11 Best LLM RPG Games You Can Play Inside ChatGPT, Claude & Gemini Right Now

Most “AI RPG” lists are about standalone apps and Steam games — products you download, accounts you create, subscriptions you pay for. This list is different. Every entry here runs directly inside ChatGPT, Claude, or Gemini — the AI you already use, on the device you already have, with no install, no new account, and no paywall. Load a game, start playing. That’s the whole setup.

This is the niche nobody else is covering properly: LLM-native roleplay experiences designed specifically for the frontier models, built to exploit what they’re actually good at — long-form narrative, character voice, world-building — while engineering around what they’re bad at. The best ones on this list have spent serious effort solving the problems that kill most AI campaigns: memory drift, passive NPCs, and the model losing the thread around turn 50. If you want to know why those problems happen and how good engines fix them, our guide on why AI campaigns fall apart covers it in depth.

Here are eleven of the best available right now, starting with four public games we have reviewed first-hand that run inside the models themselves.

1. Solo RPG Master — Best for Multi-Genre Solo Play (ChatGPT)

Solo RPG Master is the most-played ChatGPT RPG: a multi-universe solo storyteller that lets you move between settings, with characters and romance that stand out. The worlds lean on cliché, and the stats it tracks fade as a campaign runs on. Solo RPG Master scores 2.6/5, the highest of any public game we have reviewed. Read the full review.

Runs on: ChatGPT (Custom GPT)

2. Isekai RPG — Best for an Original World (ChatGPT)

Isekai RPG is a Custom GPT with a world of its own rather than a generic backdrop: deep NPCs, tactical combat, beast taming and kingdom building in an original isekai setting. Its weakness is drift. Over a long session it wanders from its own rules, and you get the most out of it if you are willing to notice and steer it back. Isekai RPG scores 2.4/5. Read the full review.

Runs on: ChatGPT (Custom GPT)

3. Valkyrie’s Biggest Gig — Best for Cyberpunk (Claude)

Valkyrie’s Biggest Gig is a free copy-paste prompt that turns Claude into the gamemaster of a gritty solo cyberpunk campaign. Its best idea is making your body the resource you spend: limbs are lost and replaced with chrome, and the character you end with is one you edited to survive. It runs smoothly and scales to a long campaign, but the reward economy is far too generous and removes most of the tension, so trim that part of the prompt before a serious run. Valkyrie’s Biggest Gig scores 2.3/5. Read the full review.

Runs on: Claude

4. Burning Sun V2 — Best for a World That Reacts (Gemini)

Burning Sun V2 is a world-agnostic prompt for Gemini built on one line of design: have the world happen to the character, not the other way round. NPCs react to what you do in small, believable ways, and a switchable storyteller mode changes the tone of the whole story — the wrathful one is the most interesting. The NPCs react but rarely lead, and there is almost no mechanical layer underneath. Burning Sun V2 scores 2.1/5. Read the full review.

Runs on: Gemini

5. Perchance AI RPG

One of the most-searched AI RPG tools in 2026. Perchance offers a free, no-signup text RPG that runs entirely in your browser — no model subscription required. The experience is more structured than a raw LLM session, with preset scenario templates covering fantasy, sci-fi, and romance. It is the fastest way to start an AI text adventure from cold. The tradeoff is depth: Perchance uses its own model with limited context, so long campaigns degrade faster than engineered systems on frontier models. Strong starting point for newcomers; limiting for experienced players who want sustained coherence over many sessions. See how it compares to dedicated platforms in our clients directory.

Runs on: Browser (Perchance’s own model)

6. AI Dungeon

The genre’s starting point. AI Dungeon established what LLM text adventure could be and its community has built thousands of scenario templates across every genre imaginable. The fundamental tradeoff is breadth over depth: total creative freedom, but no persistent world state, no game mechanics beyond the narrative, and memory that degrades as the context fills. It shows its age against more engineered systems — but for players who want pure narrative freeform with no setup whatsoever, it remains a valid entry point. Read our full AI Dungeon review for the current verdict, including where it falls short.

