# Claude Haiku 5.5 vs o3

> Side-by-side benchmark comparison for Claude Haiku 5.5 and o3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-haiku-5-5-vs-o3
- Last updated: October 7, 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 Claude Haiku 5.5 and o3.

## Summary

- Claude Haiku 5.5 and o3 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 | Claude Haiku 5.5 | o3 |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 200K |
| Independent public score (not head-to-head) | 66.32 | 46 |
| Benchmarks Covered | 5 | 2 |
| Pricing (input/output) | $0.10 / $0.50 | $2.00 / $8.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: 62.1 (Supported · #18/122)
- o3 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | o3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 39.20% | Coming soon | Coming soon |
| HLE w/ tools | 57.4% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: 60.9 (Supported · #20/146)
- o3 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | o3 | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 46.4% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: 79.2 (Unranked · 2 rankable rows)
- o3 public-lane score: 73.7 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: Coming soon
- o3 public-lane score: 64.4 (Unranked · 1 rankable row)

| Benchmark | Claude Haiku 5.5 | o3 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 46.4% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: Coming soon
- o3 public-lane score: 47.2 (Estimated · #82/174)

| Benchmark | Claude Haiku 5.5 | o3 | Winner |
|-----------|-----------|-----------|--------|
| HLE w/o tools | 45.9% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: Coming soon
- o3 public-lane score: 86 (#34/125)

### Mathematics

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: Coming soon
- o3 public-lane score: 37.7 (Unranked · 2 rankable rows)

| Benchmark | Claude Haiku 5.5 | o3 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 18.685% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 2.083% | Coming soon |

## FAQ

### Can I compare Claude Haiku 5.5 and o3 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

- [Claude Haiku 5.5 vs o3-pro](/compare/claude-haiku-5-5-vs-o3-pro)
- [o3 vs o3-pro](/compare/o3-vs-o3-pro)
- [Claude Haiku 5.5 vs o3-mini](/compare/claude-haiku-5-5-vs-o3-mini)
- [o3 vs o3-mini](/compare/o3-vs-o3-mini)

## Explore More

- [Claude Haiku 5.5 profile](/models/claude-haiku-5-5)
- [o3 profile](/models/o3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)