Model comparison
Claude Sonnet 4 vs Inkling
Inkling is the stronger model overall, scoring 44.1 to 40.8 on the Noometry Index.
Last verified . 30 shared benchmarks.
Summary
- They share 30 benchmarks with published results for both. Claude Sonnet 4 scores higher in 3 categories and Inkling in 6 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Inkling leads 40.4 to 22.9.
- The biggest single-benchmark swing is ARC-AGI-1: 40% for Claude Sonnet 4 and 79.5% for Inkling.
- Inkling is cheaper at $1.87 / $4.68 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.
- Claude Sonnet 4 accepts more context: 200K tokens versus 66K.
- Inkling has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 4 | Inkling | |
|---|---|---|
| Provider | Anthropic | Thinking Machines Lab |
| Noometry Index | 40.8 | 44.1 |
| Released | 2025-05-22 | 2026-07-15 |
| Weights | Proprietary | Open |
| Context window | 200K | 66K |
| Max output | 64K | 66K |
| Input $ / M tokens | $3 | $1.87 |
| Output $ / M tokens | $15 | $4.68 |
| Results tracked | 58 | 41 |
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Category by category
Coding Claude Sonnet 4 leads
Claude Sonnet 4: 43.5 (#88), Inkling: 34.5 (#234)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| SciCode | 40% | 47% |
| WeirdML | 46.1% | 32.3% |
| LMArena Coding | 1414 | 1464 |
| ALE-Bench | 655.35 | 946 |
| FrontierCode | — | 14% |
| SWE-bench Verified (bash only) | 64.9% | — |
| Aider Polyglot | 61.3% | — |
| LMArena WebDev | — | 1413 |
| FrontierSWE | — | 4.1% |
| GSO | 4.9% | — |
Agentic & Tool Use Claude Sonnet 4 leads
Claude Sonnet 4: 38.5 (#31), Inkling: 29.6 (#85)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| APEX-Agents | — | 33.8% |
| TheAgentCompany | 33.1% | — |
| τ²-bench Banking | — | 25% |
| Cybench | 35% | — |
| DeepResearch Bench | 46.6% | — |
| OSWorld | 43.9% | — |
| METR Time Horizons | 62% | — |
Reasoning Inkling leads
Claude Sonnet 4: 22.9 (#187), Inkling: 40.4 (#56)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| ARC-AGI-2 | 5.9% | 36.5% |
| SimpleBench | 45.5% | 50% |
| ARC-AGI-1 | 40% | 79.5% |
| CritPt | 0.3% | 5.4% |
| LMArena Hard Prompts | 1372 | 1451 |
| DTBench | 77.1% | 87.5% |
| LMCA | 29% | 37.6% |
| Epoch Capabilities Index | 141.69 | 148.54 |
| Kagi LLM Benchmark | 73% | — |
| Chess Puzzles | — | 21% |
| EnigmaEval | 3.1% | — |
| ForecastBench | 60.2 | — |
Math Claude Sonnet 4 leads
Claude Sonnet 4: 43.3 (#80), Inkling: 31.3 (#225)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 71.1% | 88.9% |
| LMArena Math | 1375 | 1479 |
| FrontierMath (Tiers 1-3) | — | 33.3% |
| FrontierMath Tier 4 | — | 4.9% |
| ProofBench | — | 0% |
| Omni-MATH | 60.2% | — |
| MATH Level 5 | 84.4% | — |
| FrontierMath (Feb 2025 set) | 4.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Inkling leads
Claude Sonnet 4: 41.8 (#108), Inkling: 55.1 (#49)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| GPQA Diamond | 79.2% | 88.3% |
| LMArena Expert | 1372 | 1465 |
| Humanity's Last Exam | 7.8% | — |
| SimpleQA Verified | — | 40.3% |
| MMLU-Pro | 84.3% | — |
| Confabulations | 13.2% | — |
| Vectara Hallucination Rate | 10.3% | — |
| GPQA (HELM) | 70.6% | — |
Multimodal Not comparable
Claude Sonnet 4: 26.2 (#121), Inkling: —
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| LMArena Vision | 1191 | — |
| GeoBench | 37% | — |
| VPCT | 34% | — |
| MindCube | 44.8% | — |
Multilingual Inkling leads
Claude Sonnet 4: 46.7 (#156), Inkling: 54.0 (#52)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| LMArena Non-English | 1333 | 1434 |
| LMArena Chinese | 1350 | 1490 |
| LMArena French | 1363 | 1458 |
| LMArena German | 1331 | 1446 |
| LMArena Japanese | 1302 | 1429 |
| LMArena Korean | 1291 | 1404 |
| LMArena Russian | 1355 | 1429 |
| LMArena Spanish | 1357 | 1448 |
Instruction Following Inkling leads
Claude Sonnet 4: 71.7 (#145), Inkling: 75.1 (#71)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| LMArena Instruction Following | 1376 | 1426 |
| IFEval | 84% | — |
Long Context Inkling leads
Claude Sonnet 4: 33.7 (#259), Inkling: 43.8 (#86)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| LMArena Longer Query | 1398 | 1434 |
| Fiction.LiveBench | 46.9% | — |
Writing & Preference Inkling leads
Claude Sonnet 4: 57.1 (#132), Inkling: 65.2 (#51)
| Benchmark | Claude Sonnet 4 | Inkling |
|---|---|---|
| LMArena Text | 1351 | 1441 |
| LMArena Creative Writing | 1345 | 1387 |
| EQ-Bench Creative Writing | 1483 | 1611 |
| LMArena Multi-Turn | 1376 | 1436 |
| Short-Story Creative Writing | 81.4% | — |
| WildBench | 83.8% | — |
| EQ-Bench 4 | — | 1226 |
Frequently asked questions
Is Claude Sonnet 4 better than Inkling?
Inkling is the stronger model overall, scoring 44.1 to 40.8 on the Noometry Index.
Which is cheaper, Claude Sonnet 4 or Inkling?
Inkling is cheaper. It lists at $1.87 per million input tokens and $4.68 per million output tokens; Claude Sonnet 4 lists at $3 and $15.
Is Claude Sonnet 4 or Inkling better for coding?
Claude Sonnet 4 scores higher on coding benchmarks: 43.5 versus 34.5 in the Noometry coding category.
Which has the bigger context window?
Claude Sonnet 4 does, with 200K tokens against 66K.
How many benchmarks do Claude Sonnet 4 and Inkling share?
30 benchmarks have published results for both models. Claude Sonnet 4 has 58 scored results on Noometry and Inkling has 41.