# Claude Haiku 4.5 vs Solar Open 2

> Side-by-side benchmark comparison for Claude Haiku 4.5 and Solar Open 2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-haiku-4-5-vs-solar-open-2
- Last updated: September 10, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Haiku 4.5 and Solar Open 2 share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Solar Open 2 has the lower published output-token price.
- Solar Open 2 has the larger published context window at 1M.

## Model Snapshot

| Property | Claude Haiku 4.5 | Solar Open 2 |
|----------|----------|----------|
| Creator | Anthropic | Upstage |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Independent public score (not head-to-head) | 52.79 | null |
| Benchmarks Covered | 10 | 11 |
| Pricing (input/output) | $1.00 / $5.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Haiku 4.5 public-lane score: 27 (Supported · #142/152)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Claude Haiku 4.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| JobBench | 16.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 43.8% | Coming soon | Coming soon |
| terminalBenchHard | Coming soon | 28.3% | Coming soon |
| APEX-Agents | Coming soon | 16.6% | Coming soon |
| MCP Atlas | Coming soon | 58.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Haiku 4.5 public-lane score: 27.2 (Supported · #144/151)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Claude Haiku 4.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 73.3% | 70.4% | Claude Haiku 4.5 |
| VulcanBench v3 | 76.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 41.2% | Coming soon | Coming soon |
| SWE-bench (Vals) | 66.6% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 92.4% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Haiku 4.5 public-lane score: 44.2 (Estimated · #115/183)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Claude Haiku 4.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 72.2% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 78.7% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 86.2% | Coming soon |
| GPQA-D | Coming soon | 86.3% | Coming soon |
| HLE w/o tools | Coming soon | 28.8% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Haiku 4.5 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Claude Haiku 4.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 80% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Haiku 4.5 public-lane score: 28.9 (Unranked · 2 rankable rows)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Claude Haiku 4.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 5.903% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 2.083% | Coming soon | Coming soon |
| HMMT Feb 2026 | Coming soon | 93.9% | Coming soon |
| AIME26 | Coming soon | 95.7% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Haiku 4.5 and Solar Open 2?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude Haiku 4.5 vs Claude Haiku 4.5 Thinking](/compare/claude-haiku-4-5-vs-claude-haiku-4-5-thinking)
- [Solar Open 2 vs Claude Haiku 4.5 Thinking](/compare/claude-haiku-4-5-thinking-vs-solar-open-2)
- [Claude Haiku 4.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-haiku-4-5)
- [Solar Open 2 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-solar-open-2)

## Explore More

- [Claude Haiku 4.5 profile](/models/claude-haiku-4-5)
- [Solar Open 2 profile](/models/solar-open-2)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)