Which AI model is best?
There is no single best model for everything. The best choice depends on the job, how fast you need the answer and how much it costs to use. Here is how to choose.
By the SelGPT team. Updated
The best AI model depends on the task. In September 2026 the model behind SelGPT’s Sel-Sirius ranked #1 on the Artificial Analysis Intelligence Index, so it suits the hardest work. For everyday questions a faster model is better value, and for coding or multi-step reasoning a model built for that job usually wins.
Choose by the job
| Job | What matters | In SelGPT |
|---|---|---|
| Everyday questions and writing | Speed, low cost | Sel-Vega |
| Writing and debugging code | Code quality, speed | Sel-Altair |
| Research, analysis, maths | Careful step-by-step reasoning | Sel-Rigel |
| The hardest, highest-stakes work | Getting it right first time | Sel-Sirius |
How models are ranked
Independent leaderboards test models on the same set of tasks. The Artificial Analysis Intelligence Index combines results on reasoning, knowledge, maths and coding into one score. In September 2026 the model behind Sel-Sirius scored 58, the highest of any model tested.
Rankings change every few months as new models come out, which is one reason SelGPT gives you several models in one chat instead of tying you to one.
Questions
What is the smartest AI model right now?
In September 2026 the highest score on the Artificial Analysis Intelligence Index was 58, from the model that powers SelGPT’s Sel-Sirius. Rankings change often, so check the leaderboard for the latest.
Do I always need the best model?
No. For everyday questions and writing, a faster model gives just as good an answer for less. Save the top model for hard, high-stakes work.
Related
- Sel-SiriusSel-Sirius runs on the AI model ranked #1 on the Artificial Analysis Intelligence Index, included in SelGPT Plus from $9.99 a month billed yearly.
- ModelsMeet the four SelGPT models: Sel-Vega for everyday work, Sel-Altair for code, Sel-Rigel for reasoning and Sel-Sirius, ranked the #1 AI model.
- About SelGPTSelGPT is an AI chat app with four AI models in one chat, from free to Pro. What it is, what it costs, who it is for, and how it differs from similar names.
- AI chat without adsSelGPT has no ads on any plan, including Free, and doesn’t let AI providers train on your chats. Here is what that means and how it compares.