Model comparison
GPT-5.4 Pro vs Grok 4.20
Head-to-head evidence from 3 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.4 Pro #44 (Estimated); Grok 4.20 #88 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.4 Pro and Grok 4.20 share 3 comparable benchmark results. 3 of 8 categories are comparable. 9 results are unique to GPT-5.4 Pro; 15 to Grok 4.20.
Updated July 23, 2026- Shared results
- 3
- GPT-5.4 Pro only
- 9
- Grok 4.20 only
- 15
- Comparable categories
- 3 / 8
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Grok 4.20 only becomes the better choice if you want the cheaper token bill or you need the larger 2M context window.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 3 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GPT-5.4 Pro is clearly ahead on the BenchAlign aggregate, 60.89 to 54.68. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 Pro's sharpest advantage is in agentic, where it averages 89.3 against 47.1. The single biggest benchmark swing on the page is ARC-AGI-2, 83.3% to 53.3%.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $2.00 input / $6.00 output per 1M tokens for Grok 4.20. That is roughly 30.0x on output cost alone. Grok 4.20 gives you the larger context window at 2M, compared with 1.05M for GPT-5.4 Pro.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GPT-5.4 Pro | Δ | Grok 4.20 |
|---|---|---|---|
| Agentic | GPT-5.4 Pro89.3 | Margin← 42.2 | Grok 4.2047.1 |
| Reasoning | GPT-5.4 Pro83.3 | Margin← 30.0 | Grok 4.2053.3 |
| Multimodal | GPT-5.4 Pro94.0 | Margin← 23.9 | Grok 4.2070.1 |
| Coding | GPT-5.4 ProNot measured | MarginNo overlap | Grok 4.2067.1 |
| Knowledge | GPT-5.4 Pro58.7 | MarginNo overlap | Grok 4.20Not measured |
| Math | GPT-5.4 Pro46.9 | MarginNo overlap | Grok 4.20Not measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
ARC-AGI-2
ReasoningA 83.3%B 53.3%Winner: GPT-5.4 ProΔ 30ARC-AGI-2: GPT-5.4 Pro scored 83.3%; Grok 4.20 scored 53.3%. GPT-5.4 Pro wins this benchmark. - Source ↗
MMMU-Pro
MultimodalA 94%B 75.2%Winner: GPT-5.4 ProΔ 18.8MMMU-Pro: GPT-5.4 Pro scored 94%; Grok 4.20 scored 75.2%. GPT-5.4 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.4 Pro | Grok 4.20 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.4 Pro$30 input / $180 output | Grok 4.20$2 input / $6 output | Grok 4.20 has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.4 Pro74 tok/s | Grok 4.20233 tok/s | Grok 4.20 has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5.4 Pro151.79 s | Grok 4.2010.33 s | Grok 4.20 reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5.4 Pro1.05M | Grok 4.202M | Grok 4.20 lists the larger context window. |
Benchmark Deep Dive
AgenticGPT-5.4 Pro wins4 benchmarks
Coding4 benchmarks
ReasoningGPT-5.4 Pro wins2 benchmarks
Knowledge7 benchmarks
| Benchmark | GPT-5.4 Pro | Grok 4.20 | Result |
|---|---|---|---|
| HLESource | 58.7% | — | Not comparable |
| FrontierScienceSource | 36.7% | — | Not comparable |
| FrontierScience ResearchSource | 36.7% | — | Not comparable |
| HLE w/o toolsSource | 42.7% | 31.6% | GPT-5.4 Pro leads |
| GPQA-DSource | — | 88.5% | Not comparable |
| HealthBench HardSource | — | 20.3% | Not comparable |
| MedXpertQA (Text)Source | — | 50.2% | Not comparable |
Math4 benchmarks
MultimodalGPT-5.4 Pro wins6 benchmarks
Frequently Asked Questions (4)
Which is better, GPT-5.4 Pro or Grok 4.20?
GPT-5.4 Pro is ahead on BenchLM's BenchAlign leaderboard, 60.89 to 54.68. The biggest single separator in this matchup is ARC-AGI-2, where the scores are 83.3% and 53.3%.
Which is better for reasoning, GPT-5.4 Pro or Grok 4.20?
GPT-5.4 Pro has the edge for reasoning in this comparison, averaging 83.3 versus 53.3. Inside this category, ARC-AGI-2 is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, GPT-5.4 Pro or Grok 4.20?
GPT-5.4 Pro has the edge for agentic tasks in this comparison, averaging 89.3 versus 47.1. Grok 4.20 stays close enough that the answer can still flip depending on your workload.
Which is better for multimodal and grounded tasks, GPT-5.4 Pro or Grok 4.20?
GPT-5.4 Pro has the edge for multimodal and grounded tasks in this comparison, averaging 94 versus 70.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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