Gemini 4 Hydrogen vs GPT-5.6 Terra

Gemini 4 Hydrogen leads GPT-5.6 Terra on coding, 77.9 to 63.5 on the Vibe Coding Index, and Gemini 4 Hydrogen costs 1.6x less per output token ($7.50 vs $12.00 per million). Updated November 14, 2026; 48 benchmarks have a result for both.

Replace Gemini 4 Hydrogen Replace GPT-5.6 Terra

Gemini 4 HydrogenGoogle

Coding: 77.9
Overall: 77.1
Output $/M: $7.50

GPT-5.6 TerraOpenAI

Coding: 63.5
Overall: 65.1
Output $/M: $12.00

vs boards won of 48 shared

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

Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 63.5 for GPT-5.6 Terra, though on 4 benchmarks against 6.

Pick GPT-5.6 Terra for a larger context window (1.05M against 1.05M tokens) and work measured by LiveBench coding or LiveBench reasoning, where it leads.

Model AGemini 4 HydrogenGoogle77.9/1004 independent benchmarksNo cost per solved task Model BGPT-5.6 TerraOpenAI63.5/1006 independent benchmarks$0.42 per solved task

48294

Shared results: 48
Gemini 4 Hydrogen only: 2
GPT-5.6 Terra only: 94
Like-for-like categories: 7 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.

Coding
Vibe Coding Index, six public coding benchmarks
Gemini 4 Hydrogen
Gemini 4 Hydrogen scores 77.9 against 63.5.
4 and 6 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only GPT-5.6 Terra has a AA Intelligence Index result, 32.3.
Directional only
Agentic work
AA Agentic Index
No call
Only GPT-5.6 Terra has a AA Agentic Index result, 43.2.
Directional only
Reasoning
GPQA Diamond
No call
Only GPT-5.6 Terra has a GPQA Diamond result, 90.9%.
Directional only
Knowledge
MMLU Pro
No call
Only GPT-5.6 Terra has a MMLU Pro result, 86.7%.
Directional only
Web design
Design Arena: websites
Gemini 4 Hydrogen
Gemini 4 Hydrogen leads, 1320 against 1260.
Same board, both measured
General
Vals Index
No call
Only Gemini 4 Hydrogen has a Vals Index result, 68.5%.
Directional only
Long documents
Listed context window
GPT-5.6 Terra
GPT-5.6 Terra takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 4 Hydrogen
Gemini 4 Hydrogen $0.0053, GPT-5.6 Terra $0.0080 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GPT-5.6 Terra has the number, $0.42.
Directional only

At a glance

Coding index: Gemini 4 Hydrogen 77.9 from 4 benchmarks, GPT-5.6 Terra 63.5 from 6 benchmarks.
Widest category: Agentic work, 16.9 points apart on average over 5 shared benchmarks.
Widest single gap: Terminal-Bench 4 (Vals AI): Gemini 4 Hydrogen 54.0% against GPT-5.6 Terra 22.7%, 41.7 points apart on a 0 to 100 scale.
Output price: Gemini 4 Hydrogen $7.50 against GPT-5.6 Terra $12.00 per million output tokens, 1.6x apart.
Context window: Gemini 4 Hydrogen 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
Category	Gemini 4 Hydrogen	GPT-5.6 Terra
Coding	10	1
Agentic work	5	0
Reasoning	5	1
Math	2	0
Knowledge	5	0
Web design	5	0
General	14	0
All shared boards	46	2

