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Gemini 4 Hydrogen vs Kimi K3

Gemini 4 Hydrogen leads Kimi K3 on coding, 77.9 to 61.4 on the Vibe Coding Index, and Gemini 4 Hydrogen costs 2.0x less per output token ($7.50 vs $15.00 per million). Updated November 14, 2026; 49 benchmarks have a result for both.

Replace Gemini 4 Hydrogen Replace Kimi K3
Gemini 4 HydrogenGoogle
Coding
77.9
Overall
77.1
Output $/M
$7.50
43
Kimi K3Moonshot AI
Coding
61.4
Overall
61.2
Output $/M
$15.00
6
vs boards won of 49 shared

Gemini 4 Hydrogen or Kimi K3: which to pick

Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 61.4 for Kimi K3, though on 4 benchmarks against 6.

Pick Kimi K3 for work measured by Harvey's Legal Agent Benchmark (Vals AI) or LiveBench reasoning, where it leads.

Model AGemini 4 HydrogenGoogle77.9/1004 independent benchmarksNo cost per solved taskModel BKimi K3Moonshot AI61.4/1006 independent benchmarks$0.81 per solved task
Shared results
49
Gemini 4 Hydrogen only
1
Kimi K3 only
84
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.

At a glance

Coding index
Gemini 4 Hydrogen 77.9 from 4 benchmarks, Kimi K3 61.4 from 6 benchmarks.
Widest category
Coding, 15.8 points apart on average over 10 shared benchmarks.
Widest single gap
Terminal-Bench 4 (Vals AI): Gemini 4 Hydrogen 54.0% against Kimi K3 17.2%, 49.2 points apart on a 0 to 100 scale.
Output price
Gemini 4 Hydrogen $7.50 against Kimi K3 $15.00 per million output tokens, 2.0x apart.
Context window
Both take 1.05M tokens.

