GLM-5.3 vs GLM-5.3-Flash
Wins 6 of 7 areas
Coding · Agents · Reasoning · Facts · Math · Following instructions
Wins 0 of 7 areas
—
GLM-5.3 is the stronger all-rounder.GLM-5.3-Flash is cheaper.
Scores updated · 36 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.
- CodingWriting and fixing software30GLM-5.33 of 5 tests · 2 ties
- ReasoningHard problems that need careful thinking30GLM-5.33 of 4 tests · 1 tie
- MathCompetition and research-level math30GLM-5.33 of 3 tests
- AgentsCarrying out multi-step tasks on its own21GLM-5.32 of 4 tests · 1 tie
- FactsGetting facts right instead of making them up21GLM-5.32 of 3 tests
- Following instructionsDoing exactly what it is asked10GLM-5.31 of 1 test
- Long documentsFinding answers in very long texts00Even0 each · 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 89% 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 GLM-5.3 pulls ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+16.5points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+13points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+12.2points ahead
Where GLM-5.3-Flash pulls ahead
- Finds the root cause of IT system incidentsAA IT-Bench SRE+5.1points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+2points ahead
Every test, side by side
All 36 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGLM-5.3
- SciCodeGLM-5.3 by 7.45951.6+7.4
- LiveBench · Agentic CodingGLM-5.3 by 4.160.956.8+4.1
- LMArena · WebDevGLM-5.3 by 13 rating points16221609+13 rating
- Terminal-Bench 2.1tie83.984.3tie
- LiveBench · Codingtie7979tie
AgentsGLM-5.3
- Terminal-Bench 4.0GLM-5.3 by 9.141.932.8+9.1
- AA IT-Bench SREGLM-5.3-Flash by 5.146.151.2+5.1
- τ-Bench V3 · BankingGLM-5.3 by 3.150.347.2+3.1
- GDPValtie57.557.2tie
ReasoningGLM-5.3
- LiveBench · ReasoningGLM-5.3 by 8.285.877.6+8.2
- CritPtGLM-5.3 by 3.719.115.4+3.7
- Humanity's Last ExamGLM-5.3 by 2.442.339.9+2.4
- GPQA Diamondtie91.791.2tie
FactsGLM-5.3
- SimpleQA VerifiedGLM-5.3 by 94132+9
- AA-Omniscience · AccuracyGLM-5.3 by 6.433.927.5+6.4
- AA-Omniscience · Non-hallucinationGLM-5.3-Flash by 270.472.4+2
MathGLM-5.3
- FrontierMath Tiers 1-3 (v2)GLM-5.3 by 1368.855.8+13
- FrontierMath Tier 4GLM-5.3 by 12.229.317.1+12.2
- LiveBench · MathematicsGLM-5.3 by 6.787.981.2+6.7
Following instructionsGLM-5.3
- LiveBench · Instruction FollowingGLM-5.3 by 16.569.352.8+16.5
Other results15 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.
- CritPt v2 HardGLM-5.3 by 933.524.5+9
- AA-OmniscienceGLM-5.3 by 6.814.37.5+6.8
- livebench_data_analysisGLM-5.3-Flash by 6.270.276.4+6.2
- ToolathlonGLM-5.3-Flash by 5.47378.4+5.4
- Terminal-Bench-Science 0.1GLM-5.3 by 4.79.54.8+4.7
- GDP (Surge AI)GLM-5.3-Flash by 4.211.215.4+4.2
- DeepSWE 1.1GLM-5.3 by 3.566.963.4+3.5
- Artificial Analysis Coding IndexGLM-5.3 by 3.374.871.5+3.3
- AA IntelligenceGLM-5.3 by 344.841.8+3
- livebench_languageGLM-5.3 by 2.679.977.3+2.6
- PostTrain Bench v1.2GLM-5.3-Flash by 2.334.536.8+2.3
- AA Agentic IndexGLM-5.3 by 2.253.451.2+2.2
- Agents' Last ExamGLM-5.3 by 2.228.526.3+2.2
- NL2RepoGLM-5.3 by 1.75856.3+1.7
- HLE-Diamondtie17.918.2tie
Questions people ask
Which is better, GLM-5.3 or GLM-5.3-Flash?
GLM-5.3 wins six of the seven areas where both have results: coding, agents, reasoning, facts, math and following instructions. GLM-5.3-Flash wins none, but costs 89% less. They are level on long documents.
Which is better for coding?
GLM-5.3. It wins 3 of the 5 coding tests both models report; GLM-5.3-Flash wins none, and 2 are ties.
Which is cheaper?
GLM-5.3 costs $1.40 per million input tokens and $4.40 per million output tokens; GLM-5.3-Flash costs $0.15 and $0.50. That makes GLM-5.3-Flash about 89% cheaper for the same work.
How do you compare the two?
We use the 36 benchmark tests both models have published scores on. The verdict counts the 21 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 15 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.