GLM-5.3-Flash vs GPT-6 Astra
Wins 2 of 8 areas
Agents · Images and charts
Wins 5 of 8 areas
Coding · Reasoning · Facts · Math · Following instructions
GPT-6 Astra is the stronger all-rounder.GLM-5.3-Flash is cheaper and better at agents.
Scores updated · 40 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 thinking05GPT-6 Astra5 of 5 tests
- CodingWriting and fixing software04GPT-6 Astra4 of 5 tests · 1 tie
- MathCompetition and research-level math03GPT-6 Astra3 of 3 tests
- FactsGetting facts right instead of making them up12GPT-6 Astra2 of 3 tests
- Following instructionsDoing exactly what it is asked01GPT-6 Astra1 of 1 test
- AgentsCarrying out multi-step tasks on its own32GLM-5.3-Flash3 of 5 tests
- Images and chartsUnderstanding pictures, charts and video10GLM-5.3-Flash1 of 1 test
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
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 99% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where GPT-6 Astra pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+80.5points ahead
- Short factual questions, answered correctlySimpleQA Verified+43.6points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+37.9points ahead
Where GLM-5.3-Flash pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+23.7points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+5.8points ahead
- Real work tasks from 44 professionsGDPVal+3.6points ahead
Every test, side by side
All 40 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-6 Astra
- LMArena · WebDevGPT-6 Astra by 155 rating points16091764+155 rating
- SciCodeGPT-6 Astra by 4.951.656.5+4.9
- Terminal-Bench 2.1GPT-6 Astra by 4.184.388.4+4.1
- LiveBench · CodingGPT-6 Astra by 1.47980.4+1.4
- LiveBench · Agentic Codingtie56.857.3tie
AgentsGLM-5.3-Flash
- Terminal-Bench 4.0GPT-6 Astra by 26.332.859.1+26.3
- BrowseCompGPT-6 Astra by 15.57691.5+15.5
- τ-Bench V3 · BankingGLM-5.3-Flash by 5.847.241.4+5.8
- GDPValGLM-5.3-Flash by 3.657.253.6+3.6
- AA IT-Bench SREGLM-5.3-Flash by 2.651.248.6+2.6
ReasoningGPT-6 Astra
- ARC-AGI-2GPT-6 Astra by 29.265.895+29.2
- CritPtGPT-6 Astra by 16.315.431.7+16.3
- LiveBench · ReasoningGPT-6 Astra by 15.177.692.7+15.1
- Humanity's Last ExamGPT-6 Astra by 14.839.954.7+14.8
- GPQA DiamondGPT-6 Astra by 4.991.296.1+4.9
FactsGPT-6 Astra
- SimpleQA VerifiedGPT-6 Astra by 43.63275.6+43.6
- AA-Omniscience · AccuracyGPT-6 Astra by 35.127.562.6+35.1
- AA-Omniscience · Non-hallucinationGLM-5.3-Flash by 23.772.448.7+23.7
Images and chartsGLM-5.3-Flash
- LMArena · VisionGLM-5.3-Flash by 16 rating points12951279+16 rating
MathGPT-6 Astra
- FrontierMath Tier 4GPT-6 Astra by 80.517.197.6+80.5
- FrontierMath Tiers 1-3 (v2)GPT-6 Astra by 37.955.893.7+37.9
- LiveBench · MathematicsGPT-6 Astra by 15.681.296.8+15.6
Following instructionsGPT-6 Astra
- LiveBench · Instruction FollowingGPT-6 Astra by 22.852.875.6+22.8
Other results16 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.
- Terminal-Bench-Science 0.1GPT-6 Astra by 58.54.863.3+58.5
- CritPt v2 HardGPT-6 Astra by 4624.570.5+46
- HLE-DiamondGPT-6 Astra by 45.618.263.8+45.6
- AA-OmniscienceGPT-6 Astra by 35.97.543.4+35.9
- Agents' Last ExamGPT-6 Astra by 3326.359.3+33
- GDP (Surge AI)GPT-6 Astra by 15.615.431+15.6
- Vals IndexGPT-6 Astra by 12.250.963.1+12.2
- livebench_languageGPT-6 Astra by 12.177.389.4+12.1
- AA IntelligenceGPT-6 Astra by 10.941.852.7+10.9
- DeepSWE 1.1GPT-6 Astra by 10.763.474.1+10.7
- GDPval-AA 2.1GLM-5.3-Flash by 107 rating points16491542+107 rating
- livebench_data_analysisGPT-6 Astra by 6.676.483+6.6
- ARC-AGI-1GPT-6 Astra by 6.59197.5+6.5
- Artificial Analysis Coding IndexGPT-6 Astra by 5.471.576.9+5.4
- PostTrain Bench v1.2GPT-6 Astra by 5.136.841.9+5.1
- AA Agentic Indextie51.251.5tie
Questions people ask
Which is better, GLM-5.3-Flash or GPT-6 Astra?
GPT-6 Astra wins five of the eight areas we test: coding, reasoning, facts, math and following instructions. GLM-5.3-Flash wins agents and images and charts, and costs 99% less. They are level on long documents.
Which is better for coding?
GPT-6 Astra. It wins 4 of the 5 coding tests both models report; GLM-5.3-Flash wins none, and 1 is a tie.
Which is cheaper?
GLM-5.3-Flash costs $0.15 per million input tokens and $0.50 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. That makes GLM-5.3-Flash about 99% cheaper for the same work.
How do you compare the two?
We use the 40 benchmark tests both models have published scores on. The verdict counts the 24 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 16 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.