Compare · updated 2026-11-01

GPT-5.5 vs Gemini 4 Argon

GPT-5.5 is better at quick answers, writing, coding, structured data, long documents, translation; Gemini 4 Argon is better at reasoning, maths. Gemini 4 Argon 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-5.5 better than Gemini 4 Argon?

On Nivana’s weekly evals GPT-5.5 scores higher on 6 of 8 task types (quick answers, writing, coding, structured data, long documents, translation) and Gemini 4 Argon on 2 (reasoning, maths). Neither is better at everything.

Which is better for coding, GPT-5.5 or Gemini 4 Argon?

GPT-5.5: 91/100 against 82/100 for Gemini 4 Argon on Nivana’s coding evals.

Which is better for writing, GPT-5.5 or Gemini 4 Argon?

GPT-5.5: 94/100 against 82/100 for Gemini 4 Argon on Nivana’s writing evals.

Which is cheaper, GPT-5.5 or Gemini 4 Argon?

Gemini 4 Argon: $10 per million output tokens against $30 for GPT-5.5, about 3.0× less. A typical chat answer costs about $0.010 on Gemini 4 Argon and $0.029 on GPT-5.5.