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Model comparison

GPT-5.4 mini vs GPT-5.4 nano

Data verified

Head-to-head evidence from 29 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

Sibling matchup inside the GPT-5.4 family.

56.77/100
Margin
10.0pts
winning →
66.79/100
4 category wins0 category wins

Public leaderboard positions: GPT-5.4 mini #75 (Estimated); GPT-5.4 nano #25 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. GPT-5.4 mini and GPT-5.4 nano share 29 comparable benchmark results. 4 of 8 categories are comparable. 1 result is unique to GPT-5.4 mini; 0 to GPT-5.4 nano.

Updated July 23, 2026
Shared results
29
GPT-5.4 mini only
1
GPT-5.4 nano only
0
Comparable categories
4 / 8

GPT-5.4 mini makes more sense if agentic is the priority, while GPT-5.4 nano is the cleaner fit if you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 29 shared benchmark results across 7 evidence categories; 4 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 and GPT-5.4 nano sit in the same GPT-5.4 family. This page is less about two unrelated model lineages and more about how the siblings trade off on benchmark shape, token costs, and practical limits like context window.

GPT-5.4 nano is clearly ahead on the BenchAlign aggregate, 66.79 to 56.77. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

GPT-5.4 mini is also the more expensive model on tokens at $0.75 input / $4.50 output per 1M tokens, versus $0.20 input / $1.25 output per 1M tokens for GPT-5.4 nano. That is roughly 3.6x on output cost alone.

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 GPT-5.4 nano
CategoryGPT-5.4 miniΔGPT-5.4 nano
AgenticGPT-5.4 mini65.7Margin← 22.8GPT-5.4 nano42.9
MultimodalGPT-5.4 mini76.6Margin← 10.5GPT-5.4 nano66.1
KnowledgeGPT-5.4 mini47.8Margin← 4.0GPT-5.4 nano43.8
MathGPT-5.4 mini21.7Margin← 0.7GPT-5.4 nano21.0

Decisive benchmark drivers

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

More
A · GPT-5.4 miniB · GPT-5.4 nano

  1. OSWorld-Verified

    Agentic
    Source ↗
    A 72.1%B 39%
    Winner: GPT-5.4 miniΔ 33.1
    OSWorld-Verified: GPT-5.4 mini scored 72.1%; GPT-5.4 nano scored 39%. GPT-5.4 mini wins this benchmark.

  2. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 60%B 46.3%
    Winner: GPT-5.4 miniΔ 13.7
    Terminal-Bench 2.0: GPT-5.4 mini scored 60%; GPT-5.4 nano scored 46.3%. GPT-5.4 mini wins this benchmark.

  3. MMMU-Pro

    Multimodal
    Source ↗
    A 76.6%B 66.1%
    Winner: GPT-5.4 miniΔ 10.5
    MMMU-Pro: GPT-5.4 mini scored 76.6%; GPT-5.4 nano scored 66.1%. GPT-5.4 mini wins this benchmark.

  4. GPQA

    Knowledge
    Source ↗
    A 88%B 82.8%
    Winner: GPT-5.4 miniΔ 5.2
    GPQA: GPT-5.4 mini scored 88%; GPT-5.4 nano scored 82.8%. GPT-5.4 mini wins this benchmark.

  5. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 2.080%B 6.250%
    Winner: GPT-5.4 nanoΔ 4.2
    FrontierMath v2 (Tier 4): GPT-5.4 mini scored 2.080%; GPT-5.4 nano scored 6.250%. GPT-5.4 nano wins this benchmark.

Operational comparison

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

MetricGPT-5.4 miniGPT-5.4 nanoComparison
Input / output priceUSD per 1M tokensGPT-5.4 mini$0.75 input / $4.5 outputGPT-5.4 nano$0.2 input / $1.25 outputGPT-5.4 nano has the lower combined listed price.
Generation speedtokens per secondGPT-5.4 mini201 tok/sGPT-5.4 nano191 tok/sGPT-5.4 mini has the higher measured throughput.
First-answer latencyseconds to first tokenGPT-5.4 mini3.85 sGPT-5.4 nano3.64 sGPT-5.4 nano reaches the first token sooner.
Context windowmaximum listed tokensGPT-5.4 mini400KGPT-5.4 nano400KListed context windows are equal.

