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Gemini 4 Argon vs GPT-5.6 Terra

Gemini 4 Argon leads GPT-5.6 Terra on coding, 81.0 to 63.9 on the Vibe Coding Index, and Gemini 4 Argon costs 1.2x less per output token ($10.00 vs $12.00 per million). Updated October 22, 2026; 81 benchmarks have a result for both.

Replace Gemini 4 Argon Replace GPT-5.6 Terra
Gemini 4 ArgonGoogle
Coding
81.0
Overall
84.0
Output $/M
$10.00
77
GPT-5.6 TerraOpenAI
Coding
63.9
Overall
68.1
Output $/M
$12.00
3
vs boards won of 81 shared, 1 tied

Gemini 4 Argon or GPT-5.6 Terra: which to pick

Pick Gemini 4 Argon for coding: it scores 81.0 on the Vibe Coding Index against 63.9 for GPT-5.6 Terra, though on 5 benchmarks against 6.

Pick GPT-5.6 Terra for a larger context window (1.05M against 1.05M tokens) and work measured by Terminal-Bench 2.1 (Vals AI) or LiveBench design, where it leads.

Model AGemini 4 ArgonGoogle81.0/1005 independent benchmarksNo cost per solved taskModel BGPT-5.6 TerraOpenAI63.9/1006 independent benchmarks$0.42 per solved task
Shared results
81
Gemini 4 Argon only
13
GPT-5.6 Terra only
46
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Gemini 4 Argon 81.0 from 5 benchmarks, GPT-5.6 Terra 63.9 from 6 benchmarks.
Widest category
Agentic work, 21.2 points apart on average over 11 shared benchmarks.
Widest single gap
Terminal-Bench 4 (Vals AI): Gemini 4 Argon 57.6% against GPT-5.6 Terra 22.7%, 46.5 points apart on a 0 to 100 scale.
Output price
Gemini 4 Argon $10.00 against GPT-5.6 Terra $12.00 per million output tokens, 1.2x apart.
Context window
Gemini 4 Argon takes 1.05M tokens, GPT-5.6 Terra 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGemini 4 ArgonBarsGPT-5.6 TerraTies
Coding171
Intelligence20
Agentic work110
Reasoning100
Math501 tie
Knowledge70
Web design61
General191
All shared boards7731 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index171
Coding benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
LiveBench coding89.7%86.2%Gemini 4 Argon
LMArena WebDev16781522Gemini 4 Argon
AA Coding IndexNot measured76.7Only GPT-5.6 Terra measured
LiveCodeBench (Vals AI)Not measured85.9%Only GPT-5.6 Terra measured
SWE-bench Verified (Vals AI)Not measured95.4%Only GPT-5.6 Terra measured
Terminal-Bench 4 (Vals AI)57.6%22.7%Gemini 4 Argon
Vibe Code Bench (Vals AI)91.9%74.6%Gemini 4 Argon
Code migration (Vals AI)68.2%47.8%Gemini 4 Argon
ProgramBench (Vals AI)2.5%0.5%Gemini 4 Argon
IOI (Vals AI)100.0%87.6%Gemini 4 Argon
Terminal-Bench 2.1 (Vals AI)57.7%77.5%GPT-5.6 Terra
SWE-bench Multimodal (Vals AI)56.0%Not measuredOnly Gemini 4 Argon measured
Vibe Code Bench 1-100 (Vals AI)21.2%14.8%Gemini 4 Argon
SkillsBench (Vals AI)Not measured58.9%Only GPT-5.6 Terra measured
CyberBench (Vals AI)77.9%72.1%Gemini 4 Argon
SciCode61.8%55.0%Gemini 4 Argon
Terminal-Bench Hard (Artificial Analysis run)Not measured62.9%Only GPT-5.6 Terra measured
FrontierCode47.5%41.3%Gemini 4 Argon
FrontierSWE55.0%Not measuredOnly Gemini 4 Argon measured
WeirdMLNot measured78.3%Only GPT-5.6 Terra measured
MirrorCode58.9%Not measuredOnly Gemini 4 Argon measured
ALE-Bench2100.11951.4Gemini 4 Argon
LMArena Text: coding15461485Gemini 4 Argon
LMArena Text: software and IT15561482Gemini 4 Argon
LMArena WebDev: React16921513Gemini 4 Argon
LMArena WebDev: HTML16431526Gemini 4 Argon
LMArena WebDev: from an imageNot measured1541Only GPT-5.6 Terra measured
SciCode12.3%10.8%Gemini 4 Argon
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
AA Intelligence Index52.642.1Gemini 4 Argon
