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Model comparison

GPT-5.4 vs GPT-5.6 Terra

Data verified

Head-to-head evidence from 31 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

GPT-5.4
OpenAI
74.24/100
Margin
1.7pts
← winning
72.57/100
0 category wins5 category wins

Public leaderboard positions: GPT-5.4 #8 (Supported); GPT-5.6 Terra #11 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. GPT-5.4 and GPT-5.6 Terra share 31 comparable benchmark results. 5 of 8 categories are comparable. 21 results are unique to GPT-5.4; 13 to GPT-5.6 Terra.

Updated July 23, 2026
Shared results
31
GPT-5.4 only
21
GPT-5.6 Terra only
13
Comparable categories
5 / 8

Pick GPT-5.4 if you want the stronger benchmark profile. GPT-5.6 Terra only becomes the better choice if mathematics is the priority.

Confidence note. This is a partial-evidence comparison with 31 shared benchmark results across 7 evidence categories; 5 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 has the cleaner BenchAlign overall profile here, landing at 74.24 versus 72.57. It is a real lead, but still close enough that category-level strengths matter more than the headline number.

GPT-5.4 gives you the larger context window at 1.05M, compared with 1M for GPT-5.6 Terra.

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 and GPT-5.6 Terra
CategoryGPT-5.4ΔGPT-5.6 Terra
MathGPT-5.442.5Margin→ 38.3GPT-5.6 Terra80.8
KnowledgeGPT-5.457.6Margin→ 35.3GPT-5.6 Terra92.9
AgenticGPT-5.477.2Margin→ 10.2GPT-5.6 Terra87.4
MultimodalGPT-5.473.2Margin→ 7.5GPT-5.6 Terra80.7
CodingGPT-5.457.7Margin→ 5.7GPT-5.6 Terra63.4

Decisive benchmark drivers

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

More
A · GPT-5.4B · GPT-5.6 Terra

  1. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 27.100%B 68.300%
    Winner: GPT-5.6 TerraΔ 41.2
    FrontierMath v2 (Tier 4): GPT-5.4 scored 27.100%; GPT-5.6 Terra scored 68.300%. GPT-5.6 Terra wins this benchmark.

  2. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 47.600%B 84.900%
    Winner: GPT-5.6 TerraΔ 37.3
    FrontierMath v2 (Tiers 1-3): GPT-5.4 scored 47.600%; GPT-5.6 Terra scored 84.900%. GPT-5.6 Terra wins this benchmark.

  3. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 75.1%B 87.4%
    Winner: GPT-5.6 TerraΔ 12.3
    Terminal-Bench 2.0: GPT-5.4 scored 75.1%; GPT-5.6 Terra scored 87.4%. GPT-5.6 Terra wins this benchmark.

  4. SWE-bench Pro

    Coding
    Source ↗
    A 57.7%B 63.4%
    Winner: GPT-5.6 TerraΔ 5.7
    SWE-bench Pro: GPT-5.4 scored 57.7%; GPT-5.6 Terra scored 63.4%. GPT-5.6 Terra wins this benchmark.

  5. BrowseComp

    Agentic
    Source ↗
    A 82.7%B 87.5%
    Winner: GPT-5.6 TerraΔ 4.8
    BrowseComp: GPT-5.4 scored 82.7%; GPT-5.6 Terra scored 87.5%. GPT-5.6 Terra wins this benchmark.

Operational comparison

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

MetricGPT-5.4GPT-5.6 TerraComparison
Input / output priceUSD per 1M tokensGPT-5.4$2.5 input / $15 outputGPT-5.6 Terra$2.5 input / $15 outputListed prices are equal.
Generation speedtokens per secondGPT-5.474 tok/sGPT-5.6 TerraNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenGPT-5.4151.79 sGPT-5.6 TerraNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensGPT-5.41.05MGPT-5.6 Terra1MGPT-5.4 lists the larger context window.

