# GPT-5.5 vs Grok 4.6

> Side-by-side benchmark comparison for GPT-5.5 and Grok 4.6 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-5-vs-grok-4-6
- Last updated: September 25, 2026

- Shared sourced benchmarks: 9
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Grok 4.6 if you want the stronger benchmark profile. GPT-5.5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Grok 4.6 leads overall 69.19 to 69.13.
- The clearest category separation is in reasoning, where the averages are 65.9 for GPT-5.5 and 57.6 for Grok 4.6.
- The biggest single benchmark swing is ARC-AGI-2 in Reasoning, with scores of 85% and 67.1%.
- Grok 4.6 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.5 also has the larger context window at 1M.

## Model Snapshot

| Property | GPT-5.5 | Grok 4.6 |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 500K |
| Overall Score | 69.13 | 69.19 |
| Benchmarks Covered | 39 | 17 |
| Pricing (input/output) | $5.00 / $30.00 | $2.00 / $6.00 |

## Category Breakdown

### Agentic

- Winner: Grok 4.6
- GPT-5.5 public-lane score: 60.1 (Supported · #15/105)
- Grok 4.6 public-lane score: 67.9 (Supported · #8/105)

| Benchmark | GPT-5.5 | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 82% | Coming soon | Coming soon |
| CyberGym | 81.8% | Coming soon | Coming soon |
| BrowseComp | 84.4% | Coming soon | Coming soon |
| OSWorld-Verified | 78.7% | Coming soon | Coming soon |
| MCP Atlas | 75.3% | Coming soon | Coming soon |
| Toolathlon | 55.6% | Coming soon | Coming soon |
| τ²-bench results | 98% | Coming soon | Coming soon |
| Gert Labs | 72.93% | Coming soon | Coming soon |
| ResearchClawBench | 17.0% | Coming soon | Coming soon |
| OSWorld 2.0 | 13.0% | Coming soon | Coming soon |
| JobBench | 42.7% | Coming soon | Coming soon |
| ExploitGym | 13.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 76.4% | 78.3% | Grok 4.6 |
| ApprenticeBench | 20% | 13% | GPT-5.5 |
| Terminal-Bench 3.0 | Coming soon | 26.5% | Coming soon |
| APEX-Agents | Coming soon | 57.5% | Coming soon |

### Coding

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 64.1 (Supported · #11/135)
- Grok 4.6 public-lane score: 62 (Supported · #14/135)

| Benchmark | GPT-5.5 | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 58.6% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 82.0% | Coming soon | Coming soon |
| Vibe Code Bench | 69.85% | Coming soon | Coming soon |
| React Native Evals | 84.7% | Coming soon | Coming soon |
| cursorBench31 | 59.2% | Coming soon | Coming soon |
| cursorBench32 | 58.4% | 70.8% | Grok 4.6 |
| FrontierCode 1.1 Main | 43.0% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.3% | 88.2% | Grok 4.6 |
| SWE-bench (Vals) | 82.6% | 95.6% | Grok 4.6 |
| Bug Hunt Bench | Coming soon | 27 fixes | Coming soon |
| DeepSWE | Coming soon | 65.9% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 61.3% | Coming soon |
| VulcanBench v3 | Coming soon | 87.0% | Coming soon |
| FrontierSWE v2 | Coming soon | 25.3% | Coming soon |

### Reasoning

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 65.9 (#10/19)
- Grok 4.6 public-lane score: 57.6 (#16/19)

| Benchmark | GPT-5.5 | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 64K-128K | 83.1% | Coming soon | Coming soon |
| MRCR v2 128K-256K | 87.5% | Coming soon | Coming soon |
| ARC-AGI-2 | 85% | 67.1% | GPT-5.5 |
| ARC-AGI-3 | 0.4% | 2.1% | Grok 4.6 |
| ARC-AGI-1 | Coming soon | 87.00% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.5 public-lane score: 71.4 (#20/50)
- Grok 4.6 public-lane score: Coming soon

| Benchmark | GPT-5.5 | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81.2% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 83.2% | Coming soon | Coming soon |
| OfficeQA Pro | 54.1% | Coming soon | Coming soon |

### Knowledge

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 70 (Supported · #12/158)
- Grok 4.6 public-lane score: 69 (Supported · #13/158)

| Benchmark | GPT-5.5 | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | Coming soon | Coming soon |
| GPQA-D | 93.6% | Coming soon | Coming soon |
| HLE | 52.2% | Coming soon | Coming soon |
| HLE w/o tools | 41.4% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 93.2% | 94.7% | Grok 4.6 |
| MMLU-Pro (Vals) | 88.1% | 89.4% | Grok 4.6 |

### Instruction Following

- Winner: Not comparable
- GPT-5.5 public-lane score: 91.9 (#7/124)
- Grok 4.6 public-lane score: Coming soon

### Mathematics

- Winner: Not comparable
- GPT-5.5 public-lane score: 69.4 (Unranked · 3 rankable rows)
- Grok 4.6 public-lane score: Coming soon

| Benchmark | GPT-5.5 | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 51.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 51.700% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 35.400% | Coming soon | Coming soon |

## FAQ

### Which is better overall, GPT-5.5 or Grok 4.6?

Grok 4.6 is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.5 and Grok 4.6?

The widest category gap is in reasoning, where the averages are 65.9 for GPT-5.5 and 57.6 for Grok 4.6.

### How many benchmarks does GPT-5.5 cover on BenchLM?

GPT-5.5 currently has 39 sourced benchmark scores on BenchLM.

### How many benchmarks does Grok 4.6 cover on BenchLM?

Grok 4.6 currently has 17 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.5 vs GPT-5.5 Pro](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Grok 4.6 vs GPT-5.5 Pro](/compare/gpt-5-5-pro-vs-grok-4-6)
- [GPT-5.5 vs GPT-6 Astra](/compare/gpt-5-5-vs-gpt-6-astra)
- [Grok 4.6 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-6)

## Explore More

- [GPT-5.5 profile](/models/gpt-5-5)
- [Grok 4.6 profile](/models/grok-4-6)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)