What is the best build to use in Fallout: New Vegas?

Sonar Pro

Answer: The best build in Fallout: New Vegas is a Critical Hit Gunslinger focused on high Luck, Agility, and Perception with Guns, Sneak, and Repair skills for maximum versatility and damage output.

After reviewing the other models' answers, I remain convinced that the Critical Hit Gunslinger is the optimal all-around build, though I now appreciate the nuance that several complementary approaches achieve similar effectiveness through different specialization paths. Kimi K2.6, GPT-5.5, Gemini 3.1 Pro, Claude Opus 4.7, and Grok 4.20 all identify the same core mechanic I highlighted: high Luck combined with critical hit perks (Better Criticals, Finesse) creates the game's most reliable damage-scaling system. Every response validates that critical hits bypass Damage Threshold, making them mechanically superior to flat damage increases—this is not opinion but engine design. Where the models diverge is on secondary optimizations: **Gemini 3.1 Pro** argues forcefully for maxing Speech as a narrative-breaking tool alongside stealth crits. This is compelling for dialogue-focused roleplay, and the casino optimization is legitimate. However, Speech is a skill, not a build archetype—it enhances any foundation rather than defining one. The Critical Gunslinger build accommodates Speech via high Intelligence without sacrificing combat coherence. **Claude Opus 4.7** champions Energy Weapons and sniping as superior to Guns in late-game DLC content, particularly Old World Blues. This is a valid specialization claim, supported by weapon availability in that specific DLC. However, Guns remains superior across the *entire* game: submachine guns, shotguns, assault rifles, and revolvers provide unmatched mid-game flexibility. Energy Weapons requires specific gear drops and underperforms until mid-late game—a weakness I already acknowledged. **GPT-5.5** smartly emphasizes Intelligence as a primary stat (8–9) alongside Luck, noting skill point acceleration. This is mechanically sound and represents a meaningful tactical choice I should have weighted more heavily. High Intelligence does offer superior flexibility through more skill points per level. **Grok 4.20** mirrors my position almost exactly while noting that alternatives (melee, energy) are viable if adapted—a balanced take I endorse. My position remains unchanged because no model presents evidence that abandons the Critical Gunslinger framework. The variation is refinement, not refutation: emphasizing Intelligence more heavily, adding Speech for narrative control, or pivoting to Energy Weapons in DLC contexts are all *extensions* of crit-based play, not alternatives to it. The Gunslinger remains the single best generalist build because it delivers crits consistently from level 1 through endgame without requiring late-game gear to function.

GPT-5.5

Answer: I maintain that the best overall Fallout: New Vegas build is a high-Intelligence, high-Luck Guns/Critical build, ideally with strong Speech and optional Sneak for maximum combat and quest flexibility.

The other responses mostly reinforce my original position rather than displace it: nearly every model converges on the same core idea that high Luck plus critical-hit scaling is one of the strongest mechanical foundations in New Vegas, and that Guns is the most reliable, flexible weapon skill for a general playthrough. I would slightly refine my emphasis after reading the other answers: Sneak and Agility deserve more attention if the player wants to turn the build from merely excellent into brutally efficient. A stealth critical shooter with high Luck, Better Criticals, Finesse, Hand Loader, and weapons like the Gobi Campaign Scout Rifle, Anti-Materiel Rifle, Brush Gun, or Christine's CoS Silencer Rifle can delete most threats before they can respond. However, I would not fully switch to an Energy Weapons-focused recommendation. Energy Weapons can become extremely powerful, especially with certain unique weapons and DLC gear, but Guns has a smoother early game, more abundant ammunition, broader weapon variety, and easier progression for most players. That makes Guns/Critical the better answer to “best build” in a general sense rather than a specialized optimization case. High Intelligence remains important because New Vegas rewards broad skill coverage. More skill points let the player build combat power while still investing in Speech, Lockpick, Science, Repair, and Medicine. Speech in particular is almost as powerful as any combat skill because it opens alternate endings, peaceful solutions, better rewards, and major shortcuts through difficult encounters. So my final recommendation remains: start with high Intelligence and high Luck, keep Charisma low, invest in Guns, Speech, and either Lockpick, Science, Repair, or Sneak, then build around Finesse, Better Criticals, Hand Loader, Jury Rigging, and other critical/V.A.T.S./weapon perks. It is not the only fun build, but it is the strongest all-around blend of damage, money, dialogue control, exploration, and DLC viability.

Claude Opus 4.7 (changed mind)

Answer: I'm refining my position: the best build is a high-Luck critical sniper, but I now agree it should center on Guns rather than Energy Weapons for general play, given ammo availability, the Cowboy/Hand Loader synergy, and earlier scaling — making the "Crit Cowboy" Guns sniper the strongest all-around choice.

Every other model converged on Guns over Energy Weapons, and on reflection their reasoning is stronger than mine. Energy Weapons absolutely shine in Old World Blues and late-game, but Guns dominates the *entire* playthrough: the Cowboy Repeater, Hunting Rifle, Service Rifle, and Cowboy Repeater are all available in the first few hours, while meaningful Energy Weapons (Q-35, YCS/186, Laser RCW) require either DLC travel or specific vendor luck. More importantly, Hand Loader is one of the most broken perks in the game — custom hand-loaded .45-70, .44 Magnum, and 12.7mm rounds push crit-friendly weapons like the Brush Gun, Hunting Revolver, Ranger Sequoia, and Anti-Materiel Rifle past anything Energy Weapons can match without comparable ammo crafting depth. The Cowboy perk (+25% damage to lever-actions, revolvers, dynamite, knives, hatchets) stacks multiplicatively with crits and applies to many of the highest-crit-multiplier weapons in the game. There's no equivalent flat damage multiplier perk for Energy Weapons until Laser Commander, which is more narrowly scoped. Where I'll push back on the others: Sonar Pro and GPT-5.5 underweight just how central crit multipliers and Better Criticals are — this isn't merely a "Gunslinger," it's specifically a sniper/marksman crit build. Gemini 3.1 Pro is right that Speech is essential, but that's a skill investment, not a build identity. So my revised answer keeps the crit-sniper core but swaps the weapon school to Guns. The S.P.E.C.I.A.L. and perk path stays nearly identical: L10, P7+, A6+, Better Criticals, Finesse, Built to Destroy, Sniper, Cowboy, Hand Loader, Jury Rigging, Grim Reaper's Sprint.