Epoch Capabilities Index166.4160.1Gemini 4 Argon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index110
Agentic work benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
AA Agentic IndexNot measured43.2Only GPT-5.6 Terra measured
Design Arena: agents building web appsNot measured1120Only GPT-5.6 Terra measured
Design Arena: agents building full-stack appsNot measured1061Only GPT-5.6 Terra measured
Design Arena: agents building mobile appsNot measured1111Only GPT-5.6 Terra measured
Design Arena: agents building Android appsNot measured1062Only GPT-5.6 Terra measured
Design Arena: agents building gamesNot measured1083Only GPT-5.6 Terra measured
Design Arena: HTML slidesNot measured1058Only GPT-5.6 Terra measured
Design Arena: PowerPoint slidesNot measured1105Only GPT-5.6 Terra measured
Design Arena: spreadsheets1157Not measuredOnly Gemini 4 Argon measured
LiveBench research83.1%60.4%Gemini 4 Argon
LiveBench browser92.0%84.0%Gemini 4 Argon
LiveBench long agentic69.9%48.4%Gemini 4 Argon
SREBench (Vals AI)44.3%9.5%Gemini 4 Argon
Finance Agent (Vals AI)65.4%54.4%Gemini 4 Argon
Tax Agent Bench (Vals AI)44.6%30.0%Gemini 4 Argon
Legal Research Bench (Vals AI)54.8%41.4%Gemini 4 Argon
Harvey's Legal Agent Benchmark (Vals AI)27.1%Not measuredOnly Gemini 4 Argon measured
Excel Modeling Benchmark (Vals AI)75.2%66.2%Gemini 4 Argon
BioMysteryBench (Vals AI)76.3%Not measuredOnly Gemini 4 Argon measured
Terminal-Bench-Science (Vals AI)44.3%10.0%Gemini 4 Argon
Vals Science Index55.4%Not measuredOnly Gemini 4 Argon measured
Time Horizon Index (Vals AI)52.5%Not measuredOnly Gemini 4 Argon measured
CUA-bench (Vals AI)4.8%Not measuredOnly Gemini 4 Argon measured
Robo-bench (Vals AI)0.8%Not measuredOnly Gemini 4 Argon measured
τ²-Bench TelecomNot measured86.3%Only GPT-5.6 Terra measured
APEX-Agents82.4%58.2%Gemini 4 Argon
BALROGNot measured53.2%Only GPT-5.6 Terra measured
Vending-Bench 2$13,718$7,343Gemini 4 Argon
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index100
Reasoning benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
GPQA DiamondNot measured90.9%Only GPT-5.6 Terra measured
LiveBench reasoning95.1%90.6%Gemini 4 Argon
MysteryMechanism (Vals AI)45.5%Not measuredOnly Gemini 4 Argon measured
MMMU Pro (Vals AI)Not measured86.5%Only GPT-5.6 Terra measured
GPQA Diamond (Artificial Analysis run)Not measured92.5%Only GPT-5.6 Terra measured
Humanity's Last Exam (Artificial Analysis run)57.1%42.9%Gemini 4 Argon
GPQA Diamond (Epoch AI run)96.4%93.3%Gemini 4 Argon
ARC-AGI98.5%96.5%Gemini 4 Argon
ARC-AGI-291.3%83.9%Gemini 4 Argon
SimpleBenchNot measured48.9%Only GPT-5.6 Terra measured
Chess puzzles59.0%47.0%Gemini 4 Argon
Mystery game puzzles64.0%35.0%Gemini 4 Argon
EBR-bench64.8%Not measuredOnly Gemini 4 Argon measured
LMArena Text: hard prompts15461469Gemini 4 Argon
LMArena Text: expert15501496Gemini 4 Argon
LMArena Text: hard prompts in English15481465Gemini 4 Argon
LMArena Vision: diagramsNot measured1295Only GPT-5.6 Terra measured
LMArena Vision: homeworkNot measured1312Only GPT-5.6 Terra measured
Kagi LLM BenchmarkNot measured51.3%Only GPT-5.6 Terra measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index50
Math benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
OTIS Mock AIME100.0%99.7%Gemini 4 Argon
FrontierMath, tiers 1 to 386.0%86.0%Tie
FrontierMath, tier 478.0%70.7%Gemini 4 Argon
ProofBench99.0%74.0%Gemini 4 Argon
LMArena Text: math15361465Gemini 4 Argon
LMArena Text: mathematical work15571478Gemini 4 Argon
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index70
Knowledge benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
