Model comparison
Claude Haiku 5.5 vs GPT-5 Pro
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 46.4 on the Noometry Index.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Claude Haiku 5.5 scores higher in 2 categories and GPT-5 Pro in 2 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 5.5 leads 73.6 to 48.5.
- The biggest single-benchmark swing is FrontierMath Tier 4: 46.3% for Claude Haiku 5.5 and 19.5% for GPT-5 Pro.
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
- Claude Haiku 5.5 accepts more context: 1M tokens versus 400K.
Side by side
| Claude Haiku 5.5 | GPT-5 Pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 49.5 | 46.4 |
| Released | 2026-10-07 | 2025-10-06 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 400K |
| Max output | 128K | 272K |
| Input $ / M tokens | $0.10 | $15 |
| Output $ / M tokens | $0.50 | $120 |
| Results tracked | 9 | 12 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Claude Haiku 5.5 leads
Claude Haiku 5.5: 49.2 (#50), GPT-5 Pro: 44.0 (#80)
| Benchmark | Claude Haiku 5.5 | GPT-5 Pro |
|---|---|---|
| LMArena WebDev | 1587 | — |
| WeirdML | — | 60.4% |
| AlgoTune | — | 1.31 |
Reasoning GPT-5 Pro leads
Claude Haiku 5.5: 35.2 (#69), GPT-5 Pro: 38.9 (#62)
| Benchmark | Claude Haiku 5.5 | GPT-5 Pro |
|---|---|---|
| ARC-AGI-2 | — | 18.3% |
| SimpleBench | — | 61.6% |
| Kagi LLM Benchmark | — | 76.8% |
| NYT Connections (extended) | 65.7% | — |
| ARC-AGI-1 | — | 70.2% |
| EnigmaEval | — | 18.8% |
| Mystery Game Puzzles | 30% | — |
| Epoch Capabilities Index | — | 150.28 |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), GPT-5 Pro: 48.5 (#63)
| Benchmark | Claude Haiku 5.5 | GPT-5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | 55.8% |
| FrontierMath Tier 4 | 46.3% | 19.5% |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge GPT-5 Pro leads
Claude Haiku 5.5: 50.8 (#70), GPT-5 Pro: 56.7 (#42)
| Benchmark | Claude Haiku 5.5 | GPT-5 Pro |
|---|---|---|
| GPQA Diamond | 89.6% | — |
| Humanity's Last Exam | — | 31.6% |
| SimpleQA Verified | 23.8% | — |
Multimodal Not comparable
Claude Haiku 5.5: 43.7 (#21), GPT-5 Pro: —
| Benchmark | Claude Haiku 5.5 | GPT-5 Pro |
|---|---|---|
| Furniture Assembly | 47.5% | — |
Frequently asked questions
Is Claude Haiku 5.5 better than GPT-5 Pro?
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 46.4 on the Noometry Index.
Which is cheaper, Claude Haiku 5.5 or GPT-5 Pro?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; GPT-5 Pro lists at $15 and $120.
Is Claude Haiku 5.5 or GPT-5 Pro better for coding?
Claude Haiku 5.5 scores higher on coding benchmarks: 49.2 versus 44.0 in the Noometry coding category.
Which has the bigger context window?
Claude Haiku 5.5 does, with 1M tokens against 400K.
How many benchmarks do Claude Haiku 5.5 and GPT-5 Pro share?
2 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and GPT-5 Pro has 12.