# Composer 2.5 vs Grok 4.5

> Side-by-side benchmark comparison for Composer 2.5 and Grok 4.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/composer-2-5-vs-grok-4-5
- Last updated: October 7, 2026

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

## Quick Verdict

Pick Grok 4.5 if you want the stronger benchmark profile. Composer 2.5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Grok 4.5 leads overall 63.97 to 61.
- The biggest single benchmark swing is CursorBench 3.2 in Coding, with scores of 56.1% and 66.7%.
- Composer 2.5 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Grok 4.5 also has the larger context window at 500K.

## Model Snapshot

| Property | Composer 2.5 | Grok 4.5 |
|----------|----------|----------|
| Creator | Cursor | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 200K | 500K |
| Overall Score | null | 63.97 |
| Benchmarks Covered | 8 | 17 |
| Pricing (input/output) | $0.50 / $2.50 | $2.00 / $6.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Composer 2.5 public-lane score: Coming soon
- Grok 4.5 public-lane score: 57.6 (Supported · #29/122)

| Benchmark | Composer 2.5 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 69.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 58.4% | 67.8% | Grok 4.5 |
| Terminal-Bench 3.0 | Coming soon | 15.7% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 83.3% | Coming soon |
| deepSwe | Coming soon | 53% | Coming soon |

### Coding

- Winner: Not comparable
- Composer 2.5 public-lane score: Coming soon
- Grok 4.5 public-lane score: 57.7 (Supported · #27/146)

| Benchmark | Composer 2.5 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 69.3% | Coming soon | Coming soon |
| SWE Multilingual | 79.8% | 78% | Composer 2.5 |
| cursorBench31 | 63.2% | Coming soon | Coming soon |
| CursorBench 3.2 | 56.1% | 66.7% | Grok 4.5 |
| SWE-bench (Vals) | 79.6% | 86.6% | Grok 4.5 |
| CursorBench 4.0 | 27.7% | Coming soon | Coming soon |
| SWE-bench Pro | Coming soon | 64.7% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 83.3% | Coming soon |
| VulcanBench v3 | Coming soon | 89.9% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 87.4% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 23.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- Composer 2.5 public-lane score: Coming soon
- Grok 4.5 public-lane score: 50.4 (#28/28)

| Benchmark | Composer 2.5 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 52.6% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.3% | Coming soon |
| ARC-AGI-1 | Coming soon | 85.67% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Composer 2.5 public-lane score: Coming soon
- Grok 4.5 public-lane score: 79.5 (Unranked · 1 rankable row)

### Knowledge

- Winner: Not comparable
- Composer 2.5 public-lane score: Coming soon
- Grok 4.5 public-lane score: 67 (Supported · #19/174)

| Benchmark | Composer 2.5 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | Coming soon | 92.9% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 89.2% | Coming soon |

## FAQ

### Which is better overall, Composer 2.5 or Grok 4.5?

Grok 4.5 is ahead overall on BenchLM right now.

### How many benchmarks does Composer 2.5 cover on BenchLM?

Composer 2.5 currently has 8 sourced benchmark scores on BenchLM.

### How many benchmarks does Grok 4.5 cover on BenchLM?

Grok 4.5 currently has 17 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Composer 2.5 vs Composer 2](/compare/composer-2-vs-composer-2-5)
- [Grok 4.5 vs Composer 2](/compare/composer-2-vs-grok-4-5)
- [Composer 2.5 vs Composer 2 Fast](/compare/composer-2-5-vs-composer-2-fast)
- [Grok 4.5 vs Composer 2 Fast](/compare/composer-2-fast-vs-grok-4-5)

## Explore More

- [Composer 2.5 profile](/models/composer-2-5)
- [Grok 4.5 profile](/models/grok-4-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)