Claude Sonnet 5 vs Inkling Small
Updated October 21, 2026. 80 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick Claude Sonnet 5 for coding: it scores 63.5 on the Vibe Coding Index against 29.9 for Inkling Small.
Pick Inkling Small when output tokens cost 8.3x less, or when a solved task costs $0.16 against $1.87.
- Shared results
- 80
- Claude Sonnet 5 only
- 40
- Inkling Small only
- 4
- Like-for-like categories
- 7 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
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, four public coding benchmarks
Claude Sonnet 5
Claude Sonnet 5 scores 63.5 against 29.9.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Sonnet 5
Claude Sonnet 5 leads, 38.2 against 25.7.
Same board, both measured
Agentic work
AA Agentic Index
Claude Sonnet 5
Claude Sonnet 5 leads, 43.6 against 23.5.
Same board, both measured
Reasoning
GPQA Diamond
Claude Sonnet 5
Claude Sonnet 5 leads, 88.9% against 83.6%.
Same board, both measured
Knowledge
MMLU Pro
Claude Sonnet 5
Claude Sonnet 5 leads, 87.5% against 85.6%.
Same board, both measured
Web design
Design Arena: websites
No call
Only Claude Sonnet 5 has a Design Arena: websites result, 1274.
Directional only
General
Vals Index
No call
Only Inkling Small has a Vals Index result, 27.6%.
Directional only
Long documents
Listed context window
Claude Sonnet 5
Claude Sonnet 5 takes 1M tokens against 524K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Inkling Small
Claude Sonnet 5 $0.0070, Inkling Small $0.0010 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Inkling Small
Claude Sonnet 5 $1.87, Inkling Small $0.16.
Published attempt cost and pass rate
At a glance
- Coding index
- Claude Sonnet 5 63.5 from 2 benchmarks, Inkling Small 29.9 from 1 benchmark.
- Widest category
- Agentic work, 19.5 points apart on average over 5 shared benchmarks.
- Widest single gap
- ProofBench: Claude Sonnet 5 77.0% against Inkling Small 6.0%, 71.0 points apart on a 0 to 100 scale.
- Output price
- Claude Sonnet 5 $10.00 against Inkling Small $1.20 per million output tokens, 8.3x apart.
- Context window
- Claude Sonnet 5 takes 1M tokens, Inkling Small 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 | Claude Sonnet 5 | Bars | Inkling Small | Ties |
|---|---|---|---|---|
| Coding | 15 | 3 | ||
| Intelligence | 2 | 0 | ||
| Agentic work | 5 | 0 | ||
| Reasoning | 10 | 0 | ||
| Math | 6 | 0 | ||
| Knowledge | 10 | 1 | ||
| General | 26 | 2 | ||
| All shared boards | 74 | 6 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index153
| Benchmark | Claude Sonnet 5 | Inkling Small | Leader |
|---|---|---|---|
| LiveBench coding | 74.7% | Not measured | Only Claude Sonnet 5 measured |
| LMArena WebDev | 1540 | 1409 | Claude Sonnet 5 |
| AA Coding Index | 71.5 | 52.9 | Claude Sonnet 5 |
| LiveCodeBench (Vals AI) | 82.4% | 85.9% | Inkling Small |
| SWE-bench Verified (Vals AI) | 79.6% | 82.2% | Inkling Small |
| Terminal-Bench 4 (Vals AI) | 10.6% | 0.0% | Claude Sonnet 5 |
| Vibe Code Bench (Vals AI) | 81.3% | 19.1% | Claude Sonnet 5 |
| Code migration (Vals AI) | 44.4% | 13.7% | Claude Sonnet 5 |
| ProgramBench (Vals AI) | 0.0% | 0.5% | Inkling Small |
| IOI (Vals AI) | 45.0% | 9.3% | Claude Sonnet 5 |
| Terminal-Bench 2.1 (Vals AI) | 74.5% | 55.1% | Claude Sonnet 5 |
| Vibe Code Bench 1-100 (Vals AI) | 13.8% | Not measured | Only Claude Sonnet 5 measured |
