The lineup
| Model | Quality | Plan | Context |
|---|---|---|---|
| GPT-6 Luna | Fast | Free ($0) | 1.05M tokens (922K input) |
| Claude Sonnet 5 | Balanced | Aimi+ ($15/month) | 1M tokens |
| GPT-6 Sol | Premium | Aimi Ultra ($50/month) | 1.05M tokens (922K input) |
| Claude Opus 5.5 | Genius | Aimi Genius ($100/month) | 1M tokens |
Each paid plan also includes every model from the plans below it. If a model's provider is unavailable, AimiChat may answer with a backup model so your message still goes through.
How to choose
- GPT-6 Luna (OpenAI): GPT-6 Luna is the fast, low-cost member of OpenAI's GPT-6 family.
- Claude Sonnet 5 (Anthropic): Claude Sonnet 5 is Anthropic's most capable Sonnet-class model, built for coding, agents and professional writing.
- GPT-6 Sol (OpenAI): GPT-6 Sol is OpenAI's mid-tier GPT-6 model for demanding reasoning, coding and agent work.
- Claude Opus 5.5 (Anthropic): Claude Opus 5.5 is Anthropic's newest flagship model, released September 22, 2026.
A good habit is to start with the fastest model that fits the task and move up only when the answer needs more depth. Everything stays in the same chat, so nothing is lost when you switch.
Model comparisons
- Claude Opus 5.5 vs GPT-6 Sol
- Claude Sonnet 5 vs GPT-6 Sol
- GPT-6 Sol vs GPT-6 Luna
- Claude Opus 5.5 vs Claude Sonnet 5
- Claude Sonnet 5 vs GPT-6 Luna
- Claude Opus 5.5 vs GPT-6 Luna
Comparing apps rather than models? See AI app alternatives.