Kimi K3.1 Pro vs Inkling
Kimi K3.1 Pro leads Inkling on coding, 82.2 to 31.6 on the Vibe Coding Index, and Inkling costs 2.5x less per output token ($4.05 vs $10.00 per million). Updated October 29, 2026; 30 benchmarks have a result for both.
Kimi K3.1 Pro or Inkling: which to pick
Pick Kimi K3.1 Pro for coding: it scores 82.2 on the Vibe Coding Index against 31.6 for Inkling, though on 4 benchmarks against 6.
Pick Inkling for output tokens 2.5x cheaper ($4.05 vs $10.00 per million).
- Shared results
- 30
- Kimi K3.1 Pro only
- 5
- Inkling only
- 75
- 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
Kimi K3.1 Pro
Kimi K3.1 Pro scores 82.2 against 31.6.
4 and 6 benchmarks behind the scores
Intelligence
AA Intelligence Index
Kimi K3.1 Pro
Kimi K3.1 Pro leads, 46.0 against 12.5.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Inkling has a AA Agentic Index result, 22.5.
Directional only
Reasoning
GPQA Diamond
No call
Only Inkling has a GPQA Diamond result, 87.1%.
Directional only
Knowledge
MMLU Pro
No call
Only Inkling has a MMLU Pro result, 86.3%.
Directional only
Web design
Design Arena: websites
Kimi K3.1 Pro
Kimi K3.1 Pro leads, 1325 against 1224.
Same board, both measured
General
Vals Index
Kimi K3.1 Pro
Kimi K3.1 Pro leads, 62.5% against 29.0%.
Same board, both measured
Long documents
Listed context window
Kimi K3.1 Pro
Kimi K3.1 Pro takes 1.05M tokens against 524K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Inkling
Kimi K3.1 Pro $0.0070, Inkling $0.0030 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Inkling has the number, $0.76.
Directional only
At a glance
- Coding index
- Kimi K3.1 Pro 82.2 from 4 benchmarks, Inkling 31.6 from 6 benchmarks.
- Widest category
- Math, 91.0 points apart on average over 1 shared benchmark.
- Widest single gap
- ProofBench: Kimi K3.1 Pro 91.0% against Inkling 0.0%, 91.0 points apart on a 0 to 100 scale.
- Output price
- Kimi K3.1 Pro $10.00 against Inkling $4.05 per million output tokens, 2.5x apart.
- Context window
- Kimi K3.1 Pro takes 1.05M tokens, Inkling 524K.
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.
| Category | Kimi K3.1 Pro | Bars | Inkling | Ties |
|---|---|---|---|---|
| Coding | 9 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 6 | 0 | ||
| Reasoning | 2 | 0 | ||
| Math | 1 | 0 | ||
| Web design | 8 | 0 | ||
| General | 3 | 0 | ||
| All shared boards | 30 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index90
| Benchmark | Kimi K3.1 Pro | Inkling | Leader |
|---|---|---|---|
| LiveBench coding | 81.8% | 64.0% | Kimi K3.1 Pro |
| LMArena WebDev | 1695 | 1415 | Kimi K3.1 Pro |
| AA Coding Index | Not measured | 52.1 | Only Inkling measured |
| LiveCodeBench (Vals AI) | Not measured | 85.5% | Only Inkling measured |
| SWE-bench Verified (Vals AI) | Not measured | 77.6% | Only Inkling measured |
| Terminal-Bench 4 (Vals AI) | 63.6% | 0.5% | Kimi K3.1 Pro |
| Vibe Code Bench (Vals AI) | 84.9% | 19.2% | Kimi K3.1 Pro |
| Code migration (Vals AI) | Not measured | 11.8% | Only Inkling measured |
| ProgramBench (Vals AI) | Not measured | 0.0% | Only Inkling measured |
| IOI (Vals AI) | 81.9% | 14.9% | Kimi K3.1 Pro |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 47.6% | Only Inkling measured |
| Vibe Code Bench 1-100 (Vals AI) | Not measured | 7.3% | Only Inkling measured |
| SkillsBench (Vals AI) | Not measured | 26.1% | Only Inkling measured |
| CyberBench (Vals AI) | Not measured | 66.8% | Only Inkling measured |
| SciCode | 60.8% | 47.0% | Kimi K3.1 Pro |
| FrontierCode | Not measured | 14.0% | Only Inkling measured |
| FrontierSWE | Not measured | 4.1% | Only Inkling measured |
| WeirdML | Not measured | 32.3% | Only Inkling measured |
| ALE-Bench | 1932.8 | 946.0 | Kimi K3.1 Pro |
| LMArena Text: coding | Not measured | 1466 | Only Inkling measured |
| LMArena Text: software and IT | Not measured | 1466 | Only Inkling measured |
| LMArena WebDev: React | 1701 | 1405 | Kimi K3.1 Pro |
| LMArena WebDev: HTML | 1706 | 1402 | Kimi K3.1 Pro |
| SWE-Bench Pro V2 | Not measured | 89.9% | Only Inkling measured |
| Neither model has a result on the other 19 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Kimi K3.1 Pro | Inkling | Leader |
|---|---|---|---|
| AA Intelligence Index | 46.0 | 12.5 | Kimi K3.1 Pro |
