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Model comparison

GPT-5.4 mini vs Grok 4.20

Data verified

Head-to-head evidence from 4 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

56.77/100
Margin
2.1pts
← winning
54.68/100
2 category wins0 category wins

Public leaderboard positions: GPT-5.4 mini #75 (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 mini and Grok 4.20 share 4 comparable benchmark results. 2 of 8 categories are comparable. 26 results are unique to GPT-5.4 mini; 14 to Grok 4.20.

Updated July 23, 2026
Shared results
4
GPT-5.4 mini only
26
Grok 4.20 only
14
Comparable categories
2 / 8

Pick GPT-5.4 mini if you want the stronger benchmark profile. Grok 4.20 only becomes the better choice if you need the larger 2M context window.

Confidence note. This is a partial-evidence comparison with 4 shared benchmark results across 4 evidence categories; 2 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 mini has the cleaner BenchAlign overall profile here, landing at 56.77 versus 54.68. It is a real lead, but still close enough that category-level strengths matter more than the headline number.

GPT-5.4 mini's sharpest advantage is in agentic, where it averages 65.7 against 47.1. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 60% to 47.1%.

Grok 4.20 is also the more expensive model on tokens at $2.00 input / $6.00 output per 1M tokens, versus $0.75 input / $4.50 output per 1M tokens for GPT-5.4 mini. Grok 4.20 gives you the larger context window at 2M, compared with 400K for GPT-5.4 mini.

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 scores and score margins for GPT-5.4 mini and Grok 4.20
CategoryGPT-5.4 miniΔGrok 4.20
AgenticGPT-5.4 mini65.7Margin← 18.6Grok 4.2047.1
MultimodalGPT-5.4 mini76.6Margin← 6.5Grok 4.2070.1
CodingGPT-5.4 miniNot measuredMarginNo overlapGrok 4.2067.1
ReasoningGPT-5.4 miniNot measuredMarginNo overlapGrok 4.2053.3
KnowledgeGPT-5.4 mini47.8MarginNo overlapGrok 4.20Not measured
MathGPT-5.4 mini21.7MarginNo overlapGrok 4.20Not measured

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · GPT-5.4 miniB · Grok 4.20

  1. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 60%B 47.1%
    Winner: GPT-5.4 miniΔ 12.9
    Terminal-Bench 2.0: GPT-5.4 mini scored 60%; Grok 4.20 scored 47.1%. GPT-5.4 mini wins this benchmark.

  2. MMMU-Pro

    Multimodal
    Source ↗
    A 76.6%B 75.2%
    Winner: GPT-5.4 miniΔ 1.4
    MMMU-Pro: GPT-5.4 mini scored 76.6%; Grok 4.20 scored 75.2%. GPT-5.4 mini wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricGPT-5.4 miniGrok 4.20Comparison
Input / output priceUSD per 1M tokensGPT-5.4 mini$0.75 input / $4.5 outputGrok 4.20$2 input / $6 outputGPT-5.4 mini has the lower combined listed price.
Generation speedtokens per secondGPT-5.4 mini201 tok/sGrok 4.20233 tok/sGrok 4.20 has the higher measured throughput.
First-answer latencyseconds to first tokenGPT-5.4 mini3.85 sGrok 4.2010.33 sGPT-5.4 mini reaches the first token sooner.
Context windowmaximum listed tokensGPT-5.4 mini400KGrok 4.202MGrok 4.20 lists the larger context window.

Benchmark Deep Dive

AgenticGPT-5.4 mini wins
BenchmarkGPT-5.4 miniGrok 4.20Result
Terminal-Bench 2.0Source 60%47.1%GPT-5.4 mini leads
OSWorld-VerifiedSource 72.1%—Not comparable
MCP AtlasSource 57.7%—Not comparable
ToolathlonSource 42.9%—Not comparable
τ²-bench resultsSource 83.3%—Not comparable
AA Agentic IndexSource 30.2%—Not comparable
APEX-Agents-AASource 28.2%—Not comparable
GDPval-AASource 33.6%—Not comparable
GDPval-AASource 1171—Not comparable
DeepSearchQASource —62.8%Not comparable
Gert LabsSource —38.36%Not comparable
Coding
BenchmarkGPT-5.4 miniGrok 4.20Result
Vibe Code BenchSource 47.97%4.06%GPT-5.4 mini leads
AA Coding IndexSource 56.1%—Not comparable
AA-SciCodeSource 49.9%—Not comparable
FrontierCode 1.1 MainSource 27.0%—Not comparable
LiveCodeBench ProSource —74.2%Not comparable
SWE-bench VerifiedSource —76.7%Not comparable
SWE-bench ProSource —51.8%Not comparable
Reasoning
BenchmarkGPT-5.4 miniGrok 4.20Result
AA-LCRSource 69.3%—Not comparable
CritPtSource 10.0%—Not comparable
ARC-AGI-2Source —53.3%Not comparable
Knowledge
BenchmarkGPT-5.4 miniGrok 4.20Result
GPQASource 88%—Not comparable
HLESource 41.5%—Not comparable
HLE w/o toolsSource 28.2%31.6%Grok 4.20 leads
Artificial Analysis Intelligence IndexSource 40.0%—Not comparable
AA-GPQA DiamondSource 87.5%—Not comparable
AA-HLESource 26.6%—Not comparable
AA-Omniscience IndexSource -18.7%—Not comparable
AA-Omniscience AccuracySource 37.5%—Not comparable
AA-Omniscience Hallucination RateSource 89.8%—Not comparable
GPQA-DSource —88.5%Not comparable
HealthBench HardSource —20.3%Not comparable
MedXpertQA (Text)Source —50.2%Not comparable
Math
BenchmarkGPT-5.4 miniGrok 4.20Result
FrontierMath v2 (Tiers 1-3)Source 28.280%—Not comparable
FrontierMath v2 (Tier 4)Source 2.080%—Not comparable
MultimodalGPT-5.4 mini wins
BenchmarkGPT-5.4 miniGrok 4.20Result
MMMU-ProSource 76.6%75.2%GPT-5.4 mini leads
MMMU-Pro w/ PythonSource 78%—Not comparable
AA-MMMU-ProSource 73.3%—Not comparable
CharXivSource —60.9%Not comparable
ERQASource —54.1%Not comparable
SimpleVQASource —57.4%Not comparable
MedXpertQA (MM)Source —65.8%Not comparable
Design Arena WebsiteSource —1257Not comparable
Inst. Following
BenchmarkGPT-5.4 miniGrok 4.20Result
AA-IFBenchSource 73.3%—Not comparable
Frequently Asked Questions (3)

Which is better, GPT-5.4 mini or Grok 4.20?

GPT-5.4 mini is ahead on BenchLM's BenchAlign leaderboard, 56.77 to 54.68. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 60% and 47.1%.

Which is better for agentic tasks, GPT-5.4 mini or Grok 4.20?

GPT-5.4 mini has the edge for agentic tasks in this comparison, averaging 65.7 versus 47.1. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, GPT-5.4 mini or Grok 4.20?

GPT-5.4 mini has the edge for multimodal and grounded tasks in this comparison, averaging 76.6 versus 70.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.

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