# Claude Opus 4.5 vs Ternary Bonsai 2 27B

> Side-by-side benchmark comparison for Claude Opus 4.5 and Ternary Bonsai 2 27B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-5-vs-ternary-bonsai-2-27b
- Last updated: September 18, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Claude Opus 4.5 if you want the stronger benchmark profile. Ternary Bonsai 2 27B only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Opus 4.5 leads overall 58.42 to 50.78.
- The clearest category separation is in instruction following, where the averages are 30.6 for Claude Opus 4.5 and 71 for Ternary Bonsai 2 27B.
- The biggest single benchmark swing is SWE-bench Verified in Coding, with scores of 80.9% and 60.8%.
- Ternary Bonsai 2 27B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Ternary Bonsai 2 27B also has the larger context window at 262K.

## Model Snapshot

| Property | Claude Opus 4.5 | Ternary Bonsai 2 27B |
|----------|----------|----------|
| Creator | Anthropic | Prism ML |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 262K |
| Overall Score | 58.42 | 50.78 |
| Benchmarks Covered | 45 | 21 |
| Pricing (input/output) | $5.00 / $25.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 43.2 (Estimated · #102/154)
- Ternary Bonsai 2 27B public-lane score: 49.9 (Estimated · #59/154)

| Benchmark | Claude Opus 4.5 | Ternary Bonsai 2 27B | 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% | Coming soon | Coming soon |
| 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% | Coming soon | Coming soon |
| MCP-Tasks | 71.8% | Coming soon | Coming soon |
| WideResearch | 76.4% | Coming soon | Coming soon |
| CyberGym | 50.6% | Coming soon | Coming soon |
| Gert Labs | 64.23% | Coming soon | Coming soon |
| JobBench | 32.3% | Coming soon | Coming soon |
| τ²-bench results | Coming soon | 80.2% | Coming soon |
| BFCL v3 | Coming soon | 74.9% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 52.8% | Coming soon |

### Coding

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 56.7 (Estimated · #36/154)
- Ternary Bonsai 2 27B public-lane score: 49.9 (Estimated · #64/154)

| Benchmark | Claude Opus 4.5 | Ternary Bonsai 2 27B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80.9% | 60.8% | Claude Opus 4.5 |
| LiveCodeBench v6 | 84.8% | 90.1% | Ternary Bonsai 2 27B |
| SWE-bench Pro | 57.1% | Coming soon | Coming soon |
| SWE Multilingual | 77.5% | Coming soon | Coming soon |
| NL2Repo | 43.2% | Coming soon | Coming soon |
| BigCodeBench | Coming soon | 58.1% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 52.8% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 23.5 (#46/48)
- Ternary Bonsai 2 27B public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Ternary Bonsai 2 27B | 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 |
| CharXiv (overall) | Coming soon | 80.0% | Coming soon |
| A-OKVQA | Coming soon | 86.8% | Coming soon |
| OmniDocBench 1.6 | Coming soon | 89.1% | Coming soon |
| RealWorldQA | Coming soon | 80.1% | Coming soon |
| OCRBench V2 | Coming soon | 56.9% | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 72.1 (Unranked · 4 rankable rows)
- Ternary Bonsai 2 27B public-lane score: 73.9 (Unranked · 1 rankable row)

| Benchmark | Claude Opus 4.5 | Ternary Bonsai 2 27B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 64.4% | Coming soon | Coming soon |
| AI-Needle | 74% | Coming soon | Coming soon |

### Knowledge

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 54 (Estimated · #60/184)
- Ternary Bonsai 2 27B public-lane score: 50.6 (Estimated · #78/184)

| Benchmark | Claude Opus 4.5 | Ternary Bonsai 2 27B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87% | 85.8% | Claude Opus 4.5 |
| SuperGPQA | 70.6% | Coming soon | Coming soon |
| MMLU-Pro | 89.5% | Coming soon | Coming soon |
| MMLU-Redux | 96.6% | 89.1% | Claude Opus 4.5 |
| C-Eval | 92.2% | Coming soon | Coming soon |
| HLE | 30.8% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 85.8% | Coming soon |

### Instruction Following

- Winner: Ternary Bonsai 2 27B
- Claude Opus 4.5 public-lane score: 30.6 (#114/124)
- Ternary Bonsai 2 27B public-lane score: 71 (#64/124)

| Benchmark | Claude Opus 4.5 | Ternary Bonsai 2 27B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.9% | 91.3% | Ternary Bonsai 2 27B |
| IFBench | 58% | 74% | Ternary Bonsai 2 27B |

### Multilingual

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 82.9 (#2/12)
- Ternary Bonsai 2 27B public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Ternary Bonsai 2 27B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 85.7% | Coming soon | Coming soon |
| NOVA-63 | 56.7% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 57.9 (#6/7)
- Ternary Bonsai 2 27B public-lane score: 76.8 (Unranked · 4 rankable rows)

| Benchmark | Claude Opus 4.5 | Ternary Bonsai 2 27B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 95.1% | 95.8% | Ternary Bonsai 2 27B |
| 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 |
| GSM8K | Coming soon | 96.7% | Coming soon |
| MATH-500 | Coming soon | 98.8% | Coming soon |
| AIME 2025 | Coming soon | 95% | Coming soon |

## FAQ

### Which is better overall, Claude Opus 4.5 or Ternary Bonsai 2 27B?

Claude Opus 4.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 4.5 and Ternary Bonsai 2 27B?

The widest category gap is in instruction following, where the averages are 30.6 for Claude Opus 4.5 and 71 for Ternary Bonsai 2 27B.

### 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 Ternary Bonsai 2 27B cover on BenchLM?

Ternary Bonsai 2 27B currently has 21 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)
- [Ternary Bonsai 2 27B vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-thinking-vs-ternary-bonsai-2-27b)
- [Claude Opus 4.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-4-5)
- [Ternary Bonsai 2 27B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-ternary-bonsai-2-27b)

## Explore More

- [Claude Opus 4.5 profile](/models/claude-opus-4-5)
- [Ternary Bonsai 2 27B profile](/models/ternary-bonsai-2-27b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)