# Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) vs CompassJudger-1-1.5B (JudgeBench)

> Side-by-side benchmark comparison for Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) and CompassJudger-1-1.5B (JudgeBench) across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/native-judgebench-arena-hard-o3-mini-2025-01-31-medium-vs-native-judgebench-compassjudger-1-1-5b
- Last updated: October 1, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) and CompassJudger-1-1.5B (JudgeBench).

## Summary

- Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) and CompassJudger-1-1.5B (JudgeBench) do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) | CompassJudger-1-1.5B (JudgeBench) |
|----------|----------|----------|
| Creator | JudgeBench authors | OpenCompass |
| Type | Evaluated configuration | Open Weight |
| Reasoning | Unspecified | Unspecified |
| Context | null | null |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 0 | 0 |
| Pricing (input/output) | Pricing unavailable / Pricing unavailable | Pricing unavailable / Pricing unavailable |

## Category Breakdown

## FAQ

### Can I compare Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) and CompassJudger-1-1.5B (JudgeBench) on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) vs GPT-6 Astra](/compare/gpt-6-astra-vs-native-judgebench-arena-hard-o3-mini-2025-01-31-medium)
- [CompassJudger-1-1.5B (JudgeBench) vs GPT-6 Astra](/compare/gpt-6-astra-vs-native-judgebench-compassjudger-1-1-5b)
- [Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-native-judgebench-arena-hard-o3-mini-2025-01-31-medium)
- [CompassJudger-1-1.5B (JudgeBench) vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-native-judgebench-compassjudger-1-1-5b)

## Explore More

- [Arena-Hard (o3-mini-2025-01-31 (medium)) (JudgeBench) profile](/models/native-judgebench-arena-hard-o3-mini-2025-01-31-medium)
- [CompassJudger-1-1.5B (JudgeBench) profile](/models/native-judgebench-compassjudger-1-1-5b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)