Model comparison
Claude 2 vs GPT-5 Nano
GPT-5 Nano is the stronger model overall, scoring 33.5 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 GPT-5 Nano in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5 Nano leads 29.4 to 9.3.
- The biggest single-benchmark swing is MATH Level 5: 11.7% for Claude 2 and 95.2% for GPT-5 Nano.
Side by side
| Claude 2 | GPT-5 Nano | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 25.0 | 33.5 |
| Released | 2023-07-11 | 2025-08-07 |
| Weights | Proprietary | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $0.05 |
| Output $ / M tokens | — | $0.40 |
| Results tracked | 8 | 49 |
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Category by category
Coding Not comparable
Claude 2: —, GPT-5 Nano: 33.6 (#254)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| SWE-bench Verified (bash only) | — | 34.8% |
| WeirdML | — | 38.1% |
| LMArena Coding | — | 1351 |
| ALE-Bench | — | 718.67 |
| HumanEval+ | 61.6% | — |
Agentic & Tool Use Not comparable
Claude 2: —, GPT-5 Nano: 25.8 (#106)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| Terminal-Bench | — | 21.8% |
| Berkeley Function Calling Leaderboard | — | 51.5% |
Reasoning Claude 2 leads
Claude 2: 21.7 (#216), GPT-5 Nano: 16.3 (#306)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| DTBench | 51.9% | 62.7% |
| Epoch Capabilities Index | 120.13 | 139.38 |
| ARC-AGI-2 | — | 2.6% |
| Kagi LLM Benchmark | — | 62.2% |
| ARC-AGI-1 | — | 20.7% |
| Chess Puzzles | — | 27% |
| LMArena Hard Prompts | — | 1328 |
| Mystery Game Puzzles | — | 9% |
| LMCA | — | 7.9% |
| ForecastBench | — | 59.1 |
Math GPT-5 Nano leads
Claude 2: 9.3 (#320), GPT-5 Nano: 29.4 (#241)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 81.1% |
| MATH Level 5 | 11.7% | 95.2% |
| FrontierMath (Tiers 1-3) | — | 20% |
| FrontierMath Tier 4 | — | 2.4% |
| ProofBench | — | 12% |
| Omni-MATH | — | 54.6% |
| LMArena Math | — | 1317 |
| FrontierMath (Feb 2025 set) | — | 8.3% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge GPT-5 Nano leads
Claude 2: 16.9 (#287), GPT-5 Nano: 35.9 (#178)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| GPQA Diamond | 34.7% | 69.4% |
| SimpleQA Verified | — | 11.7% |
| MMLU-Pro | — | 77.8% |
| Vectara Hallucination Rate | — | 10.5% |
| GPQA (HELM) | — | 67.9% |
| LMArena Expert | — | 1321 |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |
Multimodal Not comparable
Claude 2: —, GPT-5 Nano: 31.3 (#108)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| LMArena Vision | — | 1159 |
| VPCT | — | 37.2% |
Multilingual Not comparable
Claude 2: —, GPT-5 Nano: 45.3 (#172)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| LMArena Non-English | — | 1313 |
| LMArena Chinese | — | 1356 |
| LMArena German | — | 1327 |
| LMArena Japanese | — | 1226 |
| LMArena Korean | — | 1269 |
| LMArena Russian | — | 1296 |
| LMArena Spanish | — | 1360 |
Instruction Following Not comparable
Claude 2: —, GPT-5 Nano: 75.0 (#79)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| IFEval | — | 93.2% |
| LMArena Instruction Following | — | 1306 |
Long Context Not comparable
Claude 2: —, GPT-5 Nano: 31.3 (#281)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| Fiction.LiveBench | — | 44.4% |
| LMArena Longer Query | — | 1312 |
Writing & Preference Not comparable
Claude 2: —, GPT-5 Nano: 39.1 (#249)
| Benchmark | Claude 2 | GPT-5 Nano |
|---|---|---|
| LMArena Text | — | 1320 |
| LMArena Creative Writing | — | 1249 |
| EQ-Bench Creative Writing | — | