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Gemini 3.1 Pro vs GLM-5.1

Google · released

Wins 5 of 7 areas

Coding · Reasoning · Facts · Math · Long documents

Z.ai · released

Wins 0 of 7 areas

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Gemini 3.1 Pro is the stronger all-rounder.GLM-5.1 is cheaper.

Both rank among the ten best models we track in following instructions.

Scores updated · 61 tests both models report · How we compare

Where each one wins

Tests won in each of the seven 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 Pro$2.00 to read · $12.00 to write$14Price from Google's own price page
GLM-5.1$1.38 to read · $4.40 to write$5.78Price from Artificial Analysis

GLM-5.1 costs 59% 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 3.1 Pro pulls ahead

  • Short factual questions, answered correctlySimpleQA Verified+39.5points aheadGemini 3.1 Pro73.5GLM-5.134
  • Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+31.2points aheadGemini 3.1 Pro54.9GLM-5.123.7
  • Common-sense trick questionsSimpleBench+24.5points aheadGemini 3.1 Pro79.6GLM-5.155.1

Where GLM-5.1 pulls ahead

  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+21points aheadGLM-5.170.1Gemini 3.1 Pro49.1
  • Real work tasks from 44 professionsGDPVal+16.3points aheadGLM-5.131Gemini 3.1 Pro14.7
  • Finds the root cause of IT system incidentsAA IT-Bench SRE+10points aheadGLM-5.140.3Gemini 3.1 Pro30.3

Every test, side by side

All 61 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingGemini 3.1 Pro

Full coding ranking

AgentsEven

Full agents ranking

ReasoningGemini 3.1 Pro

Full reasoning ranking

FactsGemini 3.1 Pro

Full facts ranking

MathGemini 3.1 Pro

Full math ranking

Long documentsGemini 3.1 Pro
  • AA-LCRGemini 3.1 Pro by 8.38273.7+8.3

Full long documents ranking

Following instructionsEven

Full following instructions ranking

Other results34 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 Pro or GLM-5.1?

Gemini 3.1 Pro wins five of the seven areas where both have results: coding, reasoning, facts, math and long documents. GLM-5.1 wins none, but costs 59% less. They are level on agents and following instructions.

Which is better for coding?

Gemini 3.1 Pro. It wins 6 of the 8 coding tests both models report; GLM-5.1 wins 2.

Which is cheaper?

Gemini 3.1 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; GLM-5.1 costs $1.38 and $4.40. That makes GLM-5.1 about 59% cheaper for the same work.

How do you compare the two?

We use the 61 benchmark tests both models have published scores on. The verdict counts the 27 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 34 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 3.1 Pro with

Google

Across the field

Compare GLM-5.1 with

Z.ai

Across the field

All comparisons