# GPT-5.4 Pro vs Grok 4.20 (Non-Reasoning)

> GPT-5.4 Pro is the stronger model overall, scoring 58.8 to 48.5 on the Noometry Index. Grok 4.20 (Non-Reasoning) costs 43× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-4-pro-vs-grok-4-20
- Last updated: 2026-10-10
- Shared benchmarks: 9

## Summary

- They share 9 benchmarks with published results for both. GPT-5.4 Pro scores higher in 4 categories and Grok 4.20 (Non-Reasoning) in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.4 Pro leads 72.0 to 48.0.
- The biggest single-benchmark swing is FrontierMath Tier 4: 58.5% for GPT-5.4 Pro and 17.1% for Grok 4.20 (Non-Reasoning).
- Grok 4.20 (Non-Reasoning) is cheaper at $1.25 / $2.50 per million input/output tokens, against $30 / $180 for GPT-5.4 Pro.
- GPT-5.4 Pro accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 58.8 | 48.5 |
| Rank | 16 | 48 |
| Context | 1.05M | 1M |
| Input $/M | $30 | $1.25 |
| Output $/M | $180 | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.4 Pro: 42.6 (#89)
- Grok 4.20 (Non-Reasoning): 41.8 (#104)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| WeirdML | 57.4% | 52.3% |
| LMArena WebDev | — | 1374 |
| LMArena Coding | — | 1458 |
| ALE-Bench | — | 1,150 |

## Agentic & Tool Use

- GPT-5.4 Pro: —
- Grok 4.20 (Non-Reasoning): 34.3 (#43)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Terminal-Bench | — | 57.3% |
| τ²-bench Banking | — | 18% |
| LMArena Search | — | 1189 |
| Vending-Bench 2 | — | 4,663 |

## Reasoning

- GPT-5.4 Pro: 71.0 (#10)
- Grok 4.20 (Non-Reasoning): 52.2 (#30)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| ARC-AGI-2 | 83.3% | 65.1% |
| ARC-AGI-1 | 94.5% | 89.5% |
| Chess Puzzles | 58.6% | 24% |
| Epoch Capabilities Index | 159.12 | 152.01 |
| SimpleBench | 74.1% | — |
| Kagi LLM Benchmark | — | 75% |
| NYT Connections (extended) | — | 85.4% |
| CritPt | 30% | — |
| EnigmaEval | 23.8% | — |
| Thematic Generalization | — | 63.8% |
| LMArena Hard Prompts | — | 1451 |
| DTBench | — | 90.1% |
| LMCA | — | 38.7% |
| ForecastBench | — | 61.4 |

## Math

- GPT-5.4 Pro: 72.0 (#17)
- Grok 4.20 (Non-Reasoning): 48.0 (#54)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | 44.9% |
| FrontierMath Tier 4 | 58.5% | 17.1% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| ProofBench | — | 14% |
| LMArena Math | — | 1455 |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |

## Knowledge

- GPT-5.4 Pro: 68.3 (#6)
- Grok 4.20 (Non-Reasoning): 52.8 (#54)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| GPQA Diamond | 94.6% | 89.3% |
| SimpleQA Verified | 46.3% | 30.2% |
| Humanity's Last Exam | 44.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
| LMArena Expert | — | 1440 |

## Multimodal

- GPT-5.4 Pro: —
- Grok 4.20 (Non-Reasoning): 33.2 (#88)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Vision | — | 1263 |
| Blueprint-Bench 2 | — | 0% |
| LMArena Document | — | 1416 |

## Multilingual

- GPT-5.4 Pro: —
- Grok 4.20 (Non-Reasoning): 54.7 (#38)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Non-English | — | 1440 |
| LMArena Chinese | — | 1481 |
| LMArena French | — | 1477 |
| LMArena German | — | 1463 |
| LMArena Japanese | — | 1450 |
| LMArena Korean | — | 1417 |
| LMArena Russian | — | 1457 |
| LMArena Spanish | — | 1442 |

## Instruction Following

- GPT-5.4 Pro: —
- Grok 4.20 (Non-Reasoning): 75.0 (#79)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Instruction Following | — | 1420 |

## Long Context

- GPT-5.4 Pro: —
- Grok 4.20 (Non-Reasoning): 45.4 (#33)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| CL-bench | — | 22.2% |
| CL-bench Life | — | 11.9% |
| LMArena Longer Query | — | 1436 |

## Writing & Preference

- GPT-5.4 Pro: —
- Grok 4.20 (Non-Reasoning): 65.9 (#42)

| Benchmark | GPT-5.4 Pro | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Text | — | 1451 |
| LMArena Creative Writing | — | 1439 |
| EQ-Bench Creative Writing | — | 1574 |
| LMArena Multi-Turn | — | 1456 |

## FAQ

### Is GPT-5.4 Pro better than Grok 4.20 (Non-Reasoning)?

GPT-5.4 Pro is the stronger model overall, scoring 58.8 to 48.5 on the Noometry Index. Grok 4.20 (Non-Reasoning) costs 43× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.4 Pro or Grok 4.20 (Non-Reasoning)?

Grok 4.20 (Non-Reasoning) is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; GPT-5.4 Pro lists at $30 and $180.

### Is GPT-5.4 Pro or Grok 4.20 (Non-Reasoning) better for coding?

They score almost the same on coding (42.6 vs 41.8); test both on your own repository before choosing.

### Which has the bigger context window?

GPT-5.4 Pro does, with 1.05M tokens against 1M.

### How many benchmarks do GPT-5.4 Pro and Grok 4.20 (Non-Reasoning) share?

9 benchmarks have published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and Grok 4.20 (Non-Reasoning) has 46.