MMLU ProNot measured86.7%Only GPT-5.6 Terra measured
LegalBench (Vals AI)88.3%85.1%Gemini 4 Argon
CorpFin (Vals AI)Not measured65.3%Only GPT-5.6 Terra measured
TaxEval (Vals AI)Not measured76.2%Only GPT-5.6 Terra measured
MortgageTax (Vals AI)Not measured67.3%Only GPT-5.6 Terra measured
MedCode (Vals AI)58.8%43.4%Gemini 4 Argon
SimpleQA Verified76.0%43.2%Gemini 4 Argon
LMArena Text: science15481452Gemini 4 Argon
LMArena Text: medicine and healthcare15551430Gemini 4 Argon
LMArena Text: legal and government15481461Gemini 4 Argon
LMArena Text: business and finance15251448Gemini 4 Argon
FACTS Benchmark SuiteNot measured52.0%Only GPT-5.6 Terra measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index61
Web design benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
Design Arena: websites13151268Gemini 4 Argon
Design Arena: UI components13331256Gemini 4 Argon
Design Arena: game dev13771229Gemini 4 Argon
Design Arena: data viz13321240Gemini 4 Argon
Design Arena: 3D13881134Gemini 4 Argon
Design Arena: all code categories13291241Gemini 4 Argon
Design Arena: SVGNot measured1219Only GPT-5.6 Terra measured
Design Arena: ASCII artNot measured1177Only GPT-5.6 Terra measured
LiveBench design73.7%76.0%GPT-5.6 Terra
GeneralLike-for-likePublic boards, shown as published, kept out of the index191
General benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
Vals Index69.2%Not measuredOnly Gemini 4 Argon measured
LiveBench data analysis85.2%79.3%Gemini 4 Argon
Public Benefits Bench (Vals AI)69.8%62.4%Gemini 4 Argon
SAGE (Vals AI)53.6%47.0%Gemini 4 Argon
MedScribe (Vals AI)87.4%82.9%Gemini 4 Argon
Vals Multimodal IndexNot measured65.1%Only GPT-5.6 Terra measured
IFBenchNot measured71.2%Only GPT-5.6 Terra measured
Long context reasoning (AA-LCR)79.7%83.0%GPT-5.6 Terra
DTBench97.6%93.3%Gemini 4 Argon
LMCA63.7%54.9%Gemini 4 Argon
Surface Evolver BenchNot measured83.8%Only GPT-5.6 Terra measured
Furniture assembly72.5%54.2%Gemini 4 Argon
LMArena Text15321448Gemini 4 Argon
LMArena Text: instruction following15341456Gemini 4 Argon
LMArena Text: creative writing15271413Gemini 4 Argon
LMArena VisionNot measured1271Only GPT-5.6 Terra measured
LMArena Text: English15381449Gemini 4 Argon
LMArena Text: non-English15221441Gemini 4 Argon
LMArena Text: Chinese16111514Gemini 4 Argon
LMArena Text: GermanNot measured1460Only GPT-5.6 Terra measured
LMArena Text: JapaneseNot measured1454Only GPT-5.6 Terra measured
LMArena Text: KoreanNot measured1427Only GPT-5.6 Terra measured
LMArena Text: FrenchNot measured1466Only GPT-5.6 Terra measured
LMArena Text: Spanish15031451Gemini 4 Argon
LMArena Text: Russian15341452Gemini 4 Argon
LMArena Text: PolishNot measured1446Only GPT-5.6 Terra measured
LMArena Text: multi-turn15561453Gemini 4 Argon
LMArena Text: longer queries15471454Gemini 4 Argon
LMArena Text: writing and language15291431Gemini 4 Argon
LMArena Text: entertainment and media15271418Gemini 4 Argon
LMArena Vision: EnglishNot measured1272Only GPT-5.6 Terra measured
LMArena Vision: ChineseNot measured1337Only GPT-5.6 Terra measured
LMArena Vision: reading textNot measured1278Only GPT-5.6 Terra measured
LMArena Vision: humorNot measured1236Only GPT-5.6 Terra measured
LMArena Vision: creative writingNot measured1248Only GPT-5.6 Terra measured
LMArena DocumentNot measured1472Only GPT-5.6 Terra measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 4 Argon and GPT-5.6 Terra
BenchmarkGemini 4 ArgonGPT-5.6 TerraLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 4 Argon$0.0070Fits in one request
GPT-5.6 Terra$0.0080Fits in one request

