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GPT-5.6 Terra vs Kimi K3

GPT-5.6 Terra leads Kimi K3 on coding, 63.9 to 62.3 on the Vibe Coding Index, and GPT-5.6 Terra costs 1.3x less per output token ($12.00 vs $15.00 per million). Updated October 22, 2026; 108 benchmarks have a result for both.

Replace GPT-5.6 Terra Replace Kimi K3
GPT-5.6 TerraOpenAI
Coding
63.9
Overall
68.1
Output $/M
$12.00
28
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
80
vs boards won of 108 shared

GPT-5.6 Terra or Kimi K3: which to pick

GPT-5.6 Terra and Kimi K3 are level for coding, 63.9 against 62.3 on the Vibe Coding Index, so price and context decide.

Pick Kimi K3 for work measured by LMArena WebDev or LiveCodeBench (Vals AI), where it leads. Pick GPT-5.6 Terra for output tokens 1.3x cheaper ($12.00 vs $15.00 per million) and a lower cost per solved task ($0.42 against $0.81).

Model AGPT-5.6 TerraOpenAI63.9/1006 independent benchmarks$0.42 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
108
GPT-5.6 Terra only
19
Kimi K3 only
9
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
GPT-5.6 Terra 63.9 from 6 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Agentic work, 16.5 points apart on average over 18 shared benchmarks.
Widest single gap
LiveBench browser: GPT-5.6 Terra 84.0% against Kimi K3 16.0%, 68.0 points apart on a 0 to 100 scale.
Output price
GPT-5.6 Terra $12.00 against Kimi K3 $15.00 per million output tokens, 1.3x apart.
Context window
GPT-5.6 Terra takes 1.05M tokens, Kimi K3 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
CategoryGPT-5.6 TerraBarsKimi K3Ties
Coding715
Intelligence11
Agentic work612
Reasoning59
Math33
Knowledge29
Web design08
General423
All shared boards2880
CodingLike-for-likeSix of these boards feed the Vibe Coding Index715
Coding benchmarks for GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi K3Leader
LiveBench coding86.2%59.3%GPT-5.6 Terra
LMArena WebDev15221655Kimi K3
AA Coding Index76.776.2GPT-5.6 Terra
LiveCodeBench (Vals AI)85.9%87.2%Kimi K3
SWE-bench Verified (Vals AI)95.4%93.4%GPT-5.6 Terra
Terminal-Bench 4 (Vals AI)22.7%17.2%GPT-5.6 Terra
Vibe Code Bench (Vals AI)74.6%85.0%Kimi K3
Code migration (Vals AI)47.8%16.1%GPT-5.6 Terra
ProgramBench (Vals AI)0.5%2.0%Kimi K3
IOI (Vals AI)87.6%48.9%GPT-5.6 Terra
Terminal-Bench 2.1 (Vals AI)77.5%80.9%Kimi K3
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)14.8%18.2%Kimi K3
SkillsBench (Vals AI)58.9%Not measuredOnly GPT-5.6 Terra measured
CyberBench (Vals AI)72.1%75.2%Kimi K3
SciCode55.0%59.5%Kimi K3
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly GPT-5.6 Terra measured
FrontierCode41.3%44.2%Kimi K3
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdML78.3%82.6%Kimi K3
ALE-Bench1951.41524.5GPT-5.6 Terra
LMArena Text: coding14851508Kimi K3
LMArena Text: software and IT14821499Kimi K3
LMArena WebDev: React15131670Kimi K3
LMArena WebDev: HTML15261644Kimi K3
LMArena WebDev: from an image15411579Kimi K3
SciCode10.8%Not measuredOnly GPT-5.6 Terra measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi K3Leader
AA Intelligence Index42.143.6Kimi K3
Epoch Capabilities Index160.1157.9GPT-5.6 Terra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index612
Agentic work benchmarks for GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi K3Leader
AA Agentic Index43.250.0Kimi K3
Design Arena: agents building web apps11201295Kimi K3
Design Arena: agents building full-stack apps10611315Kimi K3
Design Arena: agents building mobile apps11111269Kimi K3
Design Arena: agents building Android apps10621253Kimi K3
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building games10831252Kimi K3
Design Arena: HTML slides10581206Kimi K3
Design Arena: PowerPoint slides11051247Kimi K3
Design Arena: spreadsheetsNot measured1070Only Kimi K3 measured
LiveBench research60.4%79.0%Kimi K3
LiveBench browser84.0%16.0%GPT-5.6 Terra
LiveBench long agentic48.4%42.8%GPT-5.6 Terra
SREBench (Vals AI)9.5%Not measuredOnly GPT-5.6 Terra measured
Finance Agent (Vals AI)54.4%53.1%GPT-5.6 Terra
Tax Agent Bench (Vals AI)30.0%33.4%Kimi K3
Legal Research Bench (Vals AI)41.4%46.1%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)66.2%66.7%Kimi K3
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)10.0%1.4%GPT-5.6 Terra
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
τ²-Bench Telecom86.3%Not measuredOnly GPT-5.6 Terra measured