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 HydrogenBarsKimi K3Ties
Coding100
Agentic work51
Reasoning51
Math20
Knowledge41
Web design32
General141
All shared boards436
CodingLike-for-likeSix of these boards feed the Vibe Coding Index100
Coding benchmarks for Gemini 4 Hydrogen and Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
LiveBench coding78.5%53.1%Gemini 4 Hydrogen
LMArena WebDev17041658Gemini 4 Hydrogen
AA Coding IndexNot measured72.0Only Kimi K3 measured
LiveCodeBench (Vals AI)Not measured87.2%Only Kimi K3 measured
SWE-bench Verified (Vals AI)Not measured93.4%Only Kimi K3 measured
Terminal-Bench 4 (Vals AI)54.0%17.2%Gemini 4 Hydrogen
Vibe Code Bench (Vals AI)87.8%85.0%Gemini 4 Hydrogen
Code migration (Vals AI)Not measured16.1%Only Kimi K3 measured
ProgramBench (Vals AI)Not measured2.0%Only Kimi K3 measured
IOI (Vals AI)Not measured48.9%Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)Not measured80.9%Only Kimi K3 measured
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
CyberBench (Vals AI)Not measured75.2%Only Kimi K3 measured
SciCodeNot measured59.5%Only Kimi K3 measured
Terminal-Bench 4.0 (Artificial Analysis run)54.0%12.6%Gemini 4 Hydrogen
FrontierCode 2.039.0%10.9%Gemini 4 Hydrogen
FrontierCodeNot measured44.2%Only Kimi K3 measured
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdMLNot measured82.6%Only Kimi K3 measured
MirrorCodeNot measured54.4%Only Kimi K3 measured
ALE-BenchNot measured1524.5Only Kimi K3 measured
LMArena Text: coding15161506Gemini 4 Hydrogen
LMArena Text: software and IT15131497Gemini 4 Hydrogen
LMArena WebDev: React17241672Gemini 4 Hydrogen
LMArena WebDev: HTML17431640Gemini 4 Hydrogen
LMArena WebDev: from an imageNot measured1586Only Kimi K3 measured
SWE-Bench Pro V2Not measured97.7%Only Kimi K3 measured
GameBench 2Not measured49.8Only Kimi K3 measured
Terminal-Bench 4.0Not measured22.4%Only Kimi K3 measured
CursorBench 4.057.8%Not measuredOnly Gemini 4 Hydrogen measured
Neither model has a result on the other 21 boards here
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Intelligence benchmarks for Gemini 4 Hydrogen and Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
AA Intelligence IndexNot measured17.4Only Kimi K3 measured
Epoch Capabilities IndexNot measured158.6Only Kimi K3 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index51
Agentic work benchmarks for Gemini 4 Hydrogen and Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
AA Agentic IndexNot measured29.3Only Kimi K3 measured
Design Arena: agents building web appsNot measured1273Only Kimi K3 measured
Design Arena: agents building full-stack appsNot measured1290Only Kimi K3 measured
Design Arena: agents building mobile appsNot measured1253Only Kimi K3 measured
Design Arena: agents building Android appsNot measured1256Only Kimi K3 measured
Design Arena: agents building Godot gamesNot measured1200Only Kimi K3 measured
Design Arena: agents building gamesNot measured1198Only Kimi K3 measured
Design Arena: HTML slidesNot measured1151Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1223Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1068Only Kimi K3 measured
LiveBench research86.8%79.8%Gemini 4 Hydrogen
LiveBench browser77.1%75.2%Gemini 4 Hydrogen
LiveBench long agentic61.8%36.0%Gemini 4 Hydrogen
Finance Agent (Vals AI)Not measured53.1%Only Kimi K3 measured
Tax Agent Bench (Vals AI)52.3%33.4%Gemini 4 Hydrogen
Legal Research Bench (Vals AI)53.8%46.1%Gemini 4 Hydrogen
Harvey's Legal Agent Benchmark (Vals AI)11.3%12.9%Kimi K3
Excel Modeling Benchmark (Vals AI)Not measured66.7%Only Kimi K3 measured
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)Not measured1.4%Only Kimi K3 measured
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
APEX-AgentsNot measured47.8%Only Kimi K3 measured
PostTrainBenchNot measured31.5%Only Kimi K3 measured
Vending-Bench 2Not measured$5,165Only Kimi K3 measured
MCP AtlasNot measured82.3%Only Kimi K3 measured
Toolathlon-VerifiedNot measured76.5%Only Kimi K3 measured
τ³-BankingNot measured37.1%Only Kimi K3 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index51
Reasoning benchmarks for Gemini 4 Hydrogen and Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
GPQA DiamondNot measured92.9%Only Kimi K3 measured
LiveBench reasoning88.6%90.7%Kimi K3
MMMU Pro (Vals AI)Not measured88.2%Only Kimi K3 measured
GPQA Diamond (Artificial Analysis run)Not measured93.5%Only Kimi K3 measured
Humanity's Last Exam (Artificial Analysis run)Not measured46.9%Only Kimi K3 measured
HLE-Diamond (Artificial Analysis run)58.8%26.9%Gemini 4 Hydrogen
CritPt v2, hard subset (Artificial Analysis run)66.0%40.5%Gemini 4 Hydrogen
GPQA Diamond (Epoch AI run)Not measured93.1%Only Kimi K3 measured
ARC-AGINot measured94.5%Only Kimi K3 measured
ARC-AGI-2Not measured60.4%Only Kimi K3 measured
SimpleBenchNot measured60.7%Only Kimi K3 measured
Chess puzzlesNot measured37.0%Only Kimi K3 measured
Mystery game puzzlesNot measured26.0%Only Kimi K3 measured
LMArena Text: hard prompts15201494Gemini 4 Hydrogen
LMArena Text: expert15581515Gemini 4 Hydrogen
LMArena Text: hard prompts in English15141493Gemini 4 Hydrogen
Humanity's Last Exam (Scale run)Not measured22.2%Only Kimi K3 measured
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Gemini 4 Hydrogen and Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
OTIS Mock AIMENot measured97.2%Only Kimi K3 measured
FrontierMath, tiers 1 to 3Not measured72.2%Only Kimi K3 measured
FrontierMath, tier 4Not measured39.0%Only Kimi K3 measured
ProofBenchNot measured87.0%Only Kimi K3 measured
LMArena Text: math15071496Gemini 4 Hydrogen
LMArena Text: mathematical work15341507Gemini 4 Hydrogen
MathArenaNot measured42.9%Only Kimi K3 measured
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for Gemini 4 Hydrogen and Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
MMLU ProNot measured88.0%Only Kimi K3 measured
LegalBench (Vals AI)Not measured86.2%Only Kimi K3 measured
CorpFin (Vals AI)Not measured71.6%Only Kimi K3 measured
TaxEval (Vals AI)Not measured75.7%Only Kimi K3 measured
MortgageTax (Vals AI)Not measured66.3%Only Kimi K3 measured
MedCode (Vals AI)Not measured49.4%Only Kimi K3 measured
AA-Omniscience46.3-1.7Gemini 4 Hydrogen
SimpleQA VerifiedNot measured50.6%Only Kimi K3 measured
LMArena Text: science15191502Gemini 4 Hydrogen
LMArena Text: medicine and healthcare14881488Kimi K3
LMArena Text: legal and government15321498Gemini 4 Hydrogen
LMArena Text: business and finance14861469Gemini 4 Hydrogen
Neither model has a result on the other 9 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index32
Web design benchmarks for Gemini 4 Hydrogen and Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
Design Arena: websites13201336Kimi K3
Design Arena: UI componentsNot measured1340Only Kimi K3 measured
Design Arena: game dev13691353Gemini 4 Hydrogen
Design Arena: data vizNot measured1350Only Kimi K3 measured
Design Arena: 3D14151364Gemini 4 Hydrogen
Design Arena: all code categories13331351Kimi K3
Design Arena: SVGNot measured1296Only Kimi K3 measured
LiveBench design77.3%72.5%Gemini 4 Hydrogen
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index141
General benchmarks for Gemini 4 Hydrogen and Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
Vals Index68.5%53.0%Gemini 4 Hydrogen
LiveBench data analysis83.2%78.7%Gemini 4 Hydrogen
Public Benefits Bench (Vals AI)Not measured68.2%Only Kimi K3 measured
SAGE (Vals AI)Not measured86.8%Only Kimi K3 measured
MedScribe (Vals AI)Not measured88.0%Only Kimi K3 measured
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
Long context reasoning (AA-LCR)Not measured88.7%Only Kimi K3 measured
GDPval-AANot measured1542Only Kimi K3 measured
DTBenchNot measured91.2%Only Kimi K3 measured
LMCANot measured52.7%Only Kimi K3 measured
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assemblyNot measured34.2%Only Kimi K3 measured
LMArena Text15021475Gemini 4 Hydrogen
LMArena Text: instruction following15191484Gemini 4 Hydrogen
LMArena Text: creative writing15091453Gemini 4 Hydrogen
LMArena Text: English14991479Gemini 4 Hydrogen
LMArena Text: non-English14951465Gemini 4 Hydrogen
LMArena Text: Chinese16311527Gemini 4 Hydrogen
LMArena Text: GermanNot measured1483Only Kimi K3 measured
LMArena Text: JapaneseNot measured1495Only Kimi K3 measured
LMArena Text: KoreanNot measured1444Only Kimi K3 measured
LMArena Text: French15121482Gemini 4 Hydrogen
LMArena Text: Spanish14941477Gemini 4 Hydrogen
LMArena Text: Russian14921481Gemini 4 Hydrogen
LMArena Text: PolishNot measured1472Only Kimi K3 measured
LMArena Text: multi-turn14851489Kimi K3
LMArena Text: longer queries15241490Gemini 4 Hydrogen
LMArena Text: writing and language15001468Gemini 4 Hydrogen
LMArena Text: entertainment and media15031450Gemini 4 Hydrogen
EQ-Bench 4Not measured1319Only Kimi K3 measured
Neither model has a result on the other 19 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 Kimi K3
BenchmarkGemini 4 HydrogenKimi K3Leader
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
Kimi K3$0.011Fits in one request

