Model comparison
Claude 3 Haiku vs GPT-5.5 Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 25.7 on the Noometry Index.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. Claude 3 Haiku scores higher in 0 categories and GPT-5.5 Pro in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 83.8 to 9.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 1.8% for Claude 3 Haiku and 100% for GPT-5.5 Pro.
Side by side
| Claude 3 Haiku | GPT-5.5 Pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 25.7 | 64.3 |
| Released | 2024-03-07 | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 128K |
| Input $ / M tokens | — | $30 |
| Output $ / M tokens | — | $180 |
| Results tracked | 37 | 14 |
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Category by category
Coding Not comparable
Claude 3 Haiku: 26.1 (#320), GPT-5.5 Pro: —
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| WeirdML | 9.8% | — |
| BigCodeBench Instruct | 39.4% | — |
| LMArena Coding | 1199 | — |
| BigCodeBench Complete | 50.1% | — |
| CadEval | 12% | — |
| HumanEval+ | 68.9% | — |
| MBPP+ | 68.8% | — |
Reasoning GPT-5.5 Pro leads
Claude 3 Haiku: 15.7 (#303), GPT-5.5 Pro: 73.6 (#7)
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| DTBench | 50.1% | 96% |
| LMCA | 8.8% | 53.9% |
| Epoch Capabilities Index | 118.3 | 162.45 |
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| Kagi LLM Benchmark | 34.2% | — |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| LMArena Hard Prompts | 1174 | — |
| ForecastBench | 53.2 | — |
| WinoGrande | 74.2% | — |
Math GPT-5.5 Pro leads
Claude 3 Haiku: 9.2 (#313), GPT-5.5 Pro: 83.8 (#8)
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.8% | 100% |
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| LMArena Math | 1188 | — |
| MATH Level 5 | 14.9% | — |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
Knowledge GPT-5.5 Pro leads
Claude 3 Haiku: 17.3 (#280), GPT-5.5 Pro: 64.2 (#17)
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 36.3% | 93.9% |
| Confabulations | 34.2% | — |
| LMArena Expert | 1148 | — |
| MMLU | 73.8% | — |
Multimodal Not comparable
Claude 3 Haiku: 23.1 (#123), GPT-5.5 Pro: —
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 950 | — |
| ScienceQA | 72% | — |
Multilingual Not comparable
Claude 3 Haiku: 36.1 (#238), GPT-5.5 Pro: —
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1178 | — |
| LMArena Chinese | 1155 | — |
| LMArena French | 1194 | — |
| LMArena German | 1174 | — |
| LMArena Japanese | 1102 | — |
| LMArena Korean | 1108 | — |
| LMArena Russian | 1204 | — |
| LMArena Spanish | 1165 | — |
Instruction Following Not comparable
Claude 3 Haiku: 61.5 (#242), GPT-5.5 Pro: —
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1174 | — |
Long Context Not comparable
Claude 3 Haiku: 36.1 (#232), GPT-5.5 Pro: —
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1191 | — |
Writing & Preference Not comparable
Claude 3 Haiku: 29.8 (#286), GPT-5.5 Pro: —
| Benchmark | Claude 3 Haiku | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1195 | — |
| LMArena Creative Writing | 1157 | — |
| EQ-Bench Creative Writing | 717 | — |
| LMArena Multi-Turn | 1190 | — |
Frequently asked questions
Is Claude 3 Haiku better than GPT-5.5 Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 25.7 on the Noometry Index.
How many benchmarks do Claude 3 Haiku and GPT-5.5 Pro share?
5 benchmarks have published results for both models. Claude 3 Haiku has 37 scored results on Noometry and GPT-5.5 Pro has 14.