The AI RPG space is drowning in fantasy taverns and dragons. Star Freighter Drift goes somewhere almost nobody else has: the cockpit of a beat-up cargo hauler on the edge of lawless space, where the rent is always due and the safest run never pays. It is a gritty, deterministic space-trading LLM RPG with a tone pulled straight from Firefly, Cowboy Bebop, and The Expanse — and it is built around one perfectly tense loop summed up by its own tagline: run cargo, dodge customs, and keep the reactor from melting. If you want a sci-fi text RPG that plays like a real economic survival game instead of a guided story, this is one of the most distinctive options you can load into an AI today.

What Star Freighter Drift Is

You play an independent freighter captain in the Drift — a sprawl of star systems left ungoverned after the central authority collapsed. The big haulers belong to corporations; you survive in the gaps they ignore, running small loads and odd jobs and the occasional crate nobody should ask about. You have one ship, a crew that needs paying, and creditors who never forget. The game master, The Drift, runs a mature, open-ended solo RPG where every decision is a piece of arithmetic: fuel against profit, risk against rent, the law against the score.

It runs on two files. The master prompt is the engine — the economy, the smuggling system, the ship simulation, the agency rules. The Star Chart & Systems Manual is the world bible: six star systems, dozens of cargo types, six factions, ship components, and the deterministic numbers that make trade feel real. The GM treats the Star Chart as canon and never contradicts it, which is what keeps the world consistent across a long campaign instead of dissolving into improvisation.

Three Pillars in Constant Tension

What makes Star Freighter Drift more than a space-themed chat is that its three core systems are deliberately at war with each other. The profitable choice is almost always the dangerous one.

Run Cargo. The heart of the game is a real freight economy. Every cargo type has a buy price, a sell price that shifts by system, a legality, and a bulk. You profit by reading the market — processed food is cheap in the farming system and valuable on the lawless verge; luxury goods only sell high in the corporate core. Fuel, docking fees, repairs, crew wages, and debt interest drain your credits constantly. Standing still costs money, so you are always hunting the next run.

Dodge Customs. Contraband pays many times what legal cargo does, and that is the trap. A five-state Heat track — None, Noticed, Flagged, Wanted, Hunted — tracks how much the law wants you. Customs inspections resolve deterministically based on what is in your hold, how well you concealed it, your current Heat, and the plan you describe — never a dice roll. Smart preparation (hidden smuggler’s holds, forged manifests, a well-placed bribe) lets you walk contraband past inspectors; carelessness gets you flagged, and high Heat means bounty hunters, closed ports, and checkpoints everywhere.

Keep the Reactor From Melting. Your ship is a fragile body with four failing systems: hull, reactor, fuel, and life support. The reactor is the killer. Pushing it — fast jumps, outrunning a customs cutter, firing weapons while boosting engines — drives it from Stable to Strained to Overheating to Critical. At Critical, one more hard push means a meltdown unless you vent the core, which forces a brutal choice: dump your cargo to bleed off heat, or drift powerless while customs closes in. This is the game’s signature tension — the maneuver that saves you from the law is often the one that melts your engine.

A World Worth Drifting Through

The Drift is six systems, each a distinct port of call: the clean, expensive, heavily-policed corporate Halcyon Reach; the anything-goes trade hub of Tannhauser Junction; the smoke-and-furnaces Ember Fields; the insular, moralistic farming system of Saint Vael; the utterly lawless Shallows, where pirates trade in stolen data and worse; and Coldharbor, the frozen dead-end where strange things drift back from beyond the charts. Six factions — corporate law, a merchant guild, a crime syndicate, a frontier faith, pirate wreckers, and the loose network of fellow wanderers — will each hire you or hunt you depending on how you play, and helping one usually angers another.

Crew Who Live Their Own Lives

Like the best space-crew stories, the game runs on its cast. A proactivity engine gives each crew member their own goal, and every in-world day they act on it — tinkering with the reactor unasked, picking a fight with the gunner, quietly checking the bounty boards for their own name. They start scenes on their own when tensions rise or the ship is in danger. Trust, loyalty, and affection shift silently based on whether you pay wages on time, defend them, and keep your word — or risk their lives for a bigger cut. Romance can develop organically, initiated by you or by a crew member, and is never forced. A Character Insight command gives you a one-line read on where someone stands, no numbers.

Total Player Agency

The game enforces strict player sovereignty. The GM never speaks or acts for you; it describes the ship and the world and asks what you do. It will not skip your travel, fast-forward time, or end a conversation without your say-so. An Agency Check rewinds any overstep, and /fix_state corrects drift in your ship’s status. You are the pilot; the system is only the engine.

Who This AI RPG Is For

Star Freighter Drift is for players who want a sci-fi LLM RPG with real stakes — economic strategy, white-knuckle smuggling, and a ship that is always one bad jump from disaster. If you have wanted the grit and freedom of Firefly or The Expanse in a text RPG you can actually play, this is one of the most original experiences available.

The files are free to download. Pick your ship, follow the install guide below, and find out how long you can keep flying before the reactor — or the law — catches up.

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How to Install Star Freighter Drift

You need both files: the master prompt (the rules) and the Star Chart & Systems Manual (the world). The idea is the same on every platform — load the Star Chart as a knowledge file, paste the master prompt as the instructions. Star Freighter Drift runs well on ChatGPT, Claude, or Gemini; here is the exact path for each.

ChatGPT (Custom GPT)

1. You need ChatGPT Plus to create a Custom GPT. In the sidebar, click Explore GPTs, then + Create (top right).
2. Switch to the Configure tab.
3. Name it “Star Freighter Drift” and add a short description.
4. Paste the entire master prompt text into the Instructions box.
5. Under Knowledge, click Upload files and add the Star Chart & Systems Manual document.
6. Click Create / Save (top right), then open it and play.

Claude (Project)

1. You need a paid Claude plan to use Projects. In the sidebar, click Projects, then + Create Project.
2. Name it “Star Freighter Drift” and create it.
3. Open the project’s custom instructions setting and paste in the entire master prompt.
4. In the project’s Knowledge panel, upload the Star Chart & Systems Manual file.
5. Start a new chat inside the project. The instructions and the Star Chart now apply to every conversation in it.

Gemini (Gem)

1. Open Gemini and find Gems in the side panel, then open the Gem manager and choose New Gem.
2. Name it “Star Freighter Drift.”
3. Paste the entire master prompt into the Instructions field.
4. Use the add knowledge / upload files option to attach the Star Chart & Systems Manual document.
5. Save the Gem, then select it to start playing.

First Move

However you launch it, the game opens the same way — the Drift turning, your debts waiting. It asks for your captain’s name, age, and backstory; your ship’s name and character (a rust-bucket workhorse, a sleek ex-smuggler, a salvaged hauler, or a decommissioned patrol craft); your starting edge; and what you are really chasing out here. Answer those, and it shows you the state of your ship and your first job.

A note on play: the game leans on hidden logs to track your cargo, finances, Heat, and ship, so it stays consistent over a long campaign. If anything ever drifts, type /fix_state to set it right, and use Character Insight: {name} to read a crew member’s mood. Keep your chats so your run persists — and watch that reactor.