| SkillsBench (Vals AI) | 46.5% | 33.6% | Claude Sonnet 5 |
| CyberBench (Vals AI) | 70.3% | 64.1% | Claude Sonnet 5 |
| SciCode | 54.3% | 49.7% | Claude Sonnet 5 |
| FrontierCode | 42.7% | Not measured | Only Claude Sonnet 5 measured |
| GSO-Bench | 37.3% | Not measured | Only Claude Sonnet 5 measured |
| WeirdML | 68.8% | Not measured | Only Claude Sonnet 5 measured |
| ALE-Bench | 1463.1 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: coding | 1483 | 1450 | Claude Sonnet 5 |
| LMArena Text: software and IT | 1474 | 1447 | Claude Sonnet 5 |
| LMArena WebDev: React | 1541 | 1399 | Claude Sonnet 5 |
| LMArena WebDev: HTML | 1527 | 1398 | Claude Sonnet 5 |
| LMArena WebDev: from an image | 1540 | 1410 | Claude Sonnet 5 |
| Neither model has a result on the other 14 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Sonnet 5 | Inkling Small | Leader |
|---|---|---|---|
| AA Intelligence Index | 38.2 | 25.7 | Claude Sonnet 5 |
| Epoch Capabilities Index | 156.9 | 150.3 | Claude Sonnet 5 |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Claude Sonnet 5 | Inkling Small | Leader |
|---|---|---|---|
| AA Agentic Index | 43.6 | 23.5 | Claude Sonnet 5 |
| Design Arena: agents building web apps | 1245 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building full-stack apps | 1249 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building mobile apps | 1215 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building Android apps | 1231 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building Godot games | 1225 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building games | 1227 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: HTML slides | 1218 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: PowerPoint slides | 1216 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: spreadsheets | 1004 | Not measured | Only Claude Sonnet 5 measured |
| LiveBench research | 82.8% | Not measured | Only Claude Sonnet 5 measured |
| LiveBench browser | 72.0% | Not measured | Only Claude Sonnet 5 measured |
| LiveBench long agentic | 39.0% | Not measured | Only Claude Sonnet 5 measured |
| SREBench (Vals AI) | 0.4% | Not measured | Only Claude Sonnet 5 measured |
| Finance Agent (Vals AI) | 53.9% | 41.3% | Claude Sonnet 5 |
| Tax Agent Bench (Vals AI) | 29.4% | 15.4% | Claude Sonnet 5 |
| Legal Research Bench (Vals AI) | 41.8% | 25.5% | Claude Sonnet 5 |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 2.9% | Only Inkling Small measured |
| Excel Modeling Benchmark (Vals AI) | 66.3% | 31.8% | Claude Sonnet 5 |
| Terminal-Bench-Science (Vals AI) | 5.7% | Not measured | Only Claude Sonnet 5 measured |
| APEX-Agents | 54.5% | Not measured | Only Claude Sonnet 5 measured |
| Vending-Bench 2 | $6,378 | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 17 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index100
| Benchmark | Claude Sonnet 5 | Inkling Small | Leader |
|---|---|---|---|
| GPQA Diamond | 88.9% | 83.6% | Claude Sonnet 5 |
| LiveBench reasoning | 88.7% | Not measured | Only Claude Sonnet 5 measured |
| MMMU Pro (Vals AI) | 83.0% | Not measured | Only Claude Sonnet 5 measured |
| GPQA Diamond (Artificial Analysis run) | 91.1% | 89.5% | Claude Sonnet 5 |
| Humanity's Last Exam (Artificial Analysis run) | 41.3% | 33.3% | Claude Sonnet 5 |
| GPQA Diamond (Epoch AI run) | 90.5% | 88.5% | Claude Sonnet 5 |
