Model comparison
Claude Haiku 5.5 vs o3-pro
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 42.9 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in knowledge, where Claude Haiku 5.5 leads 50.8 to 29.5.
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $20 / $80 for o3-pro.
- Claude Haiku 5.5 accepts more context: 1M tokens versus 200K.
Side by side
| Claude Haiku 5.5 | o3-pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 49.5 | 42.9 |
| Released | 2026-10-07 | 2025-06-10 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 200K |
| Max output | 128K | 100K |
| Input $ / M tokens | $0.10 | $20 |
| Output $ / M tokens | $0.50 | $80 |
| Results tracked | 9 | 12 |
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Category by category
Coding o3-pro leads
Claude Haiku 5.5: 49.2 (#50), o3-pro: 55.5 (#24)
| Benchmark | Claude Haiku 5.5 | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| LMArena WebDev | 1587 | — |
| WeirdML | — | 58.2% |
Reasoning Claude Haiku 5.5 leads
Claude Haiku 5.5: 35.2 (#69), o3-pro: 23.8 (#171)
| Benchmark | Claude Haiku 5.5 | o3-pro |
|---|---|---|
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| NYT Connections (extended) | 65.7% | — |
| ARC-AGI-1 | — | 59.3% |
| Mystery Game Puzzles | 30% | — |
| DTBench | — | 86.9% |
| LMCA | — | 38.5% |
| Epoch Capabilities Index | — | 147.42 |
Math Not comparable
Claude Haiku 5.5: 73.6 (#18), o3-pro: —
| Benchmark | Claude Haiku 5.5 | o3-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | — |
| FrontierMath Tier 4 | 46.3% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
Knowledge Claude Haiku 5.5 leads
Claude Haiku 5.5: 50.8 (#70), o3-pro: 29.5 (#238)
| Benchmark | Claude Haiku 5.5 | o3-pro |
|---|---|---|
| GPQA Diamond | 89.6% | — |
| SimpleQA Verified | 23.8% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
Multimodal Not comparable
Claude Haiku 5.5: 43.7 (#21), o3-pro: —
| Benchmark | Claude Haiku 5.5 | o3-pro |
|---|---|---|
| Furniture Assembly | 47.5% | — |
Long Context Not comparable
Claude Haiku 5.5: —, o3-pro: 72.2 (#1)
| Benchmark | Claude Haiku 5.5 | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
Writing & Preference Not comparable
Claude Haiku 5.5: —, o3-pro: 57.1 (#133)
| Benchmark | Claude Haiku 5.5 | o3-pro |
|---|---|---|
| Short-Story Creative Writing | — | 84.4% |
Frequently asked questions
Is Claude Haiku 5.5 better than o3-pro?
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 42.9 on the Noometry Index.
Which is cheaper, Claude Haiku 5.5 or o3-pro?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; o3-pro lists at $20 and $80.
Is Claude Haiku 5.5 or o3-pro better for coding?
o3-pro scores higher on coding benchmarks: 55.5 versus 49.2 in the Noometry coding category.
Which has the bigger context window?
Claude Haiku 5.5 does, with 1M tokens against 200K.
How many benchmarks do Claude Haiku 5.5 and o3-pro share?
0 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and o3-pro has 12.