Model comparison
Claude Haiku 5.5 vs GPT-5.5 Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 49.5 on the Noometry Index. Claude Haiku 5.5 costs 338× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 4 shared benchmarks.
Summary
- They share 4 benchmarks with published results for both. Claude Haiku 5.5 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 reasoning, where GPT-5.5 Pro leads 73.3 to 35.2.
- The biggest single-benchmark swing is FrontierMath Tier 4: 46.3% for Claude Haiku 5.5 and 78% for GPT-5.5 Pro.
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 1M.
Side by side
| Claude Haiku 5.5 | GPT-5.5 Pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 49.5 | 64.3 |
| Released | 2026-10-07 | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1.05M |
| Max output | 128K | 128K |
| Input $ / M tokens | $0.10 | $30 |
| Output $ / M tokens | $0.50 | $180 |
| Results tracked | 9 | 14 |
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Category by category
Coding Not comparable
Claude Haiku 5.5: 49.2 (#50), GPT-5.5 Pro: —
| Benchmark | Claude Haiku 5.5 | GPT-5.5 Pro |
|---|---|---|
| LMArena WebDev | 1587 | — |
Reasoning GPT-5.5 Pro leads
Claude Haiku 5.5: 35.2 (#69), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | Claude Haiku 5.5 | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| NYT Connections (extended) | 65.7% | — |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| Mystery Game Puzzles | 30% | — |
| DTBench | — | 96% |
| LMCA | — | 53.9% |
| Epoch Capabilities Index | — | 162.07 |
Math GPT-5.5 Pro leads
Claude Haiku 5.5: 73.6 (#18), GPT-5.5 Pro: 84.0 (#10)
| Benchmark | Claude Haiku 5.5 | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | 87.7% |
| FrontierMath Tier 4 | 46.3% | 78% |
| OTIS Mock AIME 2024-2025 | 98.9% | 100% |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
Knowledge GPT-5.5 Pro leads
Claude Haiku 5.5: 50.8 (#70), GPT-5.5 Pro: 64.1 (#19)
| Benchmark | Claude Haiku 5.5 | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 89.6% | 93.9% |
| SimpleQA Verified | 23.8% | — |
Multimodal Not comparable
Claude Haiku 5.5: 43.7 (#21), GPT-5.5 Pro: —
| Benchmark | Claude Haiku 5.5 | GPT-5.5 Pro |
|---|---|---|
| Furniture Assembly | 47.5% | — |
Frequently asked questions
Is Claude Haiku 5.5 better than GPT-5.5 Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 49.5 on the Noometry Index. Claude Haiku 5.5 costs 338× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, Claude Haiku 5.5 or GPT-5.5 Pro?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 1M.
How many benchmarks do Claude Haiku 5.5 and GPT-5.5 Pro share?
4 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and GPT-5.5 Pro has 14.