CodingLike-for-likeSix of these boards feed the Vibe Coding Index101

Coding benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
LiveBench coding	78.5%	84.2%	GPT-5.6 Terra
LMArena WebDev	1704	1520	Gemini 4 Hydrogen
AA Coding Index	Not measured	76.7	Only GPT-5.6 Terra measured
LiveCodeBench (Vals AI)	Not measured	85.9%	Only GPT-5.6 Terra measured
SWE-bench Verified (Vals AI)	Not measured	95.4%	Only GPT-5.6 Terra measured
Terminal-Bench 4 (Vals AI)	54.0%	22.7%	Gemini 4 Hydrogen
Vibe Code Bench (Vals AI)	87.8%	74.6%	Gemini 4 Hydrogen
Code migration (Vals AI)	Not measured	47.8%	Only GPT-5.6 Terra measured
ProgramBench (Vals AI)	Not measured	0.5%	Only GPT-5.6 Terra measured
IOI (Vals AI)	Not measured	87.6%	Only GPT-5.6 Terra measured
Terminal-Bench 2.1 (Vals AI)	Not measured	77.5%	Only GPT-5.6 Terra measured
Vibe Code Bench 1-100 (Vals AI)	Not measured	14.8%	Only GPT-5.6 Terra measured
SkillsBench (Vals AI)	Not measured	58.9%	Only GPT-5.6 Terra measured
CyberBench (Vals AI)	Not measured	72.1%	Only GPT-5.6 Terra measured
SciCode	Not measured	55.0%	Only GPT-5.6 Terra measured
Terminal-Bench Hard (Artificial Analysis run)	Not measured	62.9%	Only GPT-5.6 Terra measured
Terminal-Bench 4.0 (Artificial Analysis run)	54.0%	35.4%	Gemini 4 Hydrogen
FrontierCode 2.0	39.0%	23.9%	Gemini 4 Hydrogen
FrontierCode	Not measured	41.3%	Only GPT-5.6 Terra measured
WeirdML	Not measured	78.3%	Only GPT-5.6 Terra measured
MirrorCode	Not measured	41.1%	Only GPT-5.6 Terra measured
ALE-Bench	Not measured	1951.4	Only GPT-5.6 Terra measured
LMArena Text: coding	1516	1485	Gemini 4 Hydrogen
LMArena Text: software and IT	1513	1481	Gemini 4 Hydrogen
LMArena WebDev: React	1724	1511	Gemini 4 Hydrogen
LMArena WebDev: HTML	1743	1523	Gemini 4 Hydrogen
LMArena WebDev: from an image	Not measured	1539	Only GPT-5.6 Terra measured
SciCode	Not measured	10.8%	Only GPT-5.6 Terra measured
SWE-Bench Pro V2	Not measured	92.4%	Only GPT-5.6 Terra measured
GameBench 2	Not measured	53.5	Only GPT-5.6 Terra measured
Terminal-Bench 2.1	Not measured	78.4%	Only GPT-5.6 Terra measured
Terminal-Bench 3.0	Not measured	20.8%	Only GPT-5.6 Terra measured
Terminal-Bench 4.0	Not measured	21.5%	Only GPT-5.6 Terra measured
CursorBench 4.0	57.8%	41.3%	Gemini 4 Hydrogen
Neither model has a result on the other 18 boards here

IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared

Intelligence benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
AA Intelligence Index	Not measured	32.3	Only GPT-5.6 Terra measured
Epoch Capabilities Index	Not measured	160.7	Only GPT-5.6 Terra measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index50

Agentic work benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
AA Agentic Index	Not measured	43.2	Only GPT-5.6 Terra measured
Design Arena: agents building web apps	Not measured	1095	Only GPT-5.6 Terra measured
Design Arena: agents building full-stack apps	Not measured	1036	Only GPT-5.6 Terra measured
Design Arena: agents building mobile apps	Not measured	1097	Only GPT-5.6 Terra measured
Design Arena: agents building Android apps	Not measured	1057	Only GPT-5.6 Terra measured
Design Arena: agents building games	Not measured	1027	Only GPT-5.6 Terra measured
Design Arena: HTML slides	Not measured	999	Only GPT-5.6 Terra measured
Design Arena: PowerPoint slides	Not measured	1095	Only GPT-5.6 Terra measured
Design Arena: spreadsheets	Not measured	999	Only GPT-5.6 Terra measured
LiveBench research	86.8%	79.7%	Gemini 4 Hydrogen
LiveBench browser	77.1%	70.3%	Gemini 4 Hydrogen
LiveBench long agentic	61.8%	25.9%	Gemini 4 Hydrogen
SREBench (Vals AI)	Not measured	9.5%	Only GPT-5.6 Terra measured
Finance Agent (Vals AI)	Not measured	54.4%	Only GPT-5.6 Terra measured
Tax Agent Bench (Vals AI)	52.3%	30.0%	Gemini 4 Hydrogen
Legal Research Bench (Vals AI)	53.8%	41.4%	Gemini 4 Hydrogen
Harvey's Legal Agent Benchmark (Vals AI)	11.3%	Not measured	Only Gemini 4 Hydrogen measured
Excel Modeling Benchmark (Vals AI)	Not measured	66.2%	Only GPT-5.6 Terra measured
Terminal-Bench-Science (Vals AI)	Not measured	10.0%	Only GPT-5.6 Terra measured
τ²-Bench Telecom	Not measured	86.3%	Only GPT-5.6 Terra measured
APEX-Agents	Not measured	58.2%	Only GPT-5.6 Terra measured
BALROG	Not measured	53.2%	Only GPT-5.6 Terra measured
Vending-Bench 2	Not measured	$7,343	Only GPT-5.6 Terra measured
Neither model has a result on the other 21 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index51