Runs on: Browser, iOS, Android (multiple model tiers, freemium)

7. WyrdTale

The LLM RPG that took a fundamentally different approach to the memory problem: instead of asking the model to track state, WyrdTale keeps the world on a server — entities, saves, factions, relationships — and lets the model narrate against it. The persistence is real and measured: Memory & Continuity — 4 and Longevity — 4, among the best in our directory. For players who have been burned by LLM inconsistency, this is the most direct fix on this list. The tradeoff is authorship — it scores Player Agency — 1 because it narrates your character’s actions for you. See the full review.

Runs on: Browser, free — connects to your own Claude or ChatGPT

8. Janitor AI (with external model)

Janitor AI is the largest community character-library platform, with tens of thousands of user-created characters and the ability to connect your own API key. For LLM RPG players specifically, the “bring your own model” feature means you can connect Claude or GPT and run sessions with your preferred frontier model while browsing Janitor’s extensive character catalogue. It is a different experience from an engineered game system — more character-chat than campaign — but for players who want a massive library and model flexibility, it is one of the most useful clients available. See our full assessment in the clients directory.

Runs on: Browser (bring-your-own-model via API)

9. Friends & Fables

One of the most structured clients on this list. Friends & Fables is a visual AI game master with hex battlemaps, token movement, and a GM named Franz who actually maintains session state. For players who want tabletop RPG structure — initiative, spatial combat, party coordination — rather than pure narrative freeform, Friends & Fables is among the most complete LLM clients available — though the same studio’s successor, Craft, now scores higher on our board. The visual layer adds real tactical weight that pure text sessions lack. Full review in our clients section.

Runs on: Browser, freemium

10. A Custom Claude Project (DIY)

Worth naming explicitly: a well-crafted Claude Project with a strong system prompt and a knowledge file is a legitimate LLM RPG in its own right. Claude’s long context window, instruction-following, and prose quality make it the strongest single model for sustained narrative campaigns. If you have a specific genre, world, or tone in mind that no existing engine covers, building your own Claude Project is more achievable than it sounds. Our guide on why AI campaigns fall apart covers the engineering decisions that separate a campaign that holds together from one that collapses at turn 50 — it is the practical starting point for anyone who wants to build their own.

Runs on: Claude (Project), paid plan required

11. A Custom ChatGPT GPT

The equivalent for ChatGPT. Custom GPTs — available to ChatGPT Plus subscribers — let you package a system prompt, knowledge files, and conversation starters into a shareable game. The ecosystem of community-built GPTs includes some genuinely inventive LLM RPG experiments, and the GPT Store makes discovery easier than hunting for prompts on Reddit. The tradeoff versus Claude Projects is context length: ChatGPT handles long sessions well but can lose thread in very extended campaigns faster than Claude’s extended context. For players already on ChatGPT, building or finding a well-made Custom GPT is the natural starting point.

Runs on: ChatGPT Plus (Custom GPTs)

How to Pick the Right LLM RPG for You

The most important question is what you actually want from a campaign:

Multi-genre solo campaigns → Solo RPG Master. The highest-scoring public game we have reviewed.
An original world to explore → Isekai RPG. Deep NPCs and a setting of its own, if you steer it past the drift.
Cyberpunk on Claude → Valkyrie’s Biggest Gig. Trim the reward economy first.
A world that pushes back, on Gemini → Burning Sun V2. Pick the wrathful storyteller.
Just want to start immediately → Perchance or AI Dungeon. No setup, no files, play now.
Want a platform for long campaigns → Browse our full clients directory for an honest comparison of every major LLM roleplay platform.

Made by Arcanum, not ranked: we also publish four free prompt games of our own, the Arcanum Originals. We never score or rank our own work, so they sit outside this list.

This list is the best of the category. For the complete, continuously updated directory of every LLM RPG game across ChatGPT, Claude, and Gemini — with how Arcanum evaluates them, the full platform landscape, and a model-by-model breakdown — see The Complete Directory of LLM RPG Games.