# Model Choices | Lunafic Source: https://lunafic.ai/docs/model-choices | Published: 2026-08-26T04:00:16.760Z | Updated: 2026-10-09T03:41:37.659Z | Author: Lunafic Team | Tags: Memory and AI > Tiers are speed and depth, not model names. When to use Flash, Standard, or Pro, what the thinking level does, and how credits reset monthly. You are here to play a scene, so Lunafic hides the model names and lets you pick a feel. Each tier is a bundle of speed, depth and cost, and when better engines arrive, the tier inherits them. ## Tiers - **Flash. **The fastest replies. Good for light exchanges and quick back and forth. - **Standard. **A balance of speed and depth for everyday scenes. - **Pro. **The deepest scenes and the steadiest voices. The strongest tier today. The Free plan uses Flash. Standard and Pro come with paid plans, and a locked tier shows an upgrade card. The picker sits beside the reply line, and it steps aside while you type. Your pick is remembered for the next session. ## Thinking level Some tiers let you set how long the model thinks before it answers, from off up through Low, Medium, High and Max. Thinking is where the model holds the whole scene in mind, like who knows what and who wants what. High is a good sweet spot, and Max is very slow. Match it to the scene. Thinking on for a quick exchange wastes patience, and thinking off for a confession wastes the scene. ## The blurred thinking bar While the AI works, a blurred bar sits above the reply. Tap it to open the model's live thinking. The blur is deliberate, because you came for the story and not the machinery. Open it when you are curious, or when a reply is taking unusually long. ## When a reply gets stuck Once in a while an AI model trips over its own thinking and repeats one word or one sentence to itself, and the reply never arrives. Every engine does this sometimes. Your story did not cause it, and nothing from the stuck attempt is added to your story. - Unusual silence. **A Flash reply normally lands within seconds. If a minute passed with no text, look closer.** - Open the thinking bar. **If the same word or sentence repeats, the model is stuck.** Lunafic watches for this and ends the stuck attempt by itself, with a short note that nothing was added. Send your reply again, because the next attempt starts fresh and almost always works. If it keeps happening in one session, switch to another tier for a moment, then switch back. ## Which one, when - **Drafting and banter. **Flash or Standard. - **A scene with real weight. **Pro. - **The climax, the reveal, the goodbye. **Pro with thinking turned up. Nothing is locked in. Draft a whole session on Flash, then switch to Pro for the one scene that matters, inside the same story. --- Read this on Lunafic: https://lunafic.ai/docs/model-choices More from Lunafic: https://lunafic.ai/docs What is Lunafic: https://lunafic.ai/ai-roleplay AI characters you build stories with over long memories. You play as your character, the AI plays everyone else, and stories stay private by default.