| ARC-AGI | Not measured | 84.0% | Only Inkling Small measured |
| ARC-AGI-2 | Not measured | 40.1% | Only Inkling Small measured |
| SimpleBench | 60.6% | Not measured | Only Claude Sonnet 5 measured |
| Chess puzzles | 45.0% | Not measured | Only Claude Sonnet 5 measured |
| Mystery game puzzles | 35.0% | 6.0% | Claude Sonnet 5 |
| LMArena Text: hard prompts | 1461 | 1423 | Claude Sonnet 5 |
| LMArena Text: expert | 1489 | 1441 | Claude Sonnet 5 |
| LMArena Text: hard prompts in English | 1464 | 1429 | Claude Sonnet 5 |
| LMArena Vision: diagrams | 1293 | 1251 | Claude Sonnet 5 |
| LMArena Vision: homework | 1311 | 1257 | Claude Sonnet 5 |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | Claude Sonnet 5 | Inkling Small | Leader |
|---|---|---|---|
| OTIS Mock AIME | 94.7% | 90.0% | Claude Sonnet 5 |
| FrontierMath, tiers 1 to 3 | 65.6% | 46.3% | Claude Sonnet 5 |
| FrontierMath, tier 4 | 29.3% | 17.1% | Claude Sonnet 5 |
| ProofBench | 77.0% | 6.0% | Claude Sonnet 5 |
| LMArena Text: math | 1467 | 1459 | Claude Sonnet 5 |
| LMArena Text: mathematical work | 1481 | 1441 | Claude Sonnet 5 |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
| Benchmark | Claude Sonnet 5 | Inkling Small | Leader |
|---|---|---|---|
| MMLU Pro | 87.5% | 85.6% | Claude Sonnet 5 |
| LegalBench (Vals AI) | 83.9% | 83.0% | Claude Sonnet 5 |
| CorpFin (Vals AI) | 67.0% | 69.6% | Inkling Small |
| TaxEval (Vals AI) | 75.6% | 75.5% | Claude Sonnet 5 |
| MortgageTax (Vals AI) | 70.0% | 62.3% | Claude Sonnet 5 |
| MedCode (Vals AI) | 47.5% | 37.9% | Claude Sonnet 5 |
| SimpleQA Verified | 33.7% | 19.1% | Claude Sonnet 5 |
| LMArena Text: science | 1460 | 1428 | Claude Sonnet 5 |
| LMArena Text: medicine and healthcare | 1442 | 1413 | Claude Sonnet 5 |
| LMArena Text: legal and government | 1454 | 1415 | Claude Sonnet 5 |
| LMArena Text: business and finance | 1436 | 1413 | Claude Sonnet 5 |
| Neither model has a result on the other 6 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
| Benchmark | Claude Sonnet 5 | Inkling Small | Leader |
|---|---|---|---|
| Design Arena: websites | 1274 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: UI components | 1279 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: game dev | 1278 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: data viz | 1251 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: 3D | 1261 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: all code categories | 1276 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: SVG | 1193 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: ASCII art | 1207 | Not measured | Only Claude Sonnet 5 measured |
| LiveBench design | 82.0% | Not measured | Only Claude Sonnet 5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index262
| Benchmark | Claude Sonnet 5 | Inkling Small | Leader |
|---|---|---|---|
| Vals Index | Not measured | 27.6% | Only Inkling Small measured |
| LiveBench data analysis | 71.7% | Not measured | Only Claude Sonnet 5 measured |
| Public Benefits Bench (Vals AI) | 66.0% | 59.4% | Claude Sonnet 5 |
| SAGE (Vals AI) | 48.9% | 32.7% | Claude Sonnet 5 |
| MedScribe (Vals AI) | 76.0% | 84.1% | Inkling Small |
| Vals Multimodal Index | 68.8% | 50.0% | Claude Sonnet 5 |
| Long context reasoning (AA-LCR) | 82.0% | 75.7% | Claude Sonnet 5 |
