# GLM-5.3 vs Ultramarine 1 Flash

> Side-by-side benchmark comparison for GLM-5.3 and Ultramarine 1 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/glm-5-3-vs-ultramarine-1-flash
- Last updated: October 15, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick GLM-5.3 if you want the stronger benchmark profile. Ultramarine 1 Flash only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GLM-5.3 leads overall 67.79 to 0.
- The biggest single benchmark swing is DeepSWE in Coding, with scores of 66.9% and 61.5%.
- GLM-5.3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GLM-5.3 also has the larger context window at 1M.

## Model Snapshot

| Property | GLM-5.3 | Ultramarine 1 Flash |
|----------|----------|----------|
| Creator | Z.AI | Paper Instruments |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | Not disclosed |
| Overall Score | 67.79 | null |
| Benchmarks Covered | 28 | 5 |
| Pricing (input/output) | $0.00 / $0.00 | $0.15 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- GLM-5.3 public-lane score: 70.2 (Supported · #8/126)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | GLM-5.3 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.2% | 83.2% | GLM-5.3 |
| terminalBench3 | 28.3% | Coming soon | Coming soon |
| CyberGym | 84.5% | Coming soon | Coming soon |
| ExploitGym | 15.0% | Coming soon | Coming soon |
| Toolathlon-Verified | 73.0% | Coming soon | Coming soon |
| AutomationBench | 48.2% | 50.2% | Ultramarine 1 Flash |
| 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% | Coming soon | Coming soon |
| JobBench | Coming soon | 62.9% | Coming soon |

### Coding

- Winner: Not comparable
- GLM-5.3 public-lane score: 56.4 (Supported · #28/149)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | GLM-5.3 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.2% | 83.2% | GLM-5.3 |
| terminalBench3 | 28.3% | Coming soon | Coming soon |
| DeepSWE | 66.9% | 61.5% | GLM-5.3 |
| 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% | Coming soon | Coming soon |
| OpenHarmony Bench | 60.8% | Coming soon | Coming soon |
| FrontierSWE v2 | 30.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 80.5% | Coming soon | Coming soon |
| SWE-bench (Vals) | 95.4% | Coming soon | Coming soon |
| Bug Hunt Bench | 19.0 fixes | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- GLM-5.3 public-lane score: 80.6 (#13/29)
- Ultramarine 1 Flash public-lane score: Coming soon

### Knowledge

- Winner: Not comparable
- GLM-5.3 public-lane score: 62.5 (Supported · #42/182)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | GLM-5.3 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 88.1% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.8% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- GLM-5.3 public-lane score: Coming soon
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | GLM-5.3 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 31.5% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- GLM-5.3 public-lane score: 71.5 (Unranked · 2 rankable rows)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | GLM-5.3 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 68.772% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 29.268% | Coming soon | Coming soon |

## FAQ

### Which is better overall, GLM-5.3 or Ultramarine 1 Flash?

GLM-5.3 is ahead overall on BenchLM right now.

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

GLM-5.3 currently has 28 sourced benchmark scores on BenchLM.

### How many benchmarks does Ultramarine 1 Flash cover on BenchLM?

Ultramarine 1 Flash currently has 5 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GLM-5.3 vs GLM-5.2](/compare/glm-5-2-vs-glm-5-3)
- [Ultramarine 1 Flash vs GLM-5.2](/compare/glm-5-2-vs-ultramarine-1-flash)
- [GLM-5.3 vs GLM-5.3-Flash](/compare/glm-5-3-vs-glm-5-3-flash)
- [Ultramarine 1 Flash vs GLM-5.3-Flash](/compare/glm-5-3-flash-vs-ultramarine-1-flash)

## Explore More

- [GLM-5.3 profile](/models/glm-5-3)
- [Ultramarine 1 Flash profile](/models/ultramarine-1-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)