Compare · updated 2026-11-01

GPT-6.1 Sol vs GPT-6 Luna

GPT-6.1 Sol is better at writing, coding, reasoning, maths, long documents; GPT-6 Luna is better at quick answers, structured data, translation. GPT-6 Luna is the cheaper of the two on output.

Measured quality by task

Quality is Nivana’s measured score for each kind of task, from weekly pairwise evals judged by models from several labs. Prices are live AI Gateway list prices per million tokens. Updated 2026-11-01. How this is measured.

Price and context

Which should you use?

Use the one that wins the kind of work you do most, unless the price gap outweighs the quality gap for easy requests. Or don’t choose: Nivana scores both, and the rest of the pool, on every request and sends it to whichever is best for that request.

Questions

Is GPT-6.1 Sol better than GPT-6 Luna?

On Nivana’s weekly evals GPT-6.1 Sol scores higher on 5 of 8 task types (writing, coding, reasoning, maths, long documents) and GPT-6 Luna on 3 (quick answers, structured data, translation). Neither is better at everything.

Which is better for coding, GPT-6.1 Sol or GPT-6 Luna?

GPT-6.1 Sol: 93/100 against 84/100 for GPT-6 Luna on Nivana’s coding evals.

Which is better for writing, GPT-6.1 Sol or GPT-6 Luna?

GPT-6.1 Sol: 93/100 against 90/100 for GPT-6 Luna on Nivana’s writing evals.

Which is cheaper, GPT-6.1 Sol or GPT-6 Luna?

GPT-6 Luna: $0.5 per million output tokens against $10 for GPT-6.1 Sol, about 20.0× less. A typical chat answer costs about $0.0005 on GPT-6 Luna and $0.010 on GPT-6.1 Sol.