# GLM-5.3-Flash vs Seed 2.1 Turbo

> Side-by-side benchmark comparison for GLM-5.3-Flash and Seed 2.1 Turbo across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/glm-5-3-flash-vs-seed-2-1-turbo
- Last updated: September 10, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick GLM-5.3-Flash if you want the stronger benchmark profile. Seed 2.1 Turbo only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GLM-5.3-Flash leads overall 65.99 to 0.
- The biggest single benchmark swing is Terminal-Bench 2.1 in Agentic, with scores of 84.3% and 67.6%.
- Seed 2.1 Turbo is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GLM-5.3-Flash also has the larger context window at 1M.

## Model Snapshot

| Property | GLM-5.3-Flash | Seed 2.1 Turbo |
|----------|----------|----------|
| Creator | Z.AI | ByteDance |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 256K |
| Overall Score | 65.99 | null |
| Benchmarks Covered | 19 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Coming soon
- GLM-5.3-Flash public-lane score: 60.1 (Supported · #21/152)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | GLM-5.3-Flash | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 84.3% | 67.6% | GLM-5.3-Flash |
| Toolathlon-Verified | 78.4% | Coming soon | Coming soon |
| AutomationBench | 48.8% | Coming soon | Coming soon |
| Agents' Last Exam | 26.3% | Coming soon | Coming soon |
| HLE w/ tools | 55.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 62.9% | Coming soon | Coming soon |

### Coding

- Winner: Coming soon
- GLM-5.3-Flash public-lane score: 58.1 (Supported · #28/151)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | GLM-5.3-Flash | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 84.3% | 67.6% | GLM-5.3-Flash |
| DeepSWE | 63.4% | Coming soon | Coming soon |
| NL2Repo | 56.3% | 43.7% | GLM-5.3-Flash |
| 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 |

### Multimodal & Grounded

- Winner: Coming soon
- GLM-5.3-Flash public-lane score: 80.5 (#10/48)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | GLM-5.3-Flash | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 62.4% | Coming soon | Coming soon |
| CharXiv | 89.4% | 82.5% | GLM-5.3-Flash |
| Chartography (tools) | 78.0% | Coming soon | Coming soon |
| BabyVision | 53.4% | 62.9% | Seed 2.1 Turbo |
| MMVU | 80.5% | Coming soon | Coming soon |
| MathVision | Coming soon | 90.1% | Coming soon |
| MMMU-Pro | Coming soon | 80.1% | Coming soon |
| ZeroBench | Coming soon | 11.0% | Coming soon |
| ERQA | Coming soon | 71.3% | Coming soon |
| Video-MME | Coming soon | 89.0% | Coming soon |

### Knowledge

- Winner: Coming soon
- GLM-5.3-Flash public-lane score: 66 (Supported · #22/183)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | GLM-5.3-Flash | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 86.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.1% | Coming soon | Coming soon |
| SuperGPQA | Coming soon | 67.4% | Coming soon |

## FAQ

### Which is better overall, GLM-5.3-Flash or Seed 2.1 Turbo?

GLM-5.3-Flash is ahead overall on BenchLM right now.

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

GLM-5.3-Flash currently has 19 sourced benchmark scores on BenchLM.

### How many benchmarks does Seed 2.1 Turbo cover on BenchLM?

Seed 2.1 Turbo currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GLM-5.3-Flash vs GLM-5.3](/compare/glm-5-3-vs-glm-5-3-flash)
- [Seed 2.1 Turbo vs GLM-5.3](/compare/glm-5-3-vs-seed-2-1-turbo)
- [GLM-5.3-Flash vs GLM-5.2](/compare/glm-5-2-vs-glm-5-3-flash)
- [Seed 2.1 Turbo vs GLM-5.2](/compare/glm-5-2-vs-seed-2-1-turbo)

## Explore More

- [GLM-5.3-Flash profile](/models/glm-5-3-flash)
- [Seed 2.1 Turbo profile](/models/seed-2-1-turbo)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)