# Claude Sonnet 4.5 vs GLM-5.1

> Side-by-side benchmark comparison for Claude Sonnet 4.5 and GLM-5.1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-4-5-vs-glm-5-1
- Last updated: September 23, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.6

## Quick Verdict

Pick GLM-5.1 if you want the stronger benchmark profile. Claude Sonnet 4.5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GLM-5.1 leads overall 57.71 to 47.86.
- The clearest category separation is in reasoning, where the averages are 19.1 for Claude Sonnet 4.5 and 71.7 for GLM-5.1.
- The biggest single benchmark swing is FrontierMath v2 (Tiers 1-3) in Mathematics, with scores of 13.495% and 33.448%.
- GLM-5.1 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GLM-5.1 also has the larger context window at 203K.

## Model Snapshot

| Property | Claude Sonnet 4.5 | GLM-5.1 |
|----------|----------|----------|
| Creator | Anthropic | Z.AI |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 203K |
| Overall Score | 47.86 | 57.71 |
| Benchmarks Covered | 11 | 26 |
| Pricing (input/output) | $3.00 / $15.00 | $1.40 / $4.40 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Sonnet 4.5 public-lane score: 26.7 (Estimated · #75/105)
- GLM-5.1 public-lane score: 42.1 (Estimated · #43/105)

| Benchmark | Claude Sonnet 4.5 | GLM-5.1 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50% | 63.5% | GLM-5.1 |
| OSWorld-Verified | 61.4% | Coming soon | Coming soon |
| VITA-Bench | 17.0% | Coming soon | Coming soon |
| Gert Labs | 48.51% | 60.11% | GLM-5.1 |
| JobBench | 27.7% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 68% | Coming soon |
| τ³-bench results | Coming soon | 70.6% | Coming soon |
| MCP Atlas | Coming soon | 71.8% | Coming soon |
| CyberGym | Coming soon | 68.7% | Coming soon |
| Claw-Eval | Coming soon | 62.3% | Coming soon |
| ResearchClawBench | Coming soon | 18.2% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 56.9% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- GLM-5.1 public-lane score: 51.5 (Supported · #36/135)

| Benchmark | Claude Sonnet 4.5 | GLM-5.1 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 77.2% | Coming soon | Coming soon |
| SWE-bench Pro | Coming soon | 58.4% | Coming soon |
| NL2Repo | Coming soon | 42.7% | Coming soon |
| SWE-Rebench | Coming soon | 62.7% | Coming soon |
| Vibe Code Bench | Coming soon | 31.46% | Coming soon |
| OpenHarmony Bench | Coming soon | 52.3% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 81.4% | Coming soon |
| SWE-bench (Vals) | Coming soon | 76.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: 19.1 (Unranked · 1 rankable row)
- GLM-5.1 public-lane score: 71.7 (Unranked · 2 rankable rows)

| Benchmark | Claude Sonnet 4.5 | GLM-5.1 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 13.6% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- GLM-5.1 public-lane score: 50.2 (Supported · #54/160)

| Benchmark | Claude Sonnet 4.5 | GLM-5.1 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83.4% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 86.2% | Coming soon |
| HLE | Coming soon | 52.3% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 84.5% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 86.9% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- GLM-5.1 public-lane score: 92.4 (#4/124)

### Mathematics

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: 34.6 (Unranked · 2 rankable rows)
- GLM-5.1 public-lane score: 63.8 (#3/7)

| Benchmark | Claude Sonnet 4.5 | GLM-5.1 | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 87% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 13.495% | 33.448% | GLM-5.1 |
| FrontierMath v2 (Tier 4) | 4.167% | 12.500% | GLM-5.1 |
| AIME26 | Coming soon | 95.3% | Coming soon |
| HMMT Nov 2025 | Coming soon | 94.0% | Coming soon |
| HMMT Feb 2026 | Coming soon | 82.6% | Coming soon |
| MMAnswerBench | Coming soon | 83.8% | Coming soon |

## FAQ

### Which is better overall, Claude Sonnet 4.5 or GLM-5.1?

GLM-5.1 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Sonnet 4.5 and GLM-5.1?

The widest category gap is in reasoning, where the averages are 19.1 for Claude Sonnet 4.5 and 71.7 for GLM-5.1.

### How many benchmarks does Claude Sonnet 4.5 cover on BenchLM?

Claude Sonnet 4.5 currently has 11 sourced benchmark scores on BenchLM.

### How many benchmarks does GLM-5.1 cover on BenchLM?

GLM-5.1 currently has 26 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 4.5 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-vs-claude-sonnet-4-5-thinking)
- [GLM-5.1 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-thinking-vs-glm-5-1)
- [Claude Sonnet 4.5 vs GLM-5.3](/compare/claude-sonnet-4-5-vs-glm-5-3)
- [GLM-5.1 vs GLM-5.3](/compare/glm-5-1-vs-glm-5-3)

## Explore More

- [Claude Sonnet 4.5 profile](/models/claude-sonnet-4-5)
- [GLM-5.1 profile](/models/glm-5-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)