Gemini 3.1 Pro vs GLM-5.3-Flash
Wins 5 of 8 areas
Reasoning · Facts · Math · Long documents · Following instructions
Wins 3 of 8 areas
Coding · Agents · Images and charts
Gemini 3.1 Pro is the stronger all-rounder.GLM-5.3-Flash is cheaper and better at agents.
Scores updated · 38 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.
- ReasoningHard problems that need careful thinking50Gemini 3.1 Pro5 of 5 tests
- MathCompetition and research-level math30Gemini 3.1 Pro3 of 3 tests
- FactsGetting facts right instead of making them up21Gemini 3.1 Pro2 of 3 tests
- Long documentsFinding answers in very long texts10Gemini 3.1 Pro1 of 1 test
- Following instructionsDoing exactly what it is asked10Gemini 3.1 Pro1 of 1 test
- AgentsCarrying out multi-step tasks on its own14GLM-5.3-Flash4 of 5 tests
- CodingWriting and fixing software24GLM-5.3-Flash4 of 6 tests
- Images and chartsUnderstanding pictures, charts and video01GLM-5.3-Flash1 of 2 tests · 1 tie
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.
GLM-5.3-Flash costs 95% 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
- Completes tasks by operating a computer desktopOSWorld-Verified+61.4points ahead
- Short factual questions, answered correctlySimpleQA Verified+41.5points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+27.4points ahead
Where GLM-5.3-Flash pulls ahead
- Real work tasks from 44 professionsGDPVal+42.6points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+28.8points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+25.8points ahead
Every test, side by side
All 38 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGLM-5.3-Flash
- LMArena · WebDevGLM-5.3-Flash by 158 rating points14471605+158 rating
- LiveBench · Agentic CodingGLM-5.3-Flash by 12.744.156.8+12.7
- LiveCodeBench v6Gemini 3.1 Pro by 11.191.780.6+11.1
- Terminal-Bench 2.1GLM-5.3-Flash by 10.573.884.3+10.5
- SciCodeGemini 3.1 Pro by 7.158.751.6+7.1
- LiveBench · CodingGLM-5.3-Flash by 2.576.579+2.5
AgentsGLM-5.3-Flash
- OSWorld-VerifiedGemini 3.1 Pro by 61.476.214.8+61.4
- GDPValGLM-5.3-Flash by 42.614.657.2+42.6
- Terminal-Bench 4.0GLM-5.3-Flash by 28.8432.8+28.8
- τ-Bench V3 · BankingGLM-5.3-Flash by 25.821.447.2+25.8
- AA IT-Bench SREGLM-5.3-Flash by 20.930.351.2+20.9
ReasoningGemini 3.1 Pro
- ARC-AGI-2Gemini 3.1 Pro by 11.377.165.8+11.3
- Humanity's Last ExamGemini 3.1 Pro by 7.14739.9+7.1
- LiveBench · ReasoningGemini 3.1 Pro by 6.48477.6+6.4
- GPQA DiamondGemini 3.1 Pro by 2.994.191.2+2.9
- CritPtGemini 3.1 Pro by 2.317.715.4+2.3
FactsGemini 3.1 Pro
- SimpleQA VerifiedGemini 3.1 Pro by 41.573.532+41.5
- AA-Omniscience · AccuracyGemini 3.1 Pro by 27.454.927.5+27.4
- AA-Omniscience · Non-hallucinationGLM-5.3-Flash by 23.349.172.4+23.3
Images and chartsGLM-5.3-Flash
- CharXiv (RQ)GLM-5.3-Flash by 6.183.389.4+6.1
- LMArena · Visiontie12961296tie
MathGemini 3.1 Pro
- LiveBench · MathematicsGemini 3.1 Pro by 9.89181.2+9.8
- FrontierMath Tier 4Gemini 3.1 Pro by 9.726.817.1+9.7
- FrontierMath Tiers 1-3 (v2)Gemini 3.1 Pro by 3.959.655.8+3.9
Following instructionsGemini 3.1 Pro
- LiveBench · Instruction FollowingGemini 3.1 Pro by 26.379.152.8+26.3
Other results12 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.
- DeepSWE 1.1GLM-5.3-Flash by 51.41263.4+51.4
- AA Agentic IndexGLM-5.3-Flash by 40.910.351.2+40.9
- ToolathlonGLM-5.3-Flash by 29.648.878.4+29.6
- AA-OmniscienceGemini 3.1 Pro by 24.431.97.5+24.4
- NL2RepoGLM-5.3-Flash by 22.933.456.3+22.9
- AA IntelligenceGLM-5.3-Flash by 12.129.741.8+12.1
- OfficeQA ProGemini 3.1 Pro by 10.172.562.4+10.1
- livebench_languageGemini 3.1 Pro by 8.185.477.3+8.1
- ARC-AGI-1Gemini 3.1 Pro by 79891+7
- Artificial Analysis Coding IndexGLM-5.3-Flash by 2.768.871.5+2.7
- livebench_data_analysisGemini 3.1 Pro by 2.178.576.4+2.1
- BabyVisionGemini 3.1 Pro by 154.453.4+1
Questions people ask
Which is better, Gemini 3.1 Pro or GLM-5.3-Flash?
Gemini 3.1 Pro wins five of the eight areas we test: reasoning, facts, math, long documents and following instructions. GLM-5.3-Flash wins coding, agents and images and charts, and costs 95% less.
Which is better for coding?
GLM-5.3-Flash. It wins 4 of the 6 coding tests both models report; Gemini 3.1 Pro wins 2.
Which is cheaper?
Gemini 3.1 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; GLM-5.3-Flash costs $0.15 and $0.50. That makes GLM-5.3-Flash about 95% cheaper for the same work.
How do you compare the two?
We use the 38 benchmark tests both models have published scores on. The verdict counts the 26 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 12 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.