| Epoch Capabilities Index | Not measured | 148.4 | Only Inkling measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | Kimi K3.1 Pro | Inkling | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 22.5 | Only Inkling measured |
| Design Arena: agents building web apps | Not measured | 1197 | Only Inkling measured |
| LiveBench research | 77.9% | 59.9% | Kimi K3.1 Pro |
| LiveBench browser | 75.9% | 12.0% | Kimi K3.1 Pro |
| LiveBench long agentic | 39.1% | 8.5% | Kimi K3.1 Pro |
| SREBench (Vals AI) | Not measured | 0.0% | Only Inkling measured |
| Finance Agent (Vals AI) | Not measured | 46.6% | Only Inkling measured |
| Tax Agent Bench (Vals AI) | 24.9% | 15.3% | Kimi K3.1 Pro |
| Legal Research Bench (Vals AI) | 37.5% | 28.4% | Kimi K3.1 Pro |
| Harvey's Legal Agent Benchmark (Vals AI) | 11.7% | 3.8% | Kimi K3.1 Pro |
| Excel Modeling Benchmark (Vals AI) | Not measured | 38.4% | Only Inkling measured |
| BioMysteryBench (Vals AI) | 75.6% | Not measured | Only Kimi K3.1 Pro measured |
| Terminal-Bench-Science (Vals AI) | 31.4% | Not measured | Only Kimi K3.1 Pro measured |
| Vals Science Index | 44.4% | Not measured | Only Kimi K3.1 Pro measured |
| APEX-Agents | Not measured | 33.8% | Only Inkling measured |
| MCP Atlas | Not measured | 76.0% | Only Inkling measured |
| Neither model has a result on the other 26 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Kimi K3.1 Pro | Inkling | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 87.1% | Only Inkling measured |
| LiveBench reasoning | 91.1% | 78.3% | Kimi K3.1 Pro |
| MysteryMechanism (Vals AI) | 26.1% | Not measured | Only Kimi K3.1 Pro measured |
| MMMU Pro (Vals AI) | Not measured | 78.5% | Only Inkling measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 87.2% | Only Inkling measured |
| Humanity's Last Exam (Artificial Analysis run) | 52.5% | 31.9% | Kimi K3.1 Pro |
| GPQA Diamond (Epoch AI run) | Not measured | 88.3% | Only Inkling measured |
| ARC-AGI | Not measured | 79.5% | Only Inkling measured |
| ARC-AGI-2 | Not measured | 36.5% | Only Inkling measured |
| SimpleBench | Not measured | 50.0% | Only Inkling measured |
| Chess puzzles | Not measured | 21.0% | Only Inkling measured |
| LMArena Text: hard prompts | Not measured | 1452 | Only Inkling measured |
| LMArena Text: expert | Not measured | 1466 | Only Inkling measured |
| LMArena Text: hard prompts in English | Not measured | 1448 | Only Inkling measured |
| Humanity's Last Exam (Scale run) | Not measured | 11.2% | Only Inkling measured |
| Neither model has a result on the other 8 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Kimi K3.1 Pro | Inkling | Leader |
|---|---|---|---|
| OTIS Mock AIME | Not measured | 88.9% | Only Inkling measured |
| FrontierMath, tiers 1 to 3 | Not measured | 33.3% | Only Inkling measured |
| FrontierMath, tier 4 | Not measured | 4.9% | Only Inkling measured |
| ProofBench | 91.0% | 0.0% | Kimi K3.1 Pro |
| LMArena Text: math | Not measured | 1481 | Only Inkling measured |
| LMArena Text: mathematical work | Not measured | 1462 | Only Inkling measured |
| MathArena | 59.6% | Not measured | Only Kimi K3.1 Pro measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index11 boards, none shared
| Benchmark | Kimi K3.1 Pro | Inkling | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 86.3% | Only Inkling measured |
| LegalBench (Vals AI) | Not measured | 83.0% | Only Inkling measured |
| CorpFin (Vals AI) | Not measured | 68.6% | Only Inkling measured |
| TaxEval (Vals AI) | Not measured | 75.3% | Only Inkling measured |
| MortgageTax (Vals AI) | Not measured | 64.0% | Only Inkling measured |
| MedCode (Vals AI) | Not measured | 41.2% | Only Inkling measured |
| SimpleQA Verified | Not measured | 40.3% | Only Inkling measured |
| LMArena Text: science | Not measured | 1456 | Only Inkling measured |
| LMArena Text: medicine and healthcare | Not measured | 1449 | Only Inkling measured |
| LMArena Text: legal and government | Not measured | 1447 | Only Inkling measured |
| LMArena Text: business and finance | Not measured | 1439 | Only Inkling measured |
| Neither model has a result on the other 9 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | Kimi K3.1 Pro | Inkling | Leader |
|---|---|---|---|