APEX-Agents58.2%47.8%GPT-5.6 Terra
BALROG53.2%Not measuredOnly GPT-5.6 Terra measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2$7,343$5,165GPT-5.6 Terra
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index59
Reasoning benchmarks for GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi K3Leader
GPQA Diamond90.9%92.9%Kimi K3
LiveBench reasoning90.6%90.7%Kimi K3
MMMU Pro (Vals AI)86.5%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)92.5%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)42.9%46.9%Kimi K3
GPQA Diamond (Epoch AI run)93.3%93.1%GPT-5.6 Terra
ARC-AGI96.5%94.5%GPT-5.6 Terra
ARC-AGI-283.9%60.4%GPT-5.6 Terra
SimpleBench48.9%60.7%Kimi K3
Chess puzzles47.0%37.0%GPT-5.6 Terra
Mystery game puzzles35.0%26.0%GPT-5.6 Terra
LMArena Text: hard prompts14691495Kimi K3
LMArena Text: expert14961520Kimi K3
LMArena Text: hard prompts in English14651496Kimi K3
LMArena Vision: diagrams1295Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: homework1312Not measuredOnly GPT-5.6 Terra measured
Kagi LLM Benchmark51.3%Not measuredOnly GPT-5.6 Terra measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi K3Leader
OTIS Mock AIME99.7%97.2%GPT-5.6 Terra
FrontierMath, tiers 1 to 386.0%72.2%GPT-5.6 Terra
FrontierMath, tier 470.7%39.0%GPT-5.6 Terra
ProofBench74.0%87.0%Kimi K3
LMArena Text: math14651494Kimi K3
LMArena Text: mathematical work14781505Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index29
Knowledge benchmarks for GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi K3Leader
MMLU Pro86.7%88.0%Kimi K3
LegalBench (Vals AI)85.1%86.2%Kimi K3
CorpFin (Vals AI)65.3%71.6%Kimi K3
TaxEval (Vals AI)76.2%75.7%GPT-5.6 Terra
MortgageTax (Vals AI)67.3%66.3%GPT-5.6 Terra
MedCode (Vals AI)43.4%49.4%Kimi K3
SimpleQA Verified43.2%50.6%Kimi K3
LMArena Text: science14521508Kimi K3
LMArena Text: medicine and healthcare14301489Kimi K3
LMArena Text: legal and government14611503Kimi K3
LMArena Text: business and finance14481470Kimi K3
FACTS Benchmark Suite52.0%Not measuredOnly 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 index08
Web design benchmarks for GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi K3Leader
Design Arena: websites12681334Kimi K3
Design Arena: UI components12561341Kimi K3
Design Arena: game dev12291358Kimi K3
Design Arena: data viz12401351Kimi K3
Design Arena: 3D11341387Kimi K3
Design Arena: all code categories12411360Kimi K3
Design Arena: SVG12191302Kimi K3
Design Arena: ASCII art1177Not measuredOnly GPT-5.6 Terra measured
LiveBench design76.0%77.2%Kimi K3
GeneralLike-for-likePublic boards, shown as published, kept out of the index423
General benchmarks for GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysis79.3%78.7%GPT-5.6 Terra
Public Benefits Bench (Vals AI)62.4%68.2%Kimi K3
SAGE (Vals AI)47.0%52.8%Kimi K3
MedScribe (Vals AI)82.9%88.0%Kimi K3
Vals Multimodal Index65.1%73.4%Kimi K3
IFBench71.2%Not measuredOnly GPT-5.6 Terra measured
Long context reasoning (AA-LCR)83.0%88.7%Kimi K3
DTBench93.3%91.2%GPT-5.6 Terra
LMCA54.9%52.7%GPT-5.6 Terra
Surface Evolver Bench83.8%95.0%Kimi K3
Furniture assembly54.2%34.2%GPT-5.6 Terra
LMArena Text14481476Kimi K3
LMArena Text: instruction following14561485Kimi K3
LMArena Text: creative writing14131457Kimi K3
LMArena Vision1271Not measuredOnly GPT-5.6 Terra measured
LMArena Text: English14491481Kimi K3
LMArena Text: non-English14411466Kimi K3
LMArena Text: Chinese15141529Kimi K3
LMArena Text: German14601490Kimi K3
LMArena Text: Japanese14541494Kimi K3
LMArena Text: Korean14271460Kimi K3
LMArena Text: French14661492Kimi K3
LMArena Text: Spanish14511472Kimi K3
LMArena Text: Russian14521485Kimi K3
LMArena Text: Polish14461458Kimi K3
LMArena Text: multi-turn14531489Kimi K3
LMArena Text: longer queries14541494Kimi K3
LMArena Text: writing and language14311471Kimi K3
LMArena Text: entertainment and media14181453Kimi K3
LMArena Vision: English1272Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: Chinese1337Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: reading text1278Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: humor1236Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: creative writing1248Not measuredOnly GPT-5.6 Terra measured
LMArena Document1472Not measuredOnly 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 GPT-5.6 Terra and Kimi K3
BenchmarkGPT-5.6 TerraKimi 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

