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Gemini 3.1 Flash Lite Preview vs Solar Pro 3

Google · released

Wins 6 of 6 areas

Coding · Agents · Reasoning · Facts · Long documents · Following instructions

Upstage · released

Wins 0 of 6 areas

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Gemini 3.1 Flash Lite Preview is the stronger all-rounder.Solar Pro 3 is cheaper.

Scores updated · 17 tests both models report · How we compare

Where each one wins

Tests won in each of the six 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.

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 3.1 Flash Lite Preview$0.25 to read · $1.50 to write$1.75Price from Artificial Analysis
Solar Pro 3$0.15 to read · $0.60 to write$0.75Price from Artificial Analysis

Solar Pro 3 costs 57% less for the same work.

The biggest differences

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

Where Gemini 3.1 Flash Lite Preview pulls ahead

  • Reasons across sets of long documentsAA-LCR+42points aheadGemini 3.1 Flash Lite Preview74.3Solar Pro 332.3
  • Command-line tasks in a real terminalTerminal-Bench 2.1+19.1points aheadGemini 3.1 Flash Lite Preview31.1Solar Pro 312
  • Code for real scientific research problemsSciCode+17.9points aheadGemini 3.1 Flash Lite Preview43.4Solar Pro 325.5

Where Solar Pro 3 pulls ahead

No clear win on a test scored out of 100.

Every test, side by side

All 17 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingGemini 3.1 Flash Lite Preview

Full coding ranking

AgentsGemini 3.1 Flash Lite Preview

Full agents ranking

ReasoningGemini 3.1 Flash Lite Preview

Full reasoning ranking

FactsGemini 3.1 Flash Lite Preview

Full facts ranking

Long documentsGemini 3.1 Flash Lite Preview
  • AA-LCRGemini 3.1 Flash Lite Preview by 4274.332.3+42

Full long documents ranking

Following instructionsGemini 3.1 Flash Lite Preview
  • IFBenchGemini 3.1 Flash Lite Preview by 677.271.2+6

Full following instructions ranking

Other results4 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 3.1 Flash Lite Preview or Solar Pro 3?

Gemini 3.1 Flash Lite Preview wins all six areas where both have results: coding, agents, reasoning, facts, long documents and following instructions. Solar Pro 3 wins none, but costs 57% less.

Which is better for coding?

Gemini 3.1 Flash Lite Preview. It wins 3 of the 3 coding tests both models report; Solar Pro 3 wins none.

Which is cheaper?

Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; Solar Pro 3 costs $0.15 and $0.60. That makes Solar Pro 3 about 57% cheaper for the same work.

How do you compare the two?

We use the 17 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 4 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.