Gemini 4 Argon costs less

Repository review

50K input + 3K output tokens

Gemini 4 Argon$0.130Fits in one request
GPT-5.6 Terra$0.136Fits in one request

Gemini 4 Argon costs less

Agent loop

200K input + 10K output tokens

Gemini 4 Argon$0.500Fits in one request
GPT-5.6 Terra$0.520Fits in one request

Gemini 4 Argon costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 4 Argon and GPT-5.6 Terra
SpecificationGoogle Gemini 4 ArgonOpenAI GPT-5.6 Terra
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedOctober 13, 2026July 9, 2026
Context window1.05M1.05M
Input $/Mtok$2.00$2.00
Output $/Mtok$10.00$12.00
Coding index81.063.9
Independent measurements behind it56
Cost per solved taskNot computable$0.42
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 4 Argon better than GPT-5.6 Terra for coding?

Pick Gemini 4 Argon for coding: it scores 81.0 on the Vibe Coding Index against 63.9 for GPT-5.6 Terra, though on 5 benchmarks against 6. Pick GPT-5.6 Terra for a larger context window (1.05M against 1.05M tokens) and work measured by Terminal-Bench 2.1 (Vals AI) or LiveBench design, where it leads.

Which is cheaper, Gemini 4 Argon or GPT-5.6 Terra?

Gemini 4 Argon costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-5.6 Terra costs $2.00 and $12.00. Cost per solved task is known for GPT-5.6 Terra only.

Which has the bigger context window, Gemini 4 Argon or GPT-5.6 Terra?

GPT-5.6 Terra, with 1.05M tokens against 1.05M.

How many benchmarks is the Gemini 4 Argon vs GPT-5.6 Terra comparison based on?

81 benchmarks have a result for both models as of October 22, 2026. Gemini 4 Argon's coding index rests on 5 independent benchmarks and GPT-5.6 Terra's on 6. Where only one model has a result, the page says so instead of naming a winner.

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