GPT-5.6 Terra$0.0080Fits in one request
Kimi K3$0.011Fits in one request

GPT-5.6 Terra costs less

Repository review

50K input + 3K output tokens

GPT-5.6 Terra$0.136Fits in one request
Kimi K3$0.195Fits in one request

GPT-5.6 Terra costs less

Agent loop

200K input + 10K output tokens

GPT-5.6 Terra$0.520Fits in one request
Kimi K3$0.750Fits in one request

GPT-5.6 Terra 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 GPT-5.6 Terra and Kimi K3
SpecificationOpenAI GPT-5.6 TerraMoonshotAI Kimi K3
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJuly 9, 2026July 16, 2026
Context window1.05M1.05M
Input $/Mtok$2.00$3.00
Output $/Mtok$12.00$15.00
Coding index63.962.3
Independent measurements behind it66
Cost per solved task$0.42$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.6 Terra better than Kimi K3 for coding?

GPT-5.6 Terra and Kimi K3 are level for coding, 63.9 against 62.3 on the Vibe Coding Index, so price and context decide. Pick Kimi K3 for work measured by LMArena WebDev or LiveCodeBench (Vals AI), where it leads. Pick GPT-5.6 Terra for output tokens 1.3x cheaper ($12.00 vs $15.00 per million) and a lower cost per solved task ($0.42 against $0.81).

Which is cheaper, GPT-5.6 Terra or Kimi K3?

GPT-5.6 Terra costs $2.00 per million input tokens and $12.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. Per solved SWE-bench Verified task, GPT-5.6 Terra costs $0.42 and Kimi K3 $0.81.

Which has the bigger context window, GPT-5.6 Terra or Kimi K3?

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

How many benchmarks is the GPT-5.6 Terra vs Kimi K3 comparison based on?

108 benchmarks have a result for both models as of October 22, 2026. GPT-5.6 Terra's coding index rests on 6 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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