# Claude Opus 5 vs Inkling 2 Small

> Side-by-side benchmark comparison for Claude Opus 5 and Inkling 2 Small across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-5-vs-inkling-2-small
- Last updated: November 6, 2026

- Shared sourced benchmarks: 8
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Claude Opus 5 leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Claude Opus 5 has the higher overall point estimate 79.55 to 59.06. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in knowledge, where the averages are 81.4 for Claude Opus 5 and 60.4 for Inkling 2 Small.
- The biggest single benchmark swing is SWE-bench Verified in Coding, with scores of 96% and 82.2%.
- Inkling 2 Small is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Inkling 2 Small also has the larger context window at 1M.

## Model Snapshot

| Property | Claude Opus 5 | Inkling 2 Small |
|----------|----------|----------|
| Creator | Anthropic | Thinking Machines Lab |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Hybrid |
| Context | null | 1M |
| Overall Score | 79.55 | 59.06 |
| Benchmarks Covered | 83 | 25 |
| Pricing (input/output) | $5.00 / $25.00 | $0.30 / $1.00 |

## Category Breakdown

### Agentic

- Winner: Claude Opus 5
- Claude Opus 5 public-lane score: 76.9 (Supported · #4/131)
- Inkling 2 Small public-lane score: 59.9 (Supported · #26/131)

| Benchmark | Claude Opus 5 | Inkling 2 Small | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 42.7% | Coming soon | Coming soon |
| BrowseComp | 90.8% | 90.2% | Claude Opus 5 |
| HLE w/ tools | 64.7% | Coming soon | Coming soon |
| DeepSearchQA | 95.0% | 90.9% | Claude Opus 5 |
| DRACO | 88.6% | Coming soon | Coming soon |
| BrowseComp (10-agent, prerelease) | 93.6% | Coming soon | Coming soon |
| OSWorld 2.0 | 70.6% | Coming soon | Coming soon |
| MCP Atlas | 85.8% | 85% | Claude Opus 5 |
| MCP-Atlas claim coverage | 89.1% | Coming soon | Coming soon |
| LAB all-pass (Anthropic harness) | 23.58% | Coming soon | Coming soon |
| LAB criterion-pass (Anthropic harness) | 93.74% | Coming soon | Coming soon |
| LAB all-pass (Harvey held-out) | 11.7% | Coming soon | Coming soon |
| LAB criterion-pass (Harvey held-out) | 94.1% | Coming soon | Coming soon |
| Toolathlon-Verified | 80.6% | Coming soon | Coming soon |
| Toolathlon Verified Pass@3 | 87.0% | Coming soon | Coming soon |
| Toolathlon Verified Pass³ | 73.1% | Coming soon | Coming soon |
| Toolathlon Verified avg. turns | 23.5 turns | Coming soon | Coming soon |
| AutomationBench | 26.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 84.6% | Coming soon | Coming soon |
| ApprenticeBench | 36% | Coming soon | Coming soon |
| MazeBench | 12% | Coming soon | Coming soon |
| OSWorld 2.1 | 74.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.1% | Coming soon |
| JobBench | Coming soon | 70.5% | Coming soon |

### Coding

- Winner: Claude Opus 5
- Claude Opus 5 public-lane score: 70.6 (Supported · #9/157)
- Inkling 2 Small public-lane score: 59.7 (Supported · #20/157)

| Benchmark | Claude Opus 5 | Inkling 2 Small | Winner |
|-----------|-----------|-----------|--------|
| ScarfBench | 69.8% | Coming soon | Coming soon |
| Bug Hunt Bench | 27.0 fixes | Coming soon | Coming soon |
| SWE-bench Verified | 96% | 82.2% | Claude Opus 5 |
| SWE-bench Pro | 79.2% | Coming soon | Coming soon |
| SWE Multilingual | 89.5% | 81.2% | Claude Opus 5 |
| SWE Multimodal | 59.4% | Coming soon | Coming soon |
| DeepSWE | 68.8% | 72.1% | Inkling 2 Small |
| FrontierCode 1.1 Main | 53.4% | Coming soon | Coming soon |
| FrontierCode 1.1 Extended | 63.6% | Coming soon | Coming soon |
| FrontierSWE v2 | 52.0% | Coming soon | Coming soon |
| ProgramBench (episode 1) | 83.0% | Coming soon | Coming soon |
| ProgramBench | 93.0% | Coming soon | Coming soon |
| CursorBench 3.2 | 70.0% | Coming soon | Coming soon |
| VulcanBench v3 | 87.0% | Coming soon | Coming soon |
| VulcanBench CII v1 | 96.4% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 89.0% | Coming soon | Coming soon |
| SWE-bench (Vals) | 97.0% | Coming soon | Coming soon |
| CursorBench 4.0 | 46.6% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 35.0% | Coming soon | Coming soon |
| FrontierCode 2.0 | 26.7% | Coming soon | Coming soon |
| sweMarathon | Coming soon | 38.8% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.1% | Coming soon |
| PostTrainBench v1.2 | Coming soon | 31.9% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 5 public-lane score: 79.3 (#8/25)
- Inkling 2 Small public-lane score: 86.1 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 5 | Inkling 2 Small | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 90.4% | Coming soon | Coming soon |
| ARC-AGI-3 | 30.2% | Coming soon | Coming soon |
| LongBench v2 | Coming soon | 70.6% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Opus 5 public-lane score: 90.7 (#5/59)
- Inkling 2 Small public-lane score: 86.6 (#12/59)

