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Gemini 3.5 Flash vs Seed 2.1 Pro Preview

Google · released

Wins 0 of 4 areas

—

ByteDance

Wins 2 of 4 areas

Coding · Images and charts

Seed 2.1 Pro Preview wins more areas, narrowly.

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

Where each one wins

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

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 3.5 Flash$1.50 to read · $9.00 to write$11Price from Artificial Analysis
Seed 2.1 Pro PreviewNo current price is tracked.

The biggest differences

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

Where Seed 2.1 Pro Preview pulls ahead

  • Real work tasks from 44 professionsGDPVal+52.7points aheadSeed 2.1 Pro Preview87.9Gemini 3.5 Flash35.2
  • Very hard expert questions across many subjectsHumanity's Last Exam+13points aheadSeed 2.1 Pro Preview55.7Gemini 3.5 Flash42.7
  • Code for real scientific research problemsSciCode+5.9points aheadSeed 2.1 Pro Preview59.8Gemini 3.5 Flash53.9

Where Gemini 3.5 Flash pulls ahead

  • Long professional tasks in banking, consulting and lawAA ApexAgents+13.3points aheadGemini 3.5 Flash47.1Seed 2.1 Pro Preview33.8
  • Abstract visual puzzles that people can solveARC-AGI-2+9.6points aheadGemini 3.5 Flash72.1Seed 2.1 Pro Preview62.5
  • Command-line tasks in a real terminalTerminal-Bench 2.1+7.7points aheadGemini 3.5 Flash78.7Seed 2.1 Pro Preview71

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.

CodingSeed 2.1 Pro Preview

Full coding ranking

AgentsEven

Full agents ranking

ReasoningEven

Full reasoning ranking

Images and chartsSeed 2.1 Pro Preview

Full images and charts ranking

Other results11 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 3.5 Flash or Seed 2.1 Pro Preview?

Seed 2.1 Pro Preview wins two of the four areas where both have results: coding and images and charts. Gemini 3.5 Flash wins none. They are level on agents and reasoning.

Which is better for coding?

Seed 2.1 Pro Preview. It wins 3 of the 4 coding tests both models report; Gemini 3.5 Flash wins 1.

How do you compare the two?

We use the 24 benchmark tests both models have published scores on. The verdict counts the 13 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 11 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.

Compare Gemini 3.5 Flash with

Google

Across the field

Compare Seed 2.1 Pro Preview with

ByteDance

Across the field

All comparisons