Gemini 4 Hydrogen costs less

Repository review

50K input + 3K output tokens

Gemini 4 Hydrogen$0.098Fits in one request
Kimi K3$0.195Fits in one request

Gemini 4 Hydrogen costs less

Agent loop

200K input + 10K output tokens

Gemini 4 Hydrogen$0.375Fits in one request
Kimi K3$0.750Fits 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 Kimi K3
SpecificationGoogle Gemini 4 HydrogenMoonshotAI Kimi K3
MakerGoogleMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedNovember 12, 2026July 16, 2026
Context window1.05M1.05M
Input $/Mtok$1.50$3.00
Output $/Mtok$7.50$15.00
Coding index77.961.4
Independent measurements behind it46
Cost per solved taskNot computable$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 4 Hydrogen better than Kimi K3 for coding?

Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 61.4 for Kimi K3, though on 4 benchmarks against 6. Pick Kimi K3 for work measured by Harvey's Legal Agent Benchmark (Vals AI) or LiveBench reasoning, where it leads.

Which is cheaper, Gemini 4 Hydrogen or Kimi K3?

Gemini 4 Hydrogen costs $1.50 per million input tokens and $7.50 per million output tokens; Kimi K3 costs $3.00 and $15.00. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, Gemini 4 Hydrogen or Kimi K3?

Neither: both take 1.05M tokens.

How many benchmarks is the Gemini 4 Hydrogen vs Kimi K3 comparison based on?

49 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Hydrogen's coding index rests on 4 independent benchmarks and Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gemini-4-hydrogen-vs-kimi-k3">LLMBenchmark.ai, Gemini 4 Hydrogen vs Kimi K3</a></p>