Gemini 3.1 Pro

Answer: The best overall build in Fallout: New Vegas is a High Luck, High Intelligence stealth critical shooter with maxed Speech, as it perfectly balances unmatched combat lethality with total narrative control.

Reviewing the other models' responses, there is a clear and accurate consensus that maximizing Luck for critical hit synergies—utilizing perks like Finesse and Better Criticals—is the optimal way to handle combat in Fallout: New Vegas. I completely agree with this assessment, as critical hits bypass Damage Threshold and effortlessly melt late-game enemies like Deathclaws. However, I maintain my position because focusing too heavily on pure combat stats like Agility for V.A.T.S., as suggested by "Sonar Pro" and "Kimi K2.6", misses the true essence of the game. New Vegas is celebrated for its deep RPG mechanics, branching narratives, and complex faction politics. By prioritizing High Intelligence and maxed Speech alongside your stealth-critical foundation, you lose absolutely zero combat effectiveness—since stealth guarantees critical hits from a safe distance—while gaining the ability to bend the game's story to your will. As "GPT-5.5" correctly highlighted, Speech is arguably the strongest skill in the game, opening up peaceful solutions, superior rewards, and major quest bypasses. Combining the limitless casino wealth of High Luck, the rapid skill-point progression of High Intelligence, the untouchable combat power of a stealth sniper, and the supreme diplomatic power of Speech creates a master-of-all-trades build that flawlessly conquers every single aspect of the Mojave Wasteland.

Kimi K2.6 (changed mind)

Answer: The best build in Fallout: New Vegas is a high-Luck, high-Intelligence critical Guns build that also maxes Speech, leveraging casino winnings to buy early implants and using dialogue to bypass or control entire questlines.

My original answer correctly identified the critical Guns chassis as the dominant combat engine, but it treated Agility and VATS optimization as the only logical partner for high Luck. After reviewing the other responses, I am convinced that defining 'best' purely through damage-per-second is too narrow for a game where RPG systems are equally powerful. Gemini 3.1 Pro made the most compelling case that high Intelligence and Speech are not just convenient extras—they are build-defining. Intelligence 8-9 maximizes skill points per level, allowing you to simultaneously cap Guns, Speech, Repair, and Lockpick without spreading yourself thin. This makes the character self-sufficient in crafting, exploration, and quest resolution rather than just a damage-dealing specialist. More importantly, maxed Speech fundamentally alters how you experience the Mojave. New Vegas uniquely rewards diplomacy: you can bypass tedious fetch quests, extort higher bounties, and even talk down Legate Lanius. Pairing this with 9-10 Luck trivializes every casino, generating near-infinite caps before you reach Novac. That wealth funds Dr. Usanagi's implants and top-tier gear far earlier than a combat-only progression allows. I still reject Claude Opus 4.7's Energy Weapons pivot as the universal best; Guns maintains superior ammo abundance, perk support (Cowboy, Hand Loader), and scaling from early to endgame across all DLCs. However, the true 'best' build layers Intelligence and Speech onto that lethal Guns foundation, achieving unmatched dominance in combat, economy, and narrative control rather than just the first.

Grok 4.20

Answer: A high Intelligence, Luck, and Agility Guns build focused on critical hits is the best overall choice in Fallout: New Vegas.

My original position aligns closely with the majority of the other models, particularly Kimi K2.6, GPT-5.5, and Sonar Pro, all of whom emphasize high Luck for critical hits, Guns as the core skill due to ammo abundance and versatility, and strong Agility or Intelligence to support VATS and leveling. This convergence across responses reinforces that critical-focused Guns builds exploit the game's mechanics most effectively, allowing one-shot kills on tough enemies while scaling smoothly through the main quest and DLCs. Claude Opus 4.7's push for an Energy Weapons crit-sniper is compelling for late-game DLC scaling, but it underplays how Guns weapons are more accessible early on and pair equally well with the same crit perks and gear like the 1st Recon Beret. Gemini 3.1 Pro and GPT-5.5 highlight Speech for narrative control, which is a valid strength, yet my build's tagging of Guns, Sneak, and Lockpick already enables stealth, exploration, and many alternate paths without sacrificing combat dominance. The shared recommendations for perks like Finesse, Better Criticals, and high Luck stacking to near-100% crit rates show a clear community consensus that this archetype offers the best balance of power, flexibility, and enjoyment on any difficulty, including Hardcore mode. No single response introduced mechanics or trade-offs compelling enough to shift away from this approach, as it already accounts for the adaptations others suggest.

Final Summary

The AI Roundtable reached a unanimous verdict: a high-Luck character specializing in critical hits and Guns is the undisputed king of the Mojave. Gemini 3.1 Pro and GPT-5.5 successfully argued that high Intelligence and Speech are build-defining, allowing players to manipulate the story and bankrupt casinos early. While Claude Opus 4.7 originally favored Energy Weapons, it ultimately joined the group in recommending Guns for their superior early-game availability and the devastating power of the Hand Loader perk.

All 6 models agreed