Model comparison
Claude Haiku 5.5 vs Claude Opus 4
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 43.1 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 5 categories and Claude Opus 4 in 0 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 5.5 leads 73.6 to 42.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 98.9% for Claude Haiku 5.5 and 64.4% for Claude Opus 4.
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $15 / $75 for Claude Opus 4.
- Claude Haiku 5.5 accepts more context: 1M tokens versus 200K.
Side by side
| Claude Haiku 5.5 | Claude Opus 4 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 49.5 | 43.1 |
| Released | 2026-10-07 | 2025-05-22 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 200K |
| Max output | 128K | 32K |
| Input $ / M tokens | $0.10 | $15 |
| Output $ / M tokens | $0.50 | $75 |
| Results tracked | 9 | 56 |
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Category by category
Coding Claude Haiku 5.5 leads
Claude Haiku 5.5: 49.2 (#50), Claude Opus 4: 47.2 (#62)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| SWE-bench Verified | — | 70.7% |
| SWE-bench Verified (bash only) | — | 67.6% |
| Aider Polyglot | — | 72% |
| LMArena WebDev | 1587 | — |
| GSO | — | 6.9% |
| WeirdML | — | 43.7% |
| LMArena Coding | — | 1442 |
| AlgoTune | — | 1.33 |
Agentic & Tool Use Not comparable
Claude Haiku 5.5: —, Claude Opus 4: 34.8 (#42)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| Cybench | — | 38% |
| DeepResearch Bench | — | 46.8% |
| LMArena Search | — | 1127 |
| METR Time Horizons | — | 63.9% |
Reasoning Claude Haiku 5.5 leads
Claude Haiku 5.5: 35.2 (#69), Claude Opus 4: 27.3 (#121)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| ARC-AGI-2 | — | 8.6% |
| SimpleBench | — | 58.8% |
| Kagi LLM Benchmark | — | 74.3% |
| NYT Connections (extended) | 65.7% | — |
| ARC-AGI-1 | — | 35.7% |
| CritPt | — | 0.3% |
| EnigmaEval | — | 5.6% |
| LMArena Hard Prompts | — | 1399 |
| Mystery Game Puzzles | 30% | — |
| DTBench | — | 81.6% |
| LMCA | — | 37.4% |
| Epoch Capabilities Index | — | 142.67 |
| ForecastBench | — | 61.1 |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Claude Opus 4: 42.0 (#86)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.9% | 64.4% |
| FrontierMath (Tiers 1-3) | 75.1% | — |
| FrontierMath Tier 4 | 46.3% | — |
| Omni-MATH | — | 61.6% |
| LMArena Math | — | 1390 |
| MATH Level 5 | — | 85% |
| FrontierMath (Feb 2025 set) | — | 4.5% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Claude Haiku 5.5 leads
Claude Haiku 5.5: 50.8 (#70), Claude Opus 4: 44.0 (#88)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| GPQA Diamond | 89.6% | 76.3% |
| Humanity's Last Exam | — | 10.7% |
| SimpleQA Verified | 23.8% | — |
| MMLU-Pro | — | 87.5% |
| Confabulations | — | 15.9% |
| Vectara Hallucination Rate | — | 12% |
| GPQA (HELM) | — | 70.8% |
| LMArena Expert | — | 1386 |
Multimodal Claude Haiku 5.5 leads
Claude Haiku 5.5: 43.7 (#21), Claude Opus 4: 31.5 (#106)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| LMArena Vision | — | 1192 |
| GeoBench | — | 49% |
| VPCT | — | 38% |
| Furniture Assembly | 47.5% | — |
Multilingual Not comparable
Claude Haiku 5.5: —, Claude Opus 4: 48.8 (#138)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| LMArena Non-English | — | 1362 |
| LMArena Chinese | — | 1386 |
| LMArena French | — | 1372 |
| LMArena German | — | 1391 |
| LMArena Japanese | — | 1331 |
| LMArena Korean | — | 1321 |
| LMArena Russian | — | 1392 |
| LMArena Spanish | — | 1389 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Claude Opus 4: 77.1 (#28)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| IFEval | — | 91.8% |
| LMArena Instruction Following | — | 1406 |
Long Context Not comparable
Claude Haiku 5.5: —, Claude Opus 4: 39.6 (#172)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| Fiction.LiveBench | — | 61.1% |
| LMArena Longer Query | — | 1422 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Claude Opus 4: 61.2 (#89)
| Benchmark | Claude Haiku 5.5 | Claude Opus 4 |
|---|---|---|
| LMArena Text | — | 1377 |
| LMArena Creative Writing | — | 1387 |
| Short-Story Creative Writing | — | 83.6% |
| EQ-Bench Creative Writing | — | 1580 |
| WildBench | — | 85.2% |
| LMArena Multi-Turn | — | 1396 |
Frequently asked questions
Is Claude Haiku 5.5 better than Claude Opus 4?
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 43.1 on the Noometry Index.
Which is cheaper, Claude Haiku 5.5 or Claude Opus 4?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Claude Opus 4 lists at $15 and $75.
Is Claude Haiku 5.5 or Claude Opus 4 better for coding?
Claude Haiku 5.5 scores higher on coding benchmarks: 49.2 versus 47.2 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 Claude Opus 4 share?
2 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Claude Opus 4 has 56.