Compare · updated 2026-11-01

GPT-5.5 vs Gemini Flash

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

On Nivana’s weekly evals GPT-5.5 scores higher on 5 of 8 task types (quick answers, writing, coding, reasoning, structured data) and Gemini Flash on 3 (maths, long documents, translation). Neither is better at everything.

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

GPT-5.5: 91/100 against 80/100 for Gemini Flash on Nivana’s coding evals.

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

GPT-5.5: 94/100 against 81/100 for Gemini Flash on Nivana’s writing evals.

Which is cheaper, GPT-5.5 or Gemini Flash?

Gemini Flash: $3.75 per million output tokens against $30 for GPT-5.5, about 8.0× less. A typical chat answer costs about $0.0037 on Gemini Flash and $0.029 on GPT-5.5.