# GPT-5.4 nano vs Grok 4.20

> Side-by-side benchmark comparison for GPT-5.4 nano and Grok 4.20 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-4-nano-vs-grok-4-20-beta
- Last updated: September 10, 2026

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

## Quick Verdict

Pick Grok 4.20 if you want the stronger benchmark profile. GPT-5.4 nano only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Grok 4.20 leads overall 67.13 to 59.57.
- The clearest category separation is in reasoning, where the averages are 73.7 for GPT-5.4 nano and 34.2 for Grok 4.20.
- The biggest single benchmark swing is Vibe Code Bench in Coding, with scores of 26.10% and 4.06%.
- GPT-5.4 nano is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Grok 4.20 also has the larger context window at 2M.

## Model Snapshot

| Property | GPT-5.4 nano | Grok 4.20 |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 2M |
| Overall Score | 59.57 | 67.13 |
| Benchmarks Covered | 18 | 23 |
| Pricing (input/output) | $0.20 / $1.25 | $2.00 / $6.00 |

## Category Breakdown

### Agentic

- Winner: GPT-5.4 nano
- GPT-5.4 nano public-lane score: 34.6 (Supported · #133/152)
- Grok 4.20 public-lane score: 26.7 (Supported · #145/152)

| Benchmark | GPT-5.4 nano | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 46.3% | 47.1% | Grok 4.20 |
| OSWorld-Verified | 39% | Coming soon | Coming soon |
| MCP Atlas | 56.1% | Coming soon | Coming soon |
| Toolathlon | 35.5% | Coming soon | Coming soon |
| τ²-bench results | 92.5% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 41.6% | 44.2% | Grok 4.20 |
| DeepSearchQA | Coming soon | 62.8% | Coming soon |
| Gert Labs | Coming soon | 38.36% | Coming soon |

### Coding

- Winner: GPT-5.4 nano
- GPT-5.4 nano public-lane score: 37.1 (Supported · #126/151)
- Grok 4.20 public-lane score: 28.2 (Supported · #141/151)

| Benchmark | GPT-5.4 nano | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 26.10% | 4.06% | GPT-5.4 nano |
| LiveCodeBench (Vals) | 84.0% | 84.3% | Grok 4.20 |
| SWE-bench (Vals) | 69.8% | 72.2% | Grok 4.20 |
| LiveCodeBench Pro | Coming soon | 74.2% | Coming soon |
| SWE-bench Verified | Coming soon | 76.7% | Coming soon |
| SWE-bench Pro | Coming soon | 51.8% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- GPT-5.4 nano public-lane score: 23.8 (#45/48)
- Grok 4.20 public-lane score: 34.6 (#43/48)

| Benchmark | GPT-5.4 nano | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 66.1% | 75.2% | Grok 4.20 |
| MMMU-Pro w/ Python | 69.5% | Coming soon | Coming soon |
| CharXiv | Coming soon | 60.9% | Coming soon |
| ERQA | Coming soon | 54.1% | Coming soon |
| SimpleVQA | Coming soon | 57.4% | Coming soon |
| MedXpertQA (MM) | Coming soon | 65.8% | Coming soon |

### Reasoning

- Winner: Coming soon
- GPT-5.4 nano public-lane score: 73.7 (Unranked · 2 rankable rows)
- Grok 4.20 public-lane score: 34.2 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.4 nano | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 53.3% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.1% | Coming soon |

### Knowledge

- Winner: Grok 4.20
- GPT-5.4 nano public-lane score: 47.4 (Supported · #97/183)
- Grok 4.20 public-lane score: 49.4 (Supported · #85/183)

| Benchmark | GPT-5.4 nano | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 82.8% | Coming soon | Coming soon |
| HLE | 37.7% | Coming soon | Coming soon |
| HLE w/o tools | 24.3% | 31.6% | Grok 4.20 |
| GPQA Diamond (Vals) | 77.5% | 88.6% | Grok 4.20 |
| MMLU-Pro (Vals) | 77.2% | 86.3% | Grok 4.20 |
| GPQA-D | Coming soon | 88.5% | Coming soon |
| HealthBench Hard | Coming soon | 20.3% | Coming soon |
| MedXpertQA (Text) | Coming soon | 50.2% | Coming soon |

### Instruction Following

- Winner: Coming soon
- GPT-5.4 nano public-lane score: 93.2 (#9/123)
- Grok 4.20 public-lane score: Coming soon

### Mathematics

- Winner: Coming soon
- GPT-5.4 nano public-lane score: 43.9 (Unranked · 2 rankable rows)
- Grok 4.20 public-lane score: Coming soon

| Benchmark | GPT-5.4 nano | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 25.860% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 6.250% | Coming soon | Coming soon |

## FAQ

### Which is better overall, GPT-5.4 nano or Grok 4.20?

Grok 4.20 is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.4 nano and Grok 4.20?

The widest category gap is in reasoning, where the averages are 73.7 for GPT-5.4 nano and 34.2 for Grok 4.20.

### How many benchmarks does GPT-5.4 nano cover on BenchLM?

GPT-5.4 nano currently has 18 sourced benchmark scores on BenchLM.

### How many benchmarks does Grok 4.20 cover on BenchLM?

Grok 4.20 currently has 23 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.4 nano vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-4-nano)
- [Grok 4.20 vs GPT-5.4](/compare/gpt-5-4-vs-grok-4-20-beta)
- [GPT-5.4 nano vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-gpt-5-4-nano)
- [Grok 4.20 vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-grok-4-20-beta)

## Explore More

- [GPT-5.4 nano profile](/models/gpt-5-4-nano)
- [Grok 4.20 profile](/models/grok-4-20-beta)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)