# GLM-5.3-Flash vs GPT-6 Astra

> Side-by-side benchmark comparison for GLM-5.3-Flash and GPT-6 Astra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/glm-5-3-flash-vs-gpt-6-astra
- Last updated: October 17, 2026

- Shared sourced benchmarks: 12
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

GPT-6 Astra leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- GPT-6 Astra has the higher overall point estimate 83.88 to 58.52. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in mathematics, where the averages are 60.4 for GLM-5.3-Flash and 97.3 for GPT-6 Astra.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 17.073% and 97.600%.
- GLM-5.3-Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-6 Astra also has the larger context window at 1.05M.

## Model Snapshot

| Property | GLM-5.3-Flash | GPT-6 Astra |
|----------|----------|----------|
| Creator | Z.AI | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 58.52 | 83.88 |
| Benchmarks Covered | 26 | 40 |
| Pricing (input/output) | $0.00 / $0.00 | $10.00 / $50.00 |

## Category Breakdown

### Agentic

- Winner: GPT-6 Astra
- GLM-5.3-Flash public-lane score: 57.2 (Supported · #36/128)
- GPT-6 Astra public-lane score: 74.8 (Supported · #7/128)

| Benchmark | GLM-5.3-Flash | GPT-6 Astra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 84.3% | Coming soon | Coming soon |
| Toolathlon-Verified | 78.4% | Coming soon | Coming soon |
| AutomationBench | 48.8% | 41.4% | GLM-5.3-Flash |
| Agents' Last Exam | 26.3% | 59.3% | GPT-6 Astra |
| HLE w/ tools | 55.3% | 57.2% | GPT-6 Astra |
| Terminal-Bench 2.1 (Vals) | 62.9% | 87.3% | GPT-6 Astra |
| Hermes Index | 35.0% | 56.3% | GPT-6 Astra |
| Hermes Bench | 68.9% | 73.7% | GPT-6 Astra |
| MazeBench | 0% | 23% | GPT-6 Astra |
| BrowseComp | Coming soon | 91.5% | Coming soon |
| OSWorld 2.0 | Coming soon | 72.6% | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 57.90% | Coming soon |
| Terminal-Bench-Science 0.1 | Coming soon | 64.6% | Coming soon |
| ExploitGym | Coming soon | 42.4% | Coming soon |
| ApprenticeBench | Coming soon | 68% | Coming soon |
| CWE-bench v1 | Coming soon | 68.0% | Coming soon |

### Coding

- Winner: GPT-6 Astra
- GLM-5.3-Flash public-lane score: 48.3 (Supported · #46/150)
- GPT-6 Astra public-lane score: 75.5 (Supported · #4/150)

| Benchmark | GLM-5.3-Flash | GPT-6 Astra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 84.3% | Coming soon | Coming soon |
| DeepSWE | 63.4% | 74.1% | GPT-6 Astra |
| NL2Repo | 56.3% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 80.5% | Coming soon | Coming soon |
| SWE-bench (Vals) | 92.0% | Coming soon | Coming soon |
| OpenHarmony Bench | 57.3% | Coming soon | Coming soon |
| FrontierSWE v2 | 18.1% | 65.5% | GPT-6 Astra |
| Bug Hunt Bench | 17.7 fixes | 45.0 fixes | GPT-6 Astra |
| FrontierCode 1.1 Main | Coming soon | 53.3% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 64.5% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 44.3% | Coming soon |