Benchmark Deep Dive

AgenticGPT-5.4 mini wins
BenchmarkGPT-5.4 miniGPT-5.4 nanoResult
Terminal-Bench 2.0Source 60%46.3%GPT-5.4 mini leads
OSWorld-VerifiedSource 72.1%39%GPT-5.4 mini leads
MCP AtlasSource 57.7%56.1%GPT-5.4 mini leads
ToolathlonSource 42.9%35.5%GPT-5.4 mini leads
τ²-bench resultsSource 83.3%76%GPT-5.4 mini leads
AA Agentic IndexSource 30.2%27.5%GPT-5.4 mini leads
APEX-Agents-AASource 28.2%24.9%GPT-5.4 mini leads
GDPval-AASource 33.6%30.0%GPT-5.4 mini leads
GDPval-AASource 11711100GPT-5.4 mini leads
Coding
BenchmarkGPT-5.4 miniGPT-5.4 nanoResult
Vibe Code BenchSource 47.97%26.10%GPT-5.4 mini leads
AA Coding IndexSource 56.1%56.1%GPT-5.4 mini leads
AA-SciCodeSource 49.9%46.9%GPT-5.4 mini leads
FrontierCode 1.1 MainSource 27.0%—Not comparable
Reasoning
BenchmarkGPT-5.4 miniGPT-5.4 nanoResult
AA-LCRSource 69.3%66.0%GPT-5.4 mini leads
CritPtSource 10.0%9.3%GPT-5.4 mini leads
KnowledgeGPT-5.4 mini wins
BenchmarkGPT-5.4 miniGPT-5.4 nanoResult
GPQASource 88%82.8%GPT-5.4 mini leads
HLESource 41.5%37.7%GPT-5.4 mini leads
HLE w/o toolsSource 28.2%24.3%GPT-5.4 mini leads
Artificial Analysis Intelligence IndexSource 40.0%38.2%GPT-5.4 mini leads
AA-GPQA DiamondSource 87.5%81.7%GPT-5.4 mini leads
AA-HLESource 26.6%26.5%GPT-5.4 mini leads
AA-Omniscience IndexSource -18.7%-29.5%GPT-5.4 mini leads
AA-Omniscience AccuracySource 37.5%25.4%GPT-5.4 mini leads
AA-Omniscience Hallucination RateSource 89.8%73.6%GPT-5.4 nano leads
MathGPT-5.4 mini wins
BenchmarkGPT-5.4 miniGPT-5.4 nanoResult
FrontierMath v2 (Tiers 1-3)Source 28.280%25.860%GPT-5.4 mini leads
FrontierMath v2 (Tier 4)Source 2.080%6.250%GPT-5.4 nano leads
MultimodalGPT-5.4 mini wins
BenchmarkGPT-5.4 miniGPT-5.4 nanoResult
MMMU-ProSource 76.6%66.1%GPT-5.4 mini leads
MMMU-Pro w/ PythonSource 78%69.5%GPT-5.4 mini leads
AA-MMMU-ProSource 73.3%65.4%GPT-5.4 mini leads
Inst. Following
BenchmarkGPT-5.4 miniGPT-5.4 nanoResult
AA-IFBenchSource 73.3%75.9%GPT-5.4 nano leads
Frequently Asked Questions (5)

Which is better, GPT-5.4 mini or GPT-5.4 nano?

GPT-5.4 mini and GPT-5.4 nano are sibling variants in the GPT-5.4 family, so the right pick depends on whether you value the better benchmark line, cheaper tokens, or the larger context window. GPT-5.4 nano is ahead on BenchLM's BenchAlign leaderboard 66.79 to 56.77.

Which is better for knowledge tasks, GPT-5.4 mini or GPT-5.4 nano?

GPT-5.4 mini has the edge for knowledge tasks in this comparison, averaging 47.8 versus 43.8. Inside this category, AA-Omniscience Hallucination Rate is the benchmark that creates the most daylight between them.

Which is better for math, GPT-5.4 mini or GPT-5.4 nano?

GPT-5.4 mini has the edge for math in this comparison, averaging 21.7 versus 21. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.

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

GPT-5.4 mini has the edge for agentic tasks in this comparison, averaging 65.7 versus 42.9. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.

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

GPT-5.4 mini has the edge for multimodal and grounded tasks in this comparison, averaging 76.6 versus 66.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.

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