Model comparison
Claude 2 vs Claude Haiku 4.5
Claude Haiku 4.5 is the stronger model overall, scoring 39.5 to 25.0 on the Noometry Index.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. Claude 2 scores higher in 1 category and Claude Haiku 4.5 in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 4.5 leads 44.9 to 9.3.
- The biggest single-benchmark swing is MATH Level 5: 11.7% for Claude 2 and 96.4% for Claude Haiku 4.5.
Side by side
| Claude 2 | Claude Haiku 4.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 25.0 | 39.5 |
| Released | 2023-07-11 | 2025-10-15 |
| Weights | Proprietary | Proprietary |
| Context window | — | 200K |
| Max output | — | 64K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $5 |
| Results tracked | 8 | 53 |
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Category by category
Coding Not comparable
Claude 2: —, Claude Haiku 4.5: 44.0 (#78)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66.6% |
| LMArena WebDev | — | 1330 |
| SWE-bench Multilingual | — | 64.7% |
| SciCode | — | 43.3% |
| WeirdML | — | 45.4% |
| LMArena Coding | — | 1453 |
| ALE-Bench | — | 653.48 |
| HumanEval+ | 61.6% | — |
Agentic & Tool Use Not comparable
Claude 2: —, Claude Haiku 4.5: 33.6 (#52)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| Terminal-Bench | — | 35.5% |
| Berkeley Function Calling Leaderboard | — | 68.7% |
| DeepResearch Bench | — | 45.5% |
| BALROG | — | 31.2% |
| ExploitBench | — | 13.7% |
| Vending-Bench 2 | — | 458.89 |
Reasoning Claude 2 leads
Claude 2: 21.7 (#216), Claude Haiku 4.5: 15.1 (#320)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| DTBench | 51.9% | 73.6% |
| Epoch Capabilities Index | 120.13 | 142.41 |
| ARC-AGI-2 | — | 4% |
| NYT Connections (extended) | — | 14.3% |
| ARC-AGI-1 | — | 47.7% |
| CritPt | — | 0% |
| Chess Puzzles | — | 8% |
| LMArena Hard Prompts | — | 1420 |
| LMCA | — | 30.9% |
| ForecastBench | — | 61.4 |
Math Claude Haiku 4.5 leads
Claude 2: 9.3 (#320), Claude Haiku 4.5: 44.9 (#78)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 66.7% |
| MATH Level 5 | 11.7% | 96.4% |
| Omni-MATH | — | 56.1% |
| LMArena Math | — | 1396 |
| FrontierMath (Feb 2025 set) | — | 5.9% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Claude Haiku 4.5 leads
Claude 2: 16.9 (#287), Claude Haiku 4.5: 37.7 (#153)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| GPQA Diamond | 34.7% | 71.2% |
| SimpleQA Verified | — | 13.2% |
| MMLU-Pro | — | 77.7% |
| Vectara Hallucination Rate | — | 9.8% |
| GPQA (HELM) | — | 60.5% |
| LMArena Expert | — | 1442 |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |
Multimodal Not comparable
Claude 2: —, Claude Haiku 4.5: 26.8 (#118)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| Blueprint-Bench 2 | — | 0% |
| LMArena Document | — | 1420 |
Multilingual Not comparable
Claude 2: —, Claude Haiku 4.5: 49.9 (#129)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| LMArena Non-English | — | 1377 |
| LMArena Chinese | — | 1417 |
| LMArena French | — | 1408 |
| LMArena German | — | 1375 |
| LMArena Japanese | — | 1339 |
| LMArena Korean | — | 1347 |
| LMArena Russian | — | 1381 |
| LMArena Spanish | — | 1420 |
Instruction Following Not comparable
Claude 2: —, Claude Haiku 4.5: 71.4 (#149)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| IFEval | — | 80.1% |
| LMArena Instruction Following | — | 1414 |
Long Context Not comparable
Claude 2: —, Claude Haiku 4.5: 43.6 (#92)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| LMArena Longer Query | — | 1427 |
Writing & Preference Not comparable
Claude 2: —, Claude Haiku 4.5: 57.9 (#123)
| Benchmark | Claude 2 | Claude Haiku 4.5 |
|---|---|---|
| LMArena Text | — | 1396 |
| LMArena Creative Writing | — | 1372 |
| WildBench | — | 83.9% |
| EQ-Bench 4 | — | 1064 |
| LMArena Multi-Turn | — | 1409 |
Frequently asked questions
Is Claude 2 better than Claude Haiku 4.5?
Claude Haiku 4.5 is the stronger model overall, scoring 39.5 to 25.0 on the Noometry Index.
How many benchmarks do Claude 2 and Claude Haiku 4.5 share?
5 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and Claude Haiku 4.5 has 53.