### Reasoning

- Winner: Directional only
- GLM-5.3-Flash public-lane score: 80.8 (#12/28)
- GPT-6 Astra public-lane score: 93.3 (#1/28)

| Benchmark | GLM-5.3-Flash | GPT-6 Astra | Winner |
|-----------|-----------|-----------|--------|
| STEMBench | Coming soon | 2.81 | Coming soon |
| ARC-AGI-1 | Coming soon | 98.50% | Coming soon |
| ARC-AGI-2 | Coming soon | 95% | Coming soon |
| ARC-AGI-3 | Coming soon | 62.7% | Coming soon |
| GeneBench-Pro | Coming soon | 37.8% | Coming soon |
| MRCR v2 256K-512K | Coming soon | 100.0% | Coming soon |
| MRCR v2 512K-1M | Coming soon | 96.3% | Coming soon |
| GraphWalks BFS 256K–1M | Coming soon | 71.8% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GLM-5.3-Flash public-lane score: 84 (#14/54)
- GPT-6 Astra public-lane score: 87.3 (Unranked · 3 rankable rows)

| Benchmark | GLM-5.3-Flash | GPT-6 Astra | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 62.4% | Coming soon | Coming soon |
| CharXiv | 89.4% | Coming soon | Coming soon |
| Chartography (tools) | 78.0% | Coming soon | Coming soon |
| BabyVision | 53.4% | Coming soon | Coming soon |
| MMVU | 80.5% | Coming soon | Coming soon |
| ScreenSpot Pro | Coming soon | 92.7% | Coming soon |
| BenchCAD Vision2Code (tools) | Coming soon | 0.959 | Coming soon |

### Knowledge

- Winner: GPT-6 Astra
- GLM-5.3-Flash public-lane score: 60.6 (Supported · #48/184)
- GPT-6 Astra public-lane score: 86.2 (Supported · #3/184)

| Benchmark | GLM-5.3-Flash | GPT-6 Astra | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 86.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.1% | Coming soon | Coming soon |
| GPQA | Coming soon | 96% | Coming soon |
| GPQA-D | Coming soon | 96.0% | Coming soon |
| HealthBench (raw) | Coming soon | 56.9% | Coming soon |
| HealthBench (length-adjusted) | Coming soon | 58.3% | Coming soon |
| HealthBench Professional | Coming soon | 64.7% | Coming soon |
| HealthBench Professional (raw) | Coming soon | 68.2% | Coming soon |
| HealthBench Hard | Coming soon | 36.6% | Coming soon |

### Instruction Following

- Winner: Not comparable
- GLM-5.3-Flash public-lane score: Coming soon
- GPT-6 Astra public-lane score: Coming soon

| Benchmark | GLM-5.3-Flash | GPT-6 Astra | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | Coming soon | 8.5% | Coming soon |

### Mathematics

- Winner: Not comparable
- GLM-5.3-Flash public-lane score: 60.4 (Unranked · 2 rankable rows)
- GPT-6 Astra public-lane score: 97.3 (Unranked · 2 rankable rows)

| Benchmark | GLM-5.3-Flash | GPT-6 Astra | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 55.789% | 93.684% | GPT-6 Astra |
| FrontierMath v2 (Tier 4) | 17.073% | 97.600% | GPT-6 Astra |

## FAQ

### Which is better overall, GLM-5.3-Flash or GPT-6 Astra?

GPT-6 Astra has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between GLM-5.3-Flash and GPT-6 Astra?

The widest category gap is in mathematics, where the averages are 60.4 for GLM-5.3-Flash and 97.3 for GPT-6 Astra.

### How many benchmarks does GLM-5.3-Flash cover on BenchLM?

GLM-5.3-Flash currently has 26 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-6 Astra cover on BenchLM?

GPT-6 Astra currently has 40 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GLM-5.3-Flash vs GLM-5.3](/compare/glm-5-3-vs-glm-5-3-flash)
- [GPT-6 Astra vs GLM-5.3](/compare/glm-5-3-vs-gpt-6-astra)
- [GLM-5.3-Flash vs GLM-5.2](/compare/glm-5-2-vs-glm-5-3-flash)
- [GPT-6 Astra vs GLM-5.2](/compare/glm-5-2-vs-gpt-6-astra)

## Explore More

- [GLM-5.3-Flash profile](/models/glm-5-3-flash)
- [GPT-6 Astra profile](/models/gpt-6-astra)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)