| Benchmark | Claude Opus 5 | Inkling 2 Small | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 29.6% | 36.7% | Inkling 2 Small |
| Chartography (tools) | 83.0% | 80.4% | Claude Opus 5 |
| BenchCAD Vision2Code (no tools) | 0.366 | Coming soon | Coming soon |
| BenchCAD Vision2Code (tools) | 0.821 | Coming soon | Coming soon |
| GDP.pdf (no tools) | 83.4% | Coming soon | Coming soon |
| GDP.pdf (tools) | 85.5% | Coming soon | Coming soon |
| OfficeQA | 78.1% | Coming soon | Coming soon |
| OfficeQA Pro | 66.9% | Coming soon | Coming soon |
| CharXiv | Coming soon | 87.7% | Coming soon |
| CharXiv w/o tools | Coming soon | 85.6% | Coming soon |
| BabyVision | Coming soon | 68.6% | Coming soon |
| BabyVision w/ Python | Coming soon | 93.7% | Coming soon |
| ScreenSpot Pro | Coming soon | 83.8% | Coming soon |
| PerceptionBench | Coming soon | 64.7% | Coming soon |
| MathVision | Coming soon | 92.8% | Coming soon |

### Knowledge

- Winner: Directional only
- Claude Opus 5 public-lane score: 81.4 (Supported · #7/178)
- Inkling 2 Small public-lane score: 60.4 (Estimated · #46/178)

| Benchmark | Claude Opus 5 | Inkling 2 Small | Winner |
|-----------|-----------|-----------|--------|
| HLE | 64.7% | Coming soon | Coming soon |
| HLE w/o tools | 56.3% | Coming soon | Coming soon |
| HLE-Verified | 54.4% | Coming soon | Coming soon |
| LABBench2 | 84.2% | Coming soon | Coming soon |
| HealthBench (raw) | 67.1% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 57.8% | Coming soon | Coming soon |
| HealthBench Professional | 59.8% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 73.4% | Coming soon | Coming soon |
| BioMysteryBench (human-solvable) | 90.1% | Coming soon | Coming soon |
| BioMysteryBench (human-difficult) | 49.4% | Coming soon | Coming soon |
| SpatialBench Verified | 72.5% | Coming soon | Coming soon |
| SingleCellBench | 60.6% | Coming soon | Coming soon |
| ProteinGym Hard | 47.7% | Coming soon | Coming soon |
| Protein Design | 42.5% | Coming soon | Coming soon |
| Organic chemistry V2 | 61.6% | Coming soon | Coming soon |
| Protocols (troubleshooting) | 61.1% | Coming soon | Coming soon |
| Protocols (understanding) | 78.4% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 93.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 91.6% | Coming soon | Coming soon |
| GPQA | Coming soon | 93% | Coming soon |
| GPQA-D | Coming soon | 93.0% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Opus 5 public-lane score: Coming soon
- Inkling 2 Small public-lane score: Coming soon

| Benchmark | Claude Opus 5 | Inkling 2 Small | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 92.5% | Coming soon | Coming soon |
| MILU | 92.1% | Coming soon | Coming soon |
| INCLUDE | 89.8% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Opus 5 public-lane score: Coming soon
- Inkling 2 Small public-lane score: Coming soon

| Benchmark | Claude Opus 5 | Inkling 2 Small | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 4.6% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Opus 5 public-lane score: 88.1 (Unranked · 7 rankable rows)
- Inkling 2 Small public-lane score: 85.9 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 5 | Inkling 2 Small | Winner |
|-----------|-----------|-----------|--------|
| IMO 2026 | 42/42 | Coming soon | Coming soon |
| RiemannBench (no tools) | 60.0% | Coming soon | Coming soon |
| RiemannBench (tools) | 79.0% | Coming soon | Coming soon |
| ArXivMath Jun. 2026 (no tools) | 90.8% | Coming soon | Coming soon |
| ArXivMath Jun. 2026 (tools) | 91.3% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 85.614% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 73.171% | Coming soon | Coming soon |
| HMMT Feb 2026 | Coming soon | 95.8% | Coming soon |
| Apex | Coming soon | 63.5% | Coming soon |

## FAQ

### Which is better overall, Claude Opus 5 or Inkling 2 Small?

Claude Opus 5 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Opus 5 and Inkling 2 Small?

The widest category gap is in knowledge, where the averages are 81.4 for Claude Opus 5 and 60.4 for Inkling 2 Small.

### How many benchmarks does Claude Opus 5 cover on BenchLM?

Claude Opus 5 currently has 83 sourced benchmark scores on BenchLM.

### How many benchmarks does Inkling 2 Small cover on BenchLM?

Inkling 2 Small currently has 25 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 5 vs Inkling-Small](/compare/claude-opus-5-vs-inkling-small)
- [Inkling 2 Small vs Inkling-Small](/compare/inkling-2-small-vs-inkling-small)
- [Claude Opus 5 vs Inkling](/compare/claude-opus-5-vs-inkling)
- [Inkling 2 Small vs Inkling](/compare/inkling-vs-inkling-2-small)

## Explore More

- [Claude Opus 5 profile](/models/claude-opus-5)
- [Inkling 2 Small profile](/models/inkling-2-small)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)