Benchmark Deep Dive

AgenticGPT-5.6 Terra wins
BenchmarkGPT-5.4GPT-5.6 TerraResult
Terminal-Bench 2.0Source 75.1%87.4%GPT-5.6 Terra leads
CyberGymSource 79.0%81.8%GPT-5.6 Terra leads
BrowseCompSource 82.7%87.5%GPT-5.6 Terra leads
OSWorld-VerifiedSource 75%—Not comparable
MCP AtlasSource 70.6%—Not comparable
ToolathlonSource 54.6%53.1%GPT-5.4 leads
τ²-bench resultsSource 87.1%86.3%GPT-5.4 leads
Claw-EvalSource 60.3%—Not comparable
DeepSearchQASource 73.6%—Not comparable
AA Agentic IndexSource 41.1%47.4%GPT-5.6 Terra leads
APEX-Agents-AASource 33.3%38.9%GPT-5.6 Terra leads
GDPval-AASource 44.7%54.1%GPT-5.6 Terra leads
GDPval-AASource 13951581GPT-5.6 Terra leads
Gert LabsSource 64.89%—Not comparable
ResearchClawBenchSource 15.3%—Not comparable
JobBenchSource 38.9%—Not comparable
ExploitGymSource 6.0%23.2%GPT-5.6 Terra leads
OSWorld 2.0Source —50.2%Not comparable
AA Harvey LABSource —85.2%Not comparable
AA ITBenchSource —51.0%Not comparable
AA Tau3 BankingSource —31.8%Not comparable
AA AutomationBenchSource —45.6%Not comparable
terminalBenchHardSource —57.6%Not comparable
aaTerminalBench21Source —88%Not comparable
CodingGPT-5.6 Terra wins
BenchmarkGPT-5.4GPT-5.6 TerraResult
LiveCodeBench ProSource 87.5%—Not comparable
SWE-bench ProSource 57.7%63.4%GPT-5.6 Terra leads
React Native EvalsSource 85.3%—Not comparable
Vibe Code BenchSource 67.42%—Not comparable
AA Coding IndexSource 71.0%76.7%GPT-5.6 Terra leads
AA-SciCodeSource 56.6%53.9%GPT-5.4 leads
Terminal-Bench 2.0Source —87.4%Not comparable
deepSweSource —69.6%Not comparable
FrontierCode 1.1 ExtendedSource —55.8%Not comparable
cursorBench32Source —64.9%Not comparable
Reasoning
BenchmarkGPT-5.4GPT-5.6 TerraResult
AA-LCRSource 74.0%74.0%Tie
CritPtSource 23.4%30.0%GPT-5.6 Terra leads
ARC-AGI-3Source —0.8%Not comparable
KnowledgeGPT-5.6 Terra wins
BenchmarkGPT-5.4GPT-5.6 TerraResult
GPQASource 92.8%92.9%GPT-5.6 Terra leads
HLESource 52.1%—Not comparable
HLE w/o toolsSource 39.8%—Not comparable
GPQA-DSource 92.8%92.9%GPT-5.6 Terra leads
HealthBench HardSource 40.1%32.7%GPT-5.4 leads
MedXpertQA (Text)Source 59.6%—Not comparable
Artificial Analysis Intelligence IndexSource 51.4%55.0%GPT-5.6 Terra leads
AA-GPQA DiamondSource 92.0%92.5%GPT-5.6 Terra leads
AA-HLESource 41.6%41.8%GPT-5.6 Terra leads
AA-Omniscience IndexSource 5.7%-0.2%GPT-5.4 leads
AA-Omniscience AccuracySource 50.0%45.9%GPT-5.4 leads
AA-Omniscience Hallucination RateSource 88.6%85.2%GPT-5.6 Terra leads
HealthBench ProfessionalSource 48.1%57.7%GPT-5.6 Terra leads
MathGPT-5.6 Terra wins
BenchmarkGPT-5.4GPT-5.6 TerraResult
FrontierMath v2 (Tiers 1-3)Source 47.600%84.900%GPT-5.6 Terra leads
FrontierMath v2 (Tier 4)Source 27.100%68.300%GPT-5.6 Terra leads
FrontierMath (legacy)Source —84.9%Not comparable
MultimodalGPT-5.6 Terra wins
BenchmarkGPT-5.4GPT-5.6 TerraResult
MMMU-ProSource 81.2%80.7%GPT-5.4 leads
OfficeQA ProSource 53.2%—Not comparable
MMMU-Pro w/ PythonSource 82.1%82%GPT-5.4 leads
CharXivSource 82.8%—Not comparable
ERQASource 65.4%—Not comparable
SimpleVQASource 61.1%—Not comparable
ScreenSpot ProSource 85.4%—Not comparable
ZeroBenchSource 41.0%—Not comparable
MedXpertQA (MM)Source 77.1%—Not comparable
AA-MMMU-ProSource 78.4%80.7%GPT-5.6 Terra leads
Design Arena WebsiteSource 1250—Not comparable
Inst. Following
BenchmarkGPT-5.4GPT-5.6 TerraResult
AA-IFBenchSource 73.9%71.2%GPT-5.4 leads
Frequently Asked Questions (6)

Which is better, GPT-5.4 or GPT-5.6 Terra?

GPT-5.4 is ahead on BenchLM's BenchAlign leaderboard, 74.24 to 72.57. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 27.100% and 68.300%.

Which is better for knowledge tasks, GPT-5.4 or GPT-5.6 Terra?

GPT-5.6 Terra has the edge for knowledge tasks in this comparison, averaging 92.9 versus 57.6. Inside this category, HealthBench Professional is the benchmark that creates the most daylight between them.

Which is better for coding, GPT-5.4 or GPT-5.6 Terra?

GPT-5.6 Terra has the edge for coding in this comparison, averaging 63.4 versus 57.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.

Which is better for math, GPT-5.4 or GPT-5.6 Terra?

GPT-5.6 Terra has the edge for math in this comparison, averaging 80.8 versus 42.5. 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 or GPT-5.6 Terra?

GPT-5.6 Terra has the edge for agentic tasks in this comparison, averaging 87.4 versus 77.2. 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 or GPT-5.6 Terra?

GPT-5.6 Terra has the edge for multimodal and grounded tasks in this comparison, averaging 80.7 versus 73.2. Inside this category, AA-MMMU-Pro is the benchmark that creates the most daylight between them.

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