| Design Arena: websites | 1325 | 1224 | Kimi K3.1 Pro |
| Design Arena: UI components | 1400 | 1197 | Kimi K3.1 Pro |
| Design Arena: game dev | 1410 | 1165 | Kimi K3.1 Pro |
| Design Arena: data viz | 1300 | 1158 | Kimi K3.1 Pro |
| Design Arena: 3D | 1451 | 1157 | Kimi K3.1 Pro |
| Design Arena: all code categories | 1354 | 1205 | Kimi K3.1 Pro |
| Design Arena: SVG | 1328 | 1105 | Kimi K3.1 Pro |
| Design Arena: ASCII art | Not measured | 1086 | Only Inkling measured |
| LiveBench design | 77.8% | 58.3% | Kimi K3.1 Pro |
GeneralLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Kimi K3.1 Pro | Inkling | Leader |
|---|---|---|---|
| Vals Index | 62.5% | 29.0% | Kimi K3.1 Pro |
| LiveBench data analysis | 79.1% | 72.8% | Kimi K3.1 Pro |
| Public Benefits Bench (Vals AI) | Not measured | 58.5% | Only Inkling measured |
| MedScribe (Vals AI) | Not measured | 85.4% | Only Inkling measured |
| Vals Multimodal Index | Not measured | 49.4% | Only Inkling measured |
| Long context reasoning (AA-LCR) | 86.3% | 77.3% | Kimi K3.1 Pro |
| DTBench | Not measured | 87.5% | Only Inkling measured |
| LMCA | Not measured | 37.6% | Only Inkling measured |
| LMArena Text | Not measured | 1443 | Only Inkling measured |
| LMArena Text: instruction following | Not measured | 1426 | Only Inkling measured |
| LMArena Text: creative writing | Not measured | 1392 | Only Inkling measured |
| LMArena Text: English | Not measured | 1442 | Only Inkling measured |
| LMArena Text: non-English | Not measured | 1435 | Only Inkling measured |
| LMArena Text: Chinese | Not measured | 1493 | Only Inkling measured |
| LMArena Text: German | Not measured | 1441 | Only Inkling measured |
| LMArena Text: Japanese | Not measured | 1431 | Only Inkling measured |
| LMArena Text: Korean | Not measured | 1408 | Only Inkling measured |
| LMArena Text: French | Not measured | 1461 | Only Inkling measured |
| LMArena Text: Spanish | Not measured | 1450 | Only Inkling measured |
| LMArena Text: Russian | Not measured | 1434 | Only Inkling measured |
| LMArena Text: Polish | Not measured | 1452 | Only Inkling measured |
| LMArena Text: multi-turn | Not measured | 1439 | Only Inkling measured |
| LMArena Text: longer queries | Not measured | 1436 | Only Inkling measured |
| LMArena Text: writing and language | Not measured | 1407 | Only Inkling measured |
| LMArena Text: entertainment and media | Not measured | 1396 | Only Inkling measured |
| EQ-Bench 4 | Not measured | 1212 | Only Inkling measured |
| Neither model has a result on the other 22 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Kimi K3.1 Pro | Inkling | 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
Inkling costs less
Repository review
50K input + 3K output tokens
Inkling costs less
Agent loop
200K input + 10K output tokens
Inkling 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.
| Specification | MoonshotAI Kimi K3.1 Pro | Thinking Machines Inkling |
|---|---|---|
| Maker | Moonshot AI | Thinking Machines |
| Weights | No public weights listed | Open weights |
| Released | October 23, 2026 | July 17, 2026 |
| Context window | 1.05M | 524K |
| Input $/Mtok | $2.00 | $1.00 |
| Output $/Mtok | $10.00 | $4.05 |
| Coding index | 82.2 | 31.6 |
| Independent measurements behind it | 4 | 6 |
| Cost per solved task | Not computable | $0.76 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Kimi K3.1 Pro better than Inkling for coding?
Pick Kimi K3.1 Pro for coding: it scores 82.2 on the Vibe Coding Index against 31.6 for Inkling, though on 4 benchmarks against 6. Pick Inkling for output tokens 2.5x cheaper ($4.05 vs $10.00 per million).
Which is cheaper, Kimi K3.1 Pro or Inkling?
Kimi K3.1 Pro costs $2.00 per million input tokens and $10.00 per million output tokens; Inkling costs $1.00 and $4.05. Cost per solved task is known for Inkling only.
Which has the bigger context window, Kimi K3.1 Pro or Inkling?
Kimi K3.1 Pro, with 1.05M tokens against 524K.
How many benchmarks is the Kimi K3.1 Pro vs Inkling comparison based on?
30 benchmarks have a result for both models as of October 29, 2026. Kimi K3.1 Pro's coding index rests on 4 independent benchmarks and Inkling's on 6. Where only one model has a result, the page says so instead of naming a winner.