Model comparison
Claude Opus 4.5 vs Inkling
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 44.1 on the Noometry Index. Inkling costs 3.9× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.
Last verified . 35 shared benchmarks.
Summary
- They share 35 benchmarks with published results for both. Claude Opus 4.5 scores higher in 9 categories and Inkling in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Claude Opus 4.5 leads 55.4 to 34.1.
- The biggest single-benchmark swing is ProofBench: 36% for Claude Opus 4.5 and 0% for Inkling.
- Inkling is cheaper at $1.87 / $4.68 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
- Claude Opus 4.5 accepts more context: 200K tokens versus 66K.
- Inkling has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 4.5 | Inkling | |
|---|---|---|
| Provider | Anthropic | Thinking Machines Lab |
| Noometry Index | 50.5 | 44.1 |
| Released | 2025-11-01 | 2026-07-15 |
| Weights | Proprietary | Open |
| Context window | 200K | 66K |
| Max output | 64K | 66K |
| Input $ / M tokens | $5 | $1.87 |
| Output $ / M tokens | $25 | $4.68 |
| Results tracked | 69 | 41 |
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Category by category
Coding Claude Opus 4.5 leads
Claude Opus 4.5: 55.4 (#21), Inkling: 34.1 (#229)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| LMArena WebDev | 1493 | 1412 |
| WeirdML | 63.7% | 32.3% |
| LMArena Coding | 1504 | 1463 |
| ALE-Bench | 1,025 | 946 |
| SWE-bench Verified | 76.7% | — |
| FrontierCode | — | 14% |
| SWE-bench Verified (bash only) | 76.8% | — |
| SWE-bench Multilingual | 70.7% | — |
| FrontierSWE | — | 4.1% |
| SciCode | — | 47% |
| GSO | 26.5% | — |
| AlgoTune | 1.77 | — |
Agentic & Tool Use Claude Opus 4.5 leads
Claude Opus 4.5: 47.2 (#11), Inkling: 29.5 (#76)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| τ²-bench Banking | 24.7% | 25% |
| Terminal-Bench | 63.1% | — |
| APEX-Agents | — | 33.8% |
| Berkeley Function Calling Leaderboard | 77.5% | — |
| GDPval | 45.5% | — |
| Remote Labor Index | 3.8% | — |
| τ²-bench Airline | 84% | — |
| τ²-bench Retail | 79.6% | — |
| τ²-bench Telecom | 92.3% | — |
| Cybench | 82% | — |
| DeepResearch Bench | 54.8% | — |
| OSWorld | 66.3% | — |
| BALROG | 43.5% | — |
| LMArena Search | 1180 | — |
| METR Time Horizons | 75% | — |
| Vending-Bench 2 | 4,967 | — |
Reasoning Claude Opus 4.5 leads
Claude Opus 4.5: 42.5 (#43), Inkling: 40.6 (#48)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| ARC-AGI-2 | 37.6% | 36.5% |
| SimpleBench | 62% | 50% |
| ARC-AGI-1 | 80% | 79.5% |
| Chess Puzzles | 12% | 21% |
| LMArena Hard Prompts | 1476 | 1452 |
| DTBench | 89.9% | 87.5% |
| LMCA | 44.5% | 37.6% |
| Epoch Capabilities Index | 150.1 | 148.6 |
| Kagi LLM Benchmark | 80.2% | — |
| NYT Connections (extended) | 52.5% | — |
| CritPt | — | 5.4% |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 22% | — |
| ForecastBench | 60.7 | — |
Math Claude Opus 4.5 leads
Claude Opus 4.5: 38.5 (#85), Inkling: 31.2 (#198)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| FrontierMath (Tiers 1-3) | 34.4% | 33.3% |
| FrontierMath Tier 4 | 4.9% | 4.9% |
| OTIS Mock AIME 2024-2025 | 86.1% | 88.9% |
| ProofBench | 36% | 0% |
| LMArena Math | 1463 | 1482 |
| FrontierMath (Feb 2025 set) | 20.7% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Opus 4.5 leads
Claude Opus 4.5: 56.4 (#38), Inkling: 55.2 (#44)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| GPQA Diamond | 86% | 88.3% |
| SimpleQA Verified | 45.7% | 40.3% |
| LMArena Expert | 1488 | 1468 |
| Humanity's Last Exam | 25.2% | — |
| Vectara Hallucination Rate | 10.9% | — |
Multimodal Not comparable
Claude Opus 4.5: 31.1 (#99), Inkling: —
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Furniture Assembly | 28.3% | — |
| LMArena Document | 1462 | — |
Multilingual Too close to call
Claude Opus 4.5: 54.5 (#45), Inkling: 54.2 (#49)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| LMArena Non-English | 1438 | 1434 |
| LMArena Chinese | 1470 | 1495 |
| LMArena French | 1471 | 1453 |
| LMArena German | 1449 | 1456 |
| LMArena Japanese | 1415 | 1428 |
| LMArena Korean | 1424 | 1401 |
| LMArena Russian | 1448 | 1430 |
| LMArena Spanish | 1455 | 1442 |
Instruction Following Claude Opus 4.5 leads
Claude Opus 4.5: 77.7 (#20), Inkling: 75.3 (#65)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| LMArena Instruction Following | 1478 | 1427 |
Long Context Claude Opus 4.5 leads
Claude Opus 4.5: 46.4 (#21), Inkling: 43.9 (#79)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| LMArena Longer Query | 1480 | 1436 |
| CL-bench | 21.1% | — |
Writing & Preference Claude Opus 4.5 leads
Claude Opus 4.5: 68.2 (#28), Inkling: 65.5 (#48)
| Benchmark | Claude Opus 4.5 | Inkling |
|---|---|---|
| LMArena Text | 1451 | 1443 |
| LMArena Creative Writing | 1445 | 1390 |
| EQ-Bench Creative Writing | 1687 | 1611 |
| LMArena Multi-Turn | 1466 | 1436 |
| EQ-Bench 4 | — | 1226 |
Frequently asked questions
Is Claude Opus 4.5 better than Inkling?
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 44.1 on the Noometry Index. Inkling costs 3.9× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.
Which is cheaper, Claude Opus 4.5 or Inkling?
Inkling is cheaper. It lists at $1.87 per million input tokens and $4.68 per million output tokens; Claude Opus 4.5 lists at $5 and $25.
Is Claude Opus 4.5 or Inkling better for coding?
Claude Opus 4.5 scores higher on coding benchmarks: 55.4 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
Claude Opus 4.5 does, with 200K tokens against 66K.
How many benchmarks do Claude Opus 4.5 and Inkling share?
35 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Inkling has 41.