuration/StandardSequences/python/Eras.py
+++ b/Configuration/StandardSequences/python/Eras.py
@@ -54,9 +54,11 @@ def __init__(self):
                  'Run3_2023_UPC',
                  'Run3_2024_ppRef',
                  'Run3_2024_UPC',
+                 'Run3_2024_FastSim',
                  'Run3_2025_UPC',
                  'Run3_2025_OXY',
                  'Run3_2025_UPC_OXY',
+                 'Run3_2025_FastSim',
                  'Phase2',
                  'Phase2_noMkFit',
                  'Phase2C9',