# Claude Opus 4.5 vs Ornith-1.5-35B-A3B

> Side-by-side benchmark comparison for Claude Opus 4.5 and Ornith-1.5-35B-A3B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-5-vs-ornith-1-5-35b-a3b
- Last updated: October 2, 2026

- Shared sourced benchmarks: 9
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Claude Opus 4.5 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 4.5 has the higher overall point estimate 55.66 to 32.61. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in coding, where the averages are 42.6 for Claude Opus 4.5 and 24 for Ornith-1.5-35B-A3B.
- The biggest single benchmark swing is MCP Atlas in Agentic, with scores of 42.3% and 70.2%.
- Ornith-1.5-35B-A3B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Ornith-1.5-35B-A3B also has the larger context window at 262K.

## Model Snapshot

| Property | Claude Opus 4.5 | Ornith-1.5-35B-A3B |
|----------|----------|----------|
| Creator | Anthropic | Ornith AI |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 262K |
| Overall Score | 55.66 | 32.61 |
| Benchmarks Covered | 45 | 18 |
| Pricing (input/output) | $5.00 / $25.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Opus 4.5 public-lane score: 31.1 (Estimated · #80/119)
- Ornith-1.5-35B-A3B public-lane score: 23.5 (Estimated · #95/119)

| Benchmark | Claude Opus 4.5 | Ornith-1.5-35B-A3B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59.3% | Coming soon | Coming soon |
| OSWorld-Verified | 66.3% | Coming soon | Coming soon |
| OSWorld | 66.3% | Coming soon | Coming soon |
| Claw-Eval | 59.6% | 72.5% | Ornith-1.5-35B-A3B |
| QwenClawBench | 52.3% | Coming soon | Coming soon |
| τ³-bench results | 70.2% | Coming soon | Coming soon |
| VITA-Bench | 23.3% | Coming soon | Coming soon |
| DeepPlanning | 26.4% | Coming soon | Coming soon |
| Toolathlon | 43.5% | Coming soon | Coming soon |
| MCP Atlas | 42.3% | 70.2% | Ornith-1.5-35B-A3B |
| MCP-Tasks | 71.8% | Coming soon | Coming soon |
| WideResearch | 76.4% | 67.8% | Claude Opus 4.5 |
| CyberGym | 50.6% | Coming soon | Coming soon |
| Gert Labs | 64.23% | Coming soon | Coming soon |
| JobBench | 32.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 67.8% | Coming soon |
| HLE w/ tools | Coming soon | 33.4% | Coming soon |
| Toolathlon-Verified | Coming soon | 48.7% | Coming soon |
| BrowseComp | Coming soon | 67.6% | Coming soon |

### Coding

- Winner: Directional only
- Claude Opus 4.5 public-lane score: 42.6 (Estimated · #59/144)
- Ornith-1.5-35B-A3B public-lane score: 24 (Estimated · #110/144)

| Benchmark | Claude Opus 4.5 | Ornith-1.5-35B-A3B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80.9% | 79% | Claude Opus 4.5 |
| LiveCodeBench v6 | 84.8% | Coming soon | Coming soon |
| SWE-bench Pro | 57.1% | 59.6% | Ornith-1.5-35B-A3B |
| SWE Multilingual | 77.5% | 71.4% | Claude Opus 4.5 |
| NL2Repo | 43.2% | 46.2% | Ornith-1.5-35B-A3B |
| Terminal-Bench 2.1 | Coming soon | 67.8% | Coming soon |
| DeepSWE | Coming soon | 22.0% | Coming soon |
| frontierBench | Coming soon | 5.1% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 73.3 (Unranked · 4 rankable rows)
- Ornith-1.5-35B-A3B public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Ornith-1.5-35B-A3B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 64.4% | Coming soon | Coming soon |
| AI-Needle | 74% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 24.5 (#47/49)
- Ornith-1.5-35B-A3B public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Ornith-1.5-35B-A3B | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 70.6% | Coming soon | Coming soon |
| MathVision | 74.3% | Coming soon | Coming soon |
| CharXiv | 68.5% | Coming soon | Coming soon |
| VideoMMMU | 84.4% | Coming soon | Coming soon |
| ScreenSpot Pro | 45.7% | Coming soon | Coming soon |
| V* | 67.0% | Coming soon | Coming soon |

### Knowledge

- Winner: Directional only
- Claude Opus 4.5 public-lane score: 49.6 (Estimated · #65/171)
- Ornith-1.5-35B-A3B public-lane score: 34.5 (Estimated · #119/171)

| Benchmark | Claude Opus 4.5 | Ornith-1.5-35B-A3B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87% | 89.2% | Ornith-1.5-35B-A3B |
| SuperGPQA | 70.6% | Coming soon | Coming soon |
| MMLU-Pro | 89.5% | Coming soon | Coming soon |
| MMLU-Redux | 96.6% | Coming soon | Coming soon |
| C-Eval | 92.2% | Coming soon | Coming soon |
| HLE | 30.8% | 25.6% | Claude Opus 4.5 |
| GPQA-D | Coming soon | 89.2% | Coming soon |
| HLE w/o tools | Coming soon | 25.6% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 96.5 (#2/16)
- Ornith-1.5-35B-A3B public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Ornith-1.5-35B-A3B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 85.7% | Coming soon | Coming soon |
| NOVA-63 | 56.7% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 30.6 (#115/125)
- Ornith-1.5-35B-A3B public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Ornith-1.5-35B-A3B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.9% | Coming soon | Coming soon |
| IFBench | 58% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 57.9 (#6/7)
- Ornith-1.5-35B-A3B public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Ornith-1.5-35B-A3B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 95.1% | Coming soon | Coming soon |
| HMMT Feb 2025 | 92.9% | Coming soon | Coming soon |
| HMMT Nov 2025 | 93.3% | Coming soon | Coming soon |
| HMMT Feb 2026 | 85.3% | Coming soon | Coming soon |
| MMAnswerBench | 84.0% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 20.690% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.167% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Opus 4.5 or Ornith-1.5-35B-A3B?

Claude Opus 4.5 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Opus 4.5 and Ornith-1.5-35B-A3B?

The widest category gap is in coding, where the averages are 42.6 for Claude Opus 4.5 and 24 for Ornith-1.5-35B-A3B.

### How many benchmarks does Claude Opus 4.5 cover on BenchLM?

Claude Opus 4.5 currently has 45 sourced benchmark scores on BenchLM.

### How many benchmarks does Ornith-1.5-35B-A3B cover on BenchLM?

Ornith-1.5-35B-A3B currently has 18 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 4.5 vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-vs-claude-opus-4-5-thinking)
- [Ornith-1.5-35B-A3B vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-thinking-vs-ornith-1-5-35b-a3b)
- [Claude Opus 4.5 vs Ornith-1.5-397B](/compare/claude-opus-4-5-vs-ornith-1-5-397b)
- [Ornith-1.5-35B-A3B vs Ornith-1.5-397B](/compare/ornith-1-5-35b-a3b-vs-ornith-1-5-397b)

## Explore More

- [Claude Opus 4.5 profile](/models/claude-opus-4-5)
- [Ornith-1.5-35B-A3B profile](/models/ornith-1-5-35b-a3b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)