Compare · updated 2026-11-01
GPT-6 Luna vs Gemini 4 Argon
GPT-6 Luna is better at quick answers, writing, coding, structured data, translation; Gemini 4 Argon is better at reasoning, maths, long documents. GPT-6 Luna is the cheaper of the two on output.
Measured quality by task
| Task | GPT-6 Luna | Gemini 4 Argon | Better |
|---|---|---|---|
| Quick answers | 93/100 | 88/100 | GPT-6 Luna |
| Writing | 90/100 | 82/100 | GPT-6 Luna |
| Coding | 84/100 | 82/100 | GPT-6 Luna |
| Reasoning | 77/100 | 82/100 | Gemini 4 Argon |
| Maths | 70/100 | 86/100 | Gemini 4 Argon |
| Structured data | 93/100 | 93/100 | GPT-6 Luna |
| Long documents | 88/100 | 92/100 | Gemini 4 Argon |
| Translation | 90/100 | 88/100 | GPT-6 Luna |
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
| GPT-6 Luna | Gemini 4 Argon | |
|---|---|---|
| Lab | OpenAI | |
| Input per 1M tokens | $0.1 | $2 |
| Output per 1M tokens | $0.5 | $10 |
| Typical chat answer | $0.00050 | $0.010 |
| Context window | 1.05M | 1M |
| Router picks it for | 16 of 24 request types | Fallback only |
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 Luna better than Gemini 4 Argon?
On Nivana’s weekly evals GPT-6 Luna scores higher on 5 of 8 task types (quick answers, writing, coding, structured data, translation) and Gemini 4 Argon on 3 (reasoning, maths, long documents). Neither is better at everything.
Which is better for coding, GPT-6 Luna or Gemini 4 Argon?
GPT-6 Luna: 84/100 against 82/100 for Gemini 4 Argon on Nivana’s coding evals.
Which is better for writing, GPT-6 Luna or Gemini 4 Argon?
GPT-6 Luna: 90/100 against 82/100 for Gemini 4 Argon on Nivana’s writing evals.
Which is cheaper, GPT-6 Luna or Gemini 4 Argon?
GPT-6 Luna: $0.5 per million output tokens against $10 for Gemini 4 Argon, about 20.0× less. A typical chat answer costs about $0.0005 on GPT-6 Luna and $0.010 on Gemini 4 Argon.
Or let the router pick, per request
Nivana sends every message to the model that scores best for it, sets how hard it thinks, and tells you which one answered. 2,000 free credits to start, no card.