Model comparison
Claude Haiku 5.5 vs Claude Opus 5.5
Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 49.5 on the Noometry Index. Claude Haiku 5.5 costs 40× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.
Last verified . 9 shared benchmarks.
Summary
- They share 9 benchmarks with published results for both. Claude Haiku 5.5 scores higher in 0 categories and Claude Opus 5.5 in 5 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 35.2.
- The biggest single-benchmark swing is FrontierMath Tier 4: 46.3% for Claude Haiku 5.5 and 95% for Claude Opus 5.5.
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
Side by side
| Claude Haiku 5.5 | Claude Opus 5.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 49.5 | 68.6 |
| Released | 2026-10-07 | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Max output | 128K | 128K |
| Input $ / M tokens | $0.10 | $4 |
| Output $ / M tokens | $0.50 | $20 |
| Results tracked | 9 | 44 |
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Category by category
Coding Claude Opus 5.5 leads
Claude Haiku 5.5: 49.2 (#50), Claude Opus 5.5: 71.9 (#3)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| LMArena WebDev | 1587 | 1813 |
| FrontierCode | — | 54.6% |
| CursorBench | — | 57.8% |
| FrontierSWE | — | 62.3% |
| SciCode | — | 66.9% |
| LMArena Coding | — | 1547 |
| MirrorCode | — | 77.4% |
| ALE-Bench | — | 2,147 |
Agentic & Tool Use Not comparable
Claude Haiku 5.5: —, Claude Opus 5.5: 45.3 (#15)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| APEX-Agents | — | 73.5% |
| GDP.pdf | — | 30.6% |
| Vending-Bench 2 | — | 9,235 |
Reasoning Claude Opus 5.5 leads
Claude Haiku 5.5: 35.2 (#69), Claude Opus 5.5: 80.2 (#3)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| NYT Connections (extended) | 65.7% | 88.5% |
| Mystery Game Puzzles | 30% | 71% |
| ARC-AGI-2 | — | 93.3% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 31.7% |
| EBR-Bench | — | 71.4% |
| LMArena Hard Prompts | — | 1535 |
| DTBench | — | 98.9% |
| LMCA | — | 68.2% |
| Epoch Capabilities Index | — | 167.33 |
Math Claude Opus 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Claude Opus 5.5: 91.8 (#3)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | 91.2% |
| FrontierMath Tier 4 | 46.3% | 95% |
| OTIS Mock AIME 2024-2025 | 98.9% | 100% |
| ProofBench | — | 100% |
| LMArena Math | — | 1506 |
| FrontierMath Erdős | — | 2.9% |
Knowledge Claude Opus 5.5 leads
Claude Haiku 5.5: 50.8 (#70), Claude Opus 5.5: 66.4 (#10)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| GPQA Diamond | 89.6% | 90.6% |
| SimpleQA Verified | 23.8% | 72.2% |
| LMArena Expert | — | 1547 |
Multimodal Claude Opus 5.5 leads
Claude Haiku 5.5: 43.7 (#21), Claude Opus 5.5: 57.8 (#1)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| Furniture Assembly | 47.5% | 83.3% |
| LMArena Vision | — | 1321 |
| Blueprint-Bench 2 | — | 51.2% |
Multilingual Not comparable
Claude Haiku 5.5: —, Claude Opus 5.5: 59.1 (#2)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| LMArena Non-English | — | 1507 |
| LMArena Chinese | — | 1588 |
| LMArena French | — | 1514 |
| LMArena Russian | — | 1520 |
| LMArena Spanish | — | 1507 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Claude Opus 5.5: 80.0 (#3)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| LMArena Instruction Following | — | 1537 |
Long Context Not comparable
Claude Haiku 5.5: —, Claude Opus 5.5: 47.1 (#19)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| LMArena Longer Query | — | 1532 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Claude Opus 5.5: 78.2 (#3)
| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| LMArena Text | — | 1515 |
| LMArena Creative Writing | — | 1533 |
| EQ-Bench Creative Writing | — | 2050 |
| LMArena Multi-Turn | — | 1499 |
Frequently asked questions
Is Claude Haiku 5.5 better than Claude Opus 5.5?
Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 49.5 on the Noometry Index. Claude Haiku 5.5 costs 40× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.
Which is cheaper, Claude Haiku 5.5 or Claude Opus 5.5?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Claude Opus 5.5 lists at $4 and $20.
Is Claude Haiku 5.5 or Claude Opus 5.5 better for coding?
Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 49.2 in the Noometry coding category.
Which has the bigger context window?
Both accept 1M tokens.
How many benchmarks do Claude Haiku 5.5 and Claude Opus 5.5 share?
9 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Claude Opus 5.5 has 44.