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Gemini 3.5 Flash vs GLM-5.3-Flash

Google · released

Wins 4 of 8 areas

Reasoning · Facts · Math · Following instructions

Z.ai · released

Wins 3 of 8 areas

Coding · Agents · Long documents

Gemini 3.5 Flash wins more areas, narrowly.GLM-5.3-Flash is cheaper and better at agents.

Scores updated · 34 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 3.5 Flash$1.50 to read · $9.00 to write$11Price from Artificial Analysis
GLM-5.3-Flash$0.15 to read · $0.50 to write$0.65Price from Z.ai's own price page

GLM-5.3-Flash costs 94% 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 3.5 Flash pulls ahead

  • Completes tasks by operating a computer desktopOSWorld-Verified+63.6points aheadGemini 3.5 Flash78.4GLM-5.3-Flash14.8
  • Short factual questions, answered correctlySimpleQA Verified+34.2points aheadGemini 3.5 Flash66.2GLM-5.3-Flash32
  • Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+23.9points aheadGemini 3.5 Flash51.4GLM-5.3-Flash27.5

Where GLM-5.3-Flash pulls ahead

  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+34.6points aheadGLM-5.3-Flash72.4Gemini 3.5 Flash37.8
  • Complex command-line tasks across many fieldsTerminal-Bench 4.0+26.2points aheadGLM-5.3-Flash32.8Gemini 3.5 Flash6.6
  • Real work tasks from 44 professionsGDPVal+22.1points aheadGLM-5.3-Flash57.2Gemini 3.5 Flash35.1

Every test, side by side

All 34 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingGLM-5.3-Flash

Full coding ranking

AgentsGLM-5.3-Flash

Full agents ranking

ReasoningGemini 3.5 Flash

Full reasoning ranking

FactsGemini 3.5 Flash

Full facts ranking

Images and chartsEven

Full images and charts ranking

MathGemini 3.5 Flash

Full math ranking

Long documentsGLM-5.3-Flash
  • AA-LCRGLM-5.3-Flash by 6.773.380+6.7

Full long documents ranking

Following instructionsGemini 3.5 Flash

Full following instructions ranking

Other results9 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 GLM-5.3-Flash?

Gemini 3.5 Flash wins four of the eight areas we test: reasoning, facts, math and following instructions. GLM-5.3-Flash wins coding, agents and long documents, and costs 94% less. They are level on images and charts.

Which is better for coding?

GLM-5.3-Flash. It wins 3 of the 5 coding tests both models report; Gemini 3.5 Flash wins 1, and 1 is a tie.

Which is cheaper?

Gemini 3.5 Flash costs $1.50 per million input tokens and $9.00 per million output tokens; GLM-5.3-Flash costs $0.15 and $0.50. That makes GLM-5.3-Flash about 94% cheaper for the same work.

How do you compare the two?

We use the 34 benchmark tests both models have published scores on. The verdict counts the 25 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 9 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 GLM-5.3-Flash with

Z.ai

Across the field

All comparisons