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VECTOR WIREAI INTELLIGENCE
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Gemini 3 Flash Preview vs GPT-5.5 Instant

Google · released

Wins 7 of 8 areas

Agents · Reasoning · Facts · Images and charts · Math · Long documents · Following instructions

OpenAI · released

Wins 1 of 8 areas

Coding

Gemini 3 Flash Preview is the stronger all-rounder.GPT-5.5 Instant is better at coding.

Scores updated · 24 tests both models report · How we compare

Where each one wins

Tests won in each of the eight areas we test. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.

Long documents and following instructions rest on a single test each.

What it costs

Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.

Gemini 3 Flash Preview$0.50 to read · $3.00 to write$3.50Price from Artificial Analysis
GPT-5.5 Instant$5.00 to read · $30.00 to write$35Price from Artificial Analysis

Gemini 3 Flash Preview costs 90% less for the same work.

The biggest differences

The three tests each model wins by the widest margin. Scores are out of 100.

Where Gemini 3 Flash Preview pulls ahead

  • Short factual questions, answered correctlySimpleQA Verified+28.8points aheadGemini 3 Flash Preview66.8GPT-5.5 Instant38
  • Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+24.9points aheadGemini 3 Flash Preview51.2GPT-5.5 Instant26.3
  • Command-line tasks in a real terminalTerminal-Bench 2.1+23.2points aheadGemini 3 Flash Preview58GPT-5.5 Instant34.8

Where GPT-5.5 Instant pulls ahead

  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+27.7points aheadGPT-5.5 Instant34.7Gemini 3 Flash Preview7
  • Hard command-line tasks in a real terminalTerminal-Bench Hard+3.8points aheadGPT-5.5 Instant42.4Gemini 3 Flash Preview38.6
  • Code for real scientific research problemsSciCode+1.9points aheadGPT-5.5 Instant52.5Gemini 3 Flash Preview50.6

Every test, side by side

All 24 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingGPT-5.5 Instant

Full coding ranking

AgentsGemini 3 Flash Preview

Full agents ranking

ReasoningGemini 3 Flash Preview

Full reasoning ranking

FactsGemini 3 Flash Preview

Full facts ranking

Images and chartsGemini 3 Flash Preview

Full images and charts ranking

MathGemini 3 Flash Preview

Full math ranking

Long documentsGemini 3 Flash Preview
  • AA-LCRGemini 3 Flash Preview by 11.77866.3+11.7

Full long documents ranking

Following instructionsGemini 3 Flash Preview
  • IFBenchGemini 3 Flash Preview by 6.57871.5+6.5

Full following instructions ranking

Other results6 tests, not counted

Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.

Questions people ask

Which is better, Gemini 3 Flash Preview or GPT-5.5 Instant?

Gemini 3 Flash Preview wins seven of the eight areas we test: agents, reasoning, facts, images and charts, math, long documents and following instructions. GPT-5.5 Instant wins coding.

Which is better for coding?

GPT-5.5 Instant. It wins 2 of the 3 coding tests both models report; Gemini 3 Flash Preview wins 1.

Which is cheaper?

Gemini 3 Flash Preview costs $0.50 per million input tokens and $3.00 per million output tokens; GPT-5.5 Instant costs $5.00 and $30.00. That makes Gemini 3 Flash Preview about 90% cheaper for the same work.

How do you compare the two?

We use the 24 benchmark tests both models have published scores on. The verdict counts the 18 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 6 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.