Claude Opus 4.5 vs GLM-5.3-Flash
Wins 2 of 8 areas
Facts · Following instructions
Wins 6 of 8 areas
Coding · Agents · Reasoning · Images and charts · Math · Long documents
GLM-5.3-Flash is the stronger all-rounder.Claude Opus 4.5 is better at facts.
Scores updated · 33 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 thinking14GLM-5.3-Flash4 of 5 tests
- CodingWriting and fixing software13GLM-5.3-Flash3 of 5 tests · 1 tie
- AgentsCarrying out multi-step tasks on its own12GLM-5.3-Flash2 of 3 tests
- MathCompetition and research-level math12GLM-5.3-Flash2 of 3 tests
- Images and chartsUnderstanding pictures, charts and video01GLM-5.3-Flash1 of 1 test
- Long documentsFinding answers in very long texts01GLM-5.3-Flash1 of 1 test
- FactsGetting facts right instead of making them up21Claude Opus 4.52 of 3 tests
- Following instructionsDoing exactly what it is asked10Claude Opus 4.51 of 1 test
Images and charts, 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 98% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where GLM-5.3-Flash pulls ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+39points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+33.4points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+28.2points ahead
Where Claude Opus 4.5 pulls ahead
- Completes tasks by operating a computer desktopOSWorld-Verified+51.5points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+19.1points ahead
- Short factual questions, answered correctlySimpleQA Verified+13.7points ahead
Every test, side by side
All 33 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGLM-5.3-Flash
- LiveBench · Agentic CodingGLM-5.3-Flash by 17.139.756.8+17.1
- LMArena · WebDevGLM-5.3-Flash by 140 rating points14691609+140 rating
- LiveCodeBench v6Claude Opus 4.5 by 4.284.880.6+4.2
- SciCodeGLM-5.3-Flash by 2.149.551.6+2.1
- LiveBench · Codingtie79.779tie
AgentsGLM-5.3-Flash
- OSWorld-VerifiedClaude Opus 4.5 by 51.566.314.8+51.5
- BrowseCompGLM-5.3-Flash by 393776+39
- GDPValGLM-5.3-Flash by 9.947.357.2+9.9
ReasoningGLM-5.3-Flash
- ARC-AGI-2GLM-5.3-Flash by 28.237.665.8+28.2
- CritPtGLM-5.3-Flash by 10.84.615.4+10.8
- Humanity's Last ExamGLM-5.3-Flash by 9.830.139.9+9.8
- GPQA DiamondGLM-5.3-Flash by 4.686.691.2+4.6
- LiveBench · ReasoningClaude Opus 4.5 by 2.580.177.6+2.5
FactsClaude Opus 4.5
- AA-Omniscience · Non-hallucinationGLM-5.3-Flash by 33.43972.4+33.4
- AA-Omniscience · AccuracyClaude Opus 4.5 by 19.146.627.5+19.1
- SimpleQA VerifiedClaude Opus 4.5 by 13.745.732+13.7
Images and chartsGLM-5.3-Flash
- CharXiv (RQ)GLM-5.3-Flash by 22.267.289.4+22.2
MathGLM-5.3-Flash
- FrontierMath Tiers 1-3 (v2)GLM-5.3-Flash by 21.434.455.8+21.4
- FrontierMath Tier 4GLM-5.3-Flash by 12.24.917.1+12.2
- LiveBench · MathematicsClaude Opus 4.5 by 9.290.481.2+9.2
Following instructionsClaude Opus 4.5
- LiveBench · Instruction FollowingClaude Opus 4.5 by 9.862.552.8+9.8
Other results11 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.
- ToolathlonGLM-5.3-Flash by 34.943.578.4+34.9
- Artificial Analysis Coding IndexGLM-5.3-Flash by 23.747.871.5+23.7
- NL2RepoGLM-5.3-Flash by 13.143.256.3+13.1
- AA IntelligenceGLM-5.3-Flash by 12.729.141.8+12.7
- ARC-AGI-1GLM-5.3-Flash by 98291+9
- AA Agentic IndexClaude Opus 4.5 by 8.459.651.2+8.4
- DeepSearchQA (F1)GLM-5.3-Flash by 8.276.184.3+8.2
- AA-OmniscienceClaude Opus 4.5 by 6.5147.5+6.5
- livebench_languageClaude Opus 4.5 by 481.377.3+4
- MMVUGLM-5.3-Flash by 3.277.380.5+3.2
- livebench_data_analysisGLM-5.3-Flash by 274.476.4+2
Questions people ask
Which is better, Claude Opus 4.5 or GLM-5.3-Flash?
GLM-5.3-Flash wins six of the eight areas we test: coding, agents, reasoning, images and charts, math and long documents. Claude Opus 4.5 wins facts and following instructions.
Which is better for coding?
GLM-5.3-Flash. It wins 3 of the 5 coding tests both models report; Claude Opus 4.5 wins 1, and 1 is a tie.
Which is cheaper?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; GLM-5.3-Flash costs $0.15 and $0.50. That makes GLM-5.3-Flash about 98% cheaper for the same work.
How do you compare the two?
We use the 33 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 11 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.