Reasoning benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
GPQA Diamond	Not measured	90.9%	Only GPT-5.6 Terra measured
LiveBench reasoning	88.6%	90.6%	GPT-5.6 Terra
MMMU Pro (Vals AI)	Not measured	86.5%	Only GPT-5.6 Terra measured
GPQA Diamond (Artificial Analysis run)	Not measured	92.5%	Only GPT-5.6 Terra measured
Humanity's Last Exam (Artificial Analysis run)	Not measured	42.9%	Only GPT-5.6 Terra measured
HLE-Diamond (Artificial Analysis run)	58.8%	28.8%	Gemini 4 Hydrogen
CritPt v2, hard subset (Artificial Analysis run)	66.0%	50.5%	Gemini 4 Hydrogen
GPQA Diamond (Epoch AI run)	Not measured	93.3%	Only GPT-5.6 Terra measured
ARC-AGI	Not measured	96.5%	Only GPT-5.6 Terra measured
ARC-AGI-2	Not measured	83.9%	Only GPT-5.6 Terra measured
SimpleBench	Not measured	48.9%	Only GPT-5.6 Terra measured
Chess puzzles	Not measured	47.0%	Only GPT-5.6 Terra measured
Mystery game puzzles	Not measured	35.0%	Only GPT-5.6 Terra measured
LMArena Text: hard prompts	1520	1470	Gemini 4 Hydrogen
LMArena Text: expert	1558	1495	Gemini 4 Hydrogen
LMArena Text: hard prompts in English	1514	1465	Gemini 4 Hydrogen
LMArena Vision: diagrams	Not measured	1291	Only GPT-5.6 Terra measured
LMArena Vision: homework	Not measured	1308	Only GPT-5.6 Terra measured
Kagi LLM Benchmark	Not measured	51.3%	Only GPT-5.6 Terra measured
Neither model has a result on the other 7 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index20

Math benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
OTIS Mock AIME	Not measured	99.7%	Only GPT-5.6 Terra measured
FrontierMath, tiers 1 to 3	Not measured	86.0%	Only GPT-5.6 Terra measured
FrontierMath, tier 4	Not measured	70.7%	Only GPT-5.6 Terra measured
ProofBench	Not measured	74.0%	Only GPT-5.6 Terra measured
LMArena Text: math	1507	1462	Gemini 4 Hydrogen
LMArena Text: mathematical work	1534	1476	Gemini 4 Hydrogen
Neither model has a result on the other 8 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50

Knowledge benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
MMLU Pro	Not measured	86.7%	Only GPT-5.6 Terra measured
LegalBench (Vals AI)	Not measured	85.1%	Only GPT-5.6 Terra measured
CorpFin (Vals AI)	Not measured	65.3%	Only GPT-5.6 Terra measured
TaxEval (Vals AI)	Not measured	76.2%	Only GPT-5.6 Terra measured
MortgageTax (Vals AI)	Not measured	67.3%	Only GPT-5.6 Terra measured
MedCode (Vals AI)	Not measured	43.4%	Only GPT-5.6 Terra measured
AA-Omniscience	46.3	-9.3	Gemini 4 Hydrogen
SimpleQA Verified	Not measured	43.2%	Only GPT-5.6 Terra measured
LMArena Text: science	1519	1453	Gemini 4 Hydrogen
LMArena Text: medicine and healthcare	1488	1430	Gemini 4 Hydrogen
LMArena Text: legal and government	1532	1461	Gemini 4 Hydrogen
LMArena Text: business and finance	1486	1446	Gemini 4 Hydrogen
FACTS Benchmark Suite	Not measured	61.3%	Only GPT-5.6 Terra measured
Neither model has a result on the other 8 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index50

Web design benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
Design Arena: websites	1320	1260	Gemini 4 Hydrogen
Design Arena: UI components	Not measured	1250	Only GPT-5.6 Terra measured
Design Arena: game dev	1369	1220	Gemini 4 Hydrogen
Design Arena: data viz	Not measured	1236	Only GPT-5.6 Terra measured
Design Arena: 3D	1415	1109	Gemini 4 Hydrogen
Design Arena: all code categories	1333	1229	Gemini 4 Hydrogen
Design Arena: SVG	Not measured	1207	Only GPT-5.6 Terra measured
Design Arena: ASCII art	Not measured	1171	Only GPT-5.6 Terra measured
LiveBench design	77.3%	70.9%	Gemini 4 Hydrogen

