Since the snail finally released one of the most deadliest planes in world history, I compiled a list using AI of all DECLASSIFIED weapons(in service ,retired or cancelled) from all DECLASSIFIED b52 variants( retired and in service):
B-52 Stratofortress weapons by model/variant (A through H). All pre-H variants are fully retired (phased out by the 1970s–1980s, with most scrapped under arms control treaties). Only the B-52H remains active (with ongoing modernization to B-52J configuration). The B-52 has never dropped a nuclear weapon in combat but has extensive conventional combat use (Vietnam, Gulf War, etc.). 
Weapons are categorized where possible as:
• Tested and released: Operationally deployed and used (combat or alert).
• Tested and not released: Tested/experimentally carried or provisioned but canceled before operational use.
• Active: Currently operational on B-52H.
• Retired: No longer in service (most nuclear gravity bombs, older missiles).
Payload is ~70,000 lb mixed ordnance max (internal bay + external pylons).
Early models focused on gravity bombs; G/H added standoff missiles. Nuclear gravity bombs are no longer carried by operational B-52s (standoff ALCM only for nuclear role). 
B-52A (3 built, retired; test/prototype only)
• Gravity bombs (nuclear/conventional): Mk 15 nuclear bombs and early thermonuclear weapons; ~10,000 lb bomb load (tested/released in trials; nuclear role tested but no combat). 
• Tail guns: Quad .50-cal machine guns.
• Tested and not released: None specific; served as NB-52A X-15 launch platform (experimental, not a weapon).
• Active/Retired: All retired.
B-52B (retired; first operational model, ~50 built including RB-52B reconnaissance)
• Gravity bombs (nuclear/conventional): Mk 15 and early thermonuclear bombs; conventional bombs up to ~24,000–27,000 lb internal (tested/released; one dropped Mk 15 over Bikini Atoll in 1956 test). 
• Tail guns: Quad .50-cal.
• Tested and not released: None major.
• Active/Retired: All retired (some converted to B-52C standard).
B-52C (retired; ~35 built)
• Gravity bombs (nuclear/conventional): Similar to B; up to ~27,000 lb internal + external tanks (tested/released in training/alert).
• Tail guns: Quad .50-cal with improved fire control.
• Tested and not released: Limited reconnaissance pod use.
• Active/Retired: All retired.
B-52D (retired; ~170 built; major Vietnam War user)
• Gravity bombs (conventional focus): Big Belly modification (1965–66) boosted internal capacity to 84×500 lb or 42×750 lb bombs (total ~60,000 lb with 108 bombs external/internal); Mk 82/84, M117; nuclear capability retained but primarily conventional carpet bombing (tested/released extensively in Arc Light/Linebacker II). 
• Tail guns: Quad .50-cal (credited with 2 MiG-21 kills in 1972).
• Tested and not released: None specific.
• Active/Retired: All retired (last ~1982–83).
B-52E (retired; ~100 built)
• Gravity bombs (nuclear/conventional): Similar to D; updated bombing/nav system; ~27,000–60,000 lb with mods.
• Tail guns: Quad .50-cal.
• Tested and not released: Engine test variants (JB-52E/NB-52E); load alleviation system tests.
• Active/Retired: All retired (most by 1969–70).
B-52F (retired; ~89 built; early Vietnam user)
• Gravity bombs (conventional): Big Belly mods for ~60,000 lb (108 bombs); external racks for 24×750 lb under Project South Bay/Sun Bath (tested/released in Vietnam carpet bombing).
• Tail guns: Quad .50-cal.
• Tested and not released: None major.
• Active/Retired: All retired (by 1973; some trainers to 1978). 
B-52G (retired; 193 built; Gulf War/Desert Storm user; first with major standoff missiles)
• Gravity bombs (nuclear/conventional): Mk 82/84, M117, cluster bombs (CBU series); Big Four mods for low-altitude; up to ~51–60,000 lb.
• Missiles:
• AGM-28 Hound Dog (nuclear standoff cruise missile; 2 per aircraft; tested/released 1960–76, retired).
• AGM-69 SRAM (up to 20 nuclear; 8 internal rotary + 12 external; tested/released 1971 onward, retired).
• AGM-86 ALCM (nuclear; up to 20; tested/released) and AGM-86C/D CALCM (conventional; launched in Desert Storm/Desert Strike/Iraqi Freedom; tested/released).
• AGM-84 Harpoon (anti-ship; up to 12 on 30 aircraft; tested/released).
• AGM-142 Have Nap (standoff; on 12 aircraft; tested/released).
• ADM-20 Quail decoys (tested/released).
• Mines: Various Mk series naval mines.
• Tested and not released: Provision for GAM-87 Skybolt (air-launched ballistic missile; pylon provision made but canceled before deployment; tested on B-52). 
• Tail guns: Quad .50-cal (later removed); then 20 mm M61 Vulcan (removed 1991–94).
• Active/Retired: All aircraft and most weapons retired (last destroyed ~2013 under START; conventional capabilities passed to H). 
B-52H (only active variant; 102 built originally; ~76 remaining, with ~46 nuclear-capable)
• Gravity bombs (conventional primarily; nuclear capability retired for gravity types): Mk 82/84, M117; cluster (CBU-87/89/97/103/104/105 WCMD); JDAM (GBU-31/38); GBU-10/12/28 LGBs; up to 51 internal + 18–24 external (tested/released in multiple wars). 
• Missiles (standoff primary):
• AGM-86B ALCM (nuclear; up to 20: 12 external + 8 internal rotary; active nuclear role).
• AGM-86C/D CALCM (conventional; tested/released in combat).
• AGM-158 JASSM/JASSM-ER (conventional standoff; up to 20: 12 external + 8 internal; active; used in recent operations). 
• AGM-154 JSOW (glide bomb; active).
• AGM-142 Have Nap/Popeye (limited; active on some configs).
• AGM-84 Harpoon (anti-ship; active).
• Mines: Mk 62/64/65 Quickstrike naval mines (active).
• Decoys/Jammers: MALD/MALD-J (active).
• Tested and released (historical on H or carried over): SRAM (up to 20; retired), AGM-129 ACM (Advanced Cruise Missile; up to 12–20 external; retired 2007–2012).

• Tested and not released:
• AGM-183A ARRW (hypersonic; captive-carry and launch tests on H; program had mixed success but not fully operational/released). 
• AGM-181 LRSO (next-gen nuclear stealth cruise missile; current captive-carry and test flights on H; in development, not yet released/operational; replacing ALCM). 
• Tail guns: 20 mm M61 Vulcan (removed 1991–94); now none.
Notes:
• Many conventional weapons (JDAM, JASSM, Harpoon, mines) are shared across late G/H and remain active on H.
• Early variants (A–F) were almost exclusively gravity-bomb focused; G/H shifted to missiles for standoff/survivability.
• Exact loadouts are mission-specific and often classified in detail. Total nuclear yield per aircraft historically very high (e.g., multiple SRAM/ALCM).
• Experimental/test roles (X-15, drones, hypersonics) used modified NB-52s but are not standard weapons.
This covers all documented weapons from historical and current sources. The B-52’s flexibility has kept it relevant for over 70 years.
There is one weapon that is not mentioned here and that is the AGM-88 HARMS(Anti radiation missile) that can be carried off platform and onto the pylons. Exact load-outs are mission specific and it depends on the pylon configuration. But if we were to add the possible maximum pylon loadout configuration. The maximum loadout for AGM-88 HARMS is 12.