# GLM-5.3 vs GPT-5.6 Terra

> Side-by-side benchmark comparison for GLM-5.3 and GPT-5.6 Terra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/glm-5-3-vs-gpt-5-6-terra
- Last updated: September 28, 2026

- Shared sourced benchmarks: 11
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick GPT-5.6 Terra if you want the stronger benchmark profile. GLM-5.3 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.6 Terra leads overall 72.58 to 65.44.
- The clearest category separation is in reasoning, where the averages are 77.1 for GLM-5.3 and 65.5 for GPT-5.6 Terra.
- The biggest single benchmark swing is VulcanBench v3 in Coding, with scores of 78.3% and 87.0%.
- GLM-5.3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.6 Terra also has the larger context window at 1.05M.

## Model Snapshot

| Property | GLM-5.3 | GPT-5.6 Terra |
|----------|----------|----------|
| Creator | Z.AI | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 65.44 | 72.58 |
| Benchmarks Covered | 24 | 33 |
| Pricing (input/output) | $0.00 / $0.00 | $2.00 / $12.00 |

## Category Breakdown

### Agentic

- Winner: GLM-5.3
- GLM-5.3 public-lane score: 67.4 (Supported · #9/117)
- GPT-5.6 Terra public-lane score: 59.3 (Supported · #21/117)

| Benchmark | GLM-5.3 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.2% | 87.4% | GLM-5.3 |
| terminalBench3 | 28.3% | Coming soon | Coming soon |
| CyberGym | 84.5% | 81.8% | GLM-5.3 |
| ExploitGym | 15.0% | 23.2% | GPT-5.6 Terra |
| Toolathlon-Verified | 73.0% | Coming soon | Coming soon |
| AutomationBench | 48.2% | Coming soon | Coming soon |
| Agents' Last Exam | 28.5% | Coming soon | Coming soon |
| HLE w/ tools | 62.5% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 71.5% | 77.5% | GPT-5.6 Terra |
| Terminal-Bench 3.0 | Coming soon | 20.8% | Coming soon |
| BrowseComp | Coming soon | 87.5% | Coming soon |
| OSWorld 2.0 | Coming soon | 50.2% | Coming soon |
| Toolathlon | Coming soon | 53.1% | Coming soon |
| ApprenticeBench | Coming soon | 16% | Coming soon |

### Coding

- Winner: GPT-5.6 Terra
- GLM-5.3 public-lane score: 56.8 (Supported · #24/142)
- GPT-5.6 Terra public-lane score: 64.3 (Supported · #9/142)

| Benchmark | GLM-5.3 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.2% | 87.4% | GLM-5.3 |
| terminalBench3 | 28.3% | Coming soon | Coming soon |
| DeepSWE | 66.9% | 69.6% | GPT-5.6 Terra |
| NL2Repo | 58% | Coming soon | Coming soon |
| ProgramBench | 19.0% | Coming soon | Coming soon |
| FrontierSWE | 78.1% | Coming soon | Coming soon |
| sweMarathon | 42.5% | Coming soon | Coming soon |
| PostTrain Bench | 39.8% | Coming soon | Coming soon |
| VulcanBench v3 | 78.3% | 87.0% | GPT-5.6 Terra |
| OpenHarmony Bench | 60.8% | Coming soon | Coming soon |
| FrontierSWE v2 | 30.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 80.5% | 85.9% | GPT-5.6 Terra |
| SWE-bench (Vals) | 95.4% | 95.4% | Tie |
| SWE-bench Pro | Coming soon | 63.4% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 55.8% | Coming soon |
| cursorBench32 | Coming soon | 64.9% | Coming soon |
| cursorBench40 | Coming soon | 41.3% | Coming soon |

### Reasoning

- Winner: Directional only
- GLM-5.3 public-lane score: 77.1 (#11/27)
- GPT-5.6 Terra public-lane score: 65.5 (#18/27)

| Benchmark | GLM-5.3 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 83.9% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.8% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GLM-5.3 public-lane score: Coming soon
- GPT-5.6 Terra public-lane score: 78.2 (#16/50)

| Benchmark | GLM-5.3 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 80.7% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 82% | Coming soon |

### Knowledge

- Winner: GPT-5.6 Terra
- GLM-5.3 public-lane score: 61.9 (Supported · #35/168)
- GPT-5.6 Terra public-lane score: 71.1 (Supported · #10/168)

| Benchmark | GLM-5.3 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 88.1% | 90.9% | GPT-5.6 Terra |
| MMLU-Pro (Vals) | 86.8% | 86.7% | GLM-5.3 |
| GPQA | Coming soon | 92.9% | Coming soon |
| GPQA-D | Coming soon | 92.9% | Coming soon |
| HLE-Verified | Coming soon | 51.1% | Coming soon |
| LABBench2 | Coming soon | 81.2% | Coming soon |
| HealthBench Professional | Coming soon | 57.7% | Coming soon |
| HealthBench Hard | Coming soon | 32.7% | Coming soon |

### Instruction Following

- Winner: Not comparable
- GLM-5.3 public-lane score: Coming soon
- GPT-5.6 Terra public-lane score: 85.7 (#35/124)

### Mathematics

- Winner: Not comparable
- GLM-5.3 public-lane score: Coming soon
- GPT-5.6 Terra public-lane score: 96.8 (Unranked · 3 rankable rows)

| Benchmark | GLM-5.3 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | Coming soon | 84.9% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 84.900% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 68.300% | Coming soon |

## FAQ

### Which is better overall, GLM-5.3 or GPT-5.6 Terra?

GPT-5.6 Terra is ahead overall on BenchLM right now.

### Where is the biggest gap between GLM-5.3 and GPT-5.6 Terra?

The widest category gap is in reasoning, where the averages are 77.1 for GLM-5.3 and 65.5 for GPT-5.6 Terra.

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

GLM-5.3 currently has 24 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-5.6 Terra cover on BenchLM?

GPT-5.6 Terra currently has 33 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GLM-5.3 vs GLM-5.2](/compare/glm-5-2-vs-glm-5-3)
- [GPT-5.6 Terra vs GLM-5.2](/compare/glm-5-2-vs-gpt-5-6-terra)
- [GLM-5.3 vs GLM-5.3-Flash](/compare/glm-5-3-vs-glm-5-3-flash)
- [GPT-5.6 Terra vs GLM-5.3-Flash](/compare/glm-5-3-flash-vs-gpt-5-6-terra)

## Explore More

- [GLM-5.3 profile](/models/glm-5-3)
- [GPT-5.6 Terra profile](/models/gpt-5-6-terra)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)