GeneralLike-for-likePublic boards, shown as published, kept out of the index140

General benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
Vals Index	68.5%	Not measured	Only Gemini 4 Hydrogen measured
LiveBench data analysis	83.2%	79.3%	Gemini 4 Hydrogen
Public Benefits Bench (Vals AI)	Not measured	62.4%	Only GPT-5.6 Terra measured
SAGE (Vals AI)	Not measured	87.0%	Only GPT-5.6 Terra measured
MedScribe (Vals AI)	Not measured	82.9%	Only GPT-5.6 Terra measured
Vals Multimodal Index	Not measured	65.1%	Only GPT-5.6 Terra measured
IFBench	Not measured	71.2%	Only GPT-5.6 Terra measured
Long context reasoning (AA-LCR)	Not measured	83.0%	Only GPT-5.6 Terra measured
GDPval-AA	Not measured	1461	Only GPT-5.6 Terra measured
DTBench	Not measured	93.3%	Only GPT-5.6 Terra measured
LMCA	Not measured	54.9%	Only GPT-5.6 Terra measured
Surface Evolver Bench	Not measured	83.8%	Only GPT-5.6 Terra measured
Furniture assembly	Not measured	54.2%	Only GPT-5.6 Terra measured
LMArena Text	1502	1449	Gemini 4 Hydrogen
LMArena Text: instruction following	1519	1455	Gemini 4 Hydrogen
LMArena Text: creative writing	1509	1414	Gemini 4 Hydrogen
LMArena Vision	Not measured	1269	Only GPT-5.6 Terra measured
LMArena Text: English	1499	1448	Gemini 4 Hydrogen
LMArena Text: non-English	1495	1442	Gemini 4 Hydrogen
LMArena Text: Chinese	1631	1513	Gemini 4 Hydrogen
LMArena Text: German	Not measured	1461	Only GPT-5.6 Terra measured
LMArena Text: Japanese	Not measured	1445	Only GPT-5.6 Terra measured
LMArena Text: Korean	Not measured	1423	Only GPT-5.6 Terra measured
LMArena Text: French	1512	1470	Gemini 4 Hydrogen
LMArena Text: Spanish	1494	1449	Gemini 4 Hydrogen
LMArena Text: Russian	1492	1453	Gemini 4 Hydrogen
LMArena Text: Polish	Not measured	1443	Only GPT-5.6 Terra measured
LMArena Text: multi-turn	1485	1455	Gemini 4 Hydrogen
LMArena Text: longer queries	1524	1454	Gemini 4 Hydrogen
LMArena Text: writing and language	1500	1431	Gemini 4 Hydrogen
LMArena Text: entertainment and media	1503	1418	Gemini 4 Hydrogen
LMArena Vision: English	Not measured	1268	Only GPT-5.6 Terra measured
LMArena Vision: Chinese	Not measured	1326	Only GPT-5.6 Terra measured
LMArena Vision: reading text	Not measured	1277	Only GPT-5.6 Terra measured
LMArena Vision: humor	Not measured	1241	Only GPT-5.6 Terra measured
LMArena Vision: creative writing	Not measured	1245	Only GPT-5.6 Terra measured
LMArena Document	Not measured	1468	Only GPT-5.6 Terra measured
EQ-Bench 4	Not measured	1220	Only GPT-5.6 Terra measured
Neither model has a result on the other 11 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Gemini 4 Hydrogen and GPT-5.6 Terra
Benchmark	Gemini 4 Hydrogen	GPT-5.6 Terra	Leader
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 Hydrogen$0.0053Fits in one request

GPT-5.6 Terra$0.0080Fits in one request

Gemini 4 Hydrogen costs less

Repository review

50K input + 3K output tokens

Gemini 4 Hydrogen$0.098Fits in one request

GPT-5.6 Terra$0.136Fits in one request

Gemini 4 Hydrogen costs less

Agent loop

200K input + 10K output tokens

Gemini 4 Hydrogen$0.375Fits in one request

GPT-5.6 Terra$0.520Fits in one request

Gemini 4 Hydrogen 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 Hydrogen and GPT-5.6 Terra
Specification	Google Gemini 4 Hydrogen	OpenAI GPT-5.6 Terra
Maker	Google	OpenAI
Weights	No public weights listed	No public weights listed
Released	November 12, 2026	July 9, 2026
Context window	1.05M	1.05M
Input $/Mtok	$1.50	$2.00
Output $/Mtok	$7.50	$12.00
Coding index	77.9	63.5
Independent measurements behind it	4	6
Cost per solved task	Not computable	$0.42
Source	OpenRouter listing	OpenRouter listing

Questions

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

Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 63.5 for GPT-5.6 Terra, though on 4 benchmarks against 6. Pick GPT-5.6 Terra for a larger context window (1.05M against 1.05M tokens) and work measured by LiveBench coding or LiveBench reasoning, where it leads.

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

Gemini 4 Hydrogen costs $1.50 per million input tokens and $7.50 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 Hydrogen or GPT-5.6 Terra?

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

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

48 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Hydrogen's coding index rests on 4 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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Gemini 4 Hydrogen or GPT-5.6 Terra: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Knowledge

Web design

General

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next