| DTBench | 92.5% | Not measured | Only Claude Sonnet 5 measured |
| LMCA | 50.0% | Not measured | Only Claude Sonnet 5 measured |
| Surface Evolver Bench | 60.0% | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text | 1442 | 1413 | Claude Sonnet 5 |
| LMArena Text: instruction following | 1452 | 1399 | Claude Sonnet 5 |
| LMArena Text: creative writing | 1416 | 1334 | Claude Sonnet 5 |
| LMArena Vision | 1273 | 1237 | Claude Sonnet 5 |
| LMArena Text: English | 1450 | 1421 | Claude Sonnet 5 |
| LMArena Text: non-English | 1431 | 1401 | Claude Sonnet 5 |
| LMArena Text: Chinese | 1478 | 1464 | Claude Sonnet 5 |
| LMArena Text: German | 1442 | 1408 | Claude Sonnet 5 |
| LMArena Text: Japanese | 1422 | 1401 | Claude Sonnet 5 |
| LMArena Text: Korean | 1412 | 1367 | Claude Sonnet 5 |
| LMArena Text: French | 1463 | 1435 | Claude Sonnet 5 |
| LMArena Text: Spanish | 1438 | 1422 | Claude Sonnet 5 |
| LMArena Text: Russian | 1450 | 1394 | Claude Sonnet 5 |
| LMArena Text: Polish | 1425 | 1428 | Inkling Small |
| LMArena Text: multi-turn | 1453 | 1416 | Claude Sonnet 5 |
| LMArena Text: longer queries | 1462 | 1402 | Claude Sonnet 5 |
| LMArena Text: writing and language | 1436 | 1357 | Claude Sonnet 5 |
| LMArena Text: entertainment and media | 1411 | 1352 | Claude Sonnet 5 |
| LMArena Vision: English | 1275 | 1243 | Claude Sonnet 5 |
| LMArena Vision: Chinese | 1331 | 1292 | Claude Sonnet 5 |
| LMArena Vision: reading text | 1288 | 1243 | Claude Sonnet 5 |
| LMArena Vision: humor | 1261 | 1207 | Claude Sonnet 5 |
| LMArena Vision: creative writing | 1246 | 1205 | Claude Sonnet 5 |
| LMArena Document | 1466 | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 12 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Sonnet 5 | Inkling Small | 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 Small costs less
Repository review
50K input + 3K output tokens
Inkling Small costs less
Agent loop
200K input + 10K output tokens
Inkling Small 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 | Anthropic Claude Sonnet 5 | Thinking Machines Inkling Small |
|---|---|---|
| Maker | Anthropic | Thinking Machines |
| Weights | No public weights listed | Open weights |
| Released | June 30, 2026 | July 30, 2026 |
| Context window | 1M | 524K |
| Input $/Mtok | $2.00 | $0.45 |
| Output $/Mtok | $10.00 | $1.20 |
| Coding index | 63.5 | 29.9 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | $1.87 | $0.16 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Sonnet 5 better than Inkling Small for coding?
Pick Claude Sonnet 5 for coding: it scores 63.5 on the Vibe Coding Index against 29.9 for Inkling Small. Pick Inkling Small when output tokens cost 8.3x less, or when a solved task costs $0.16 against $1.87.
Which is cheaper, Claude Sonnet 5 or Inkling Small?
Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; Inkling Small costs $0.45 and $1.20. Per solved SWE-bench Verified task, Claude Sonnet 5 costs $1.87 and Inkling Small $0.16.
Which has the bigger context window, Claude Sonnet 5 or Inkling Small?
Claude Sonnet 5, with 1M tokens against 524K.
How many benchmarks is the Claude Sonnet 5 vs Inkling Small comparison based on?
80 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 5's coding index rests on 2 independent benchmarks and Inkling Small's on 1. Where only one model has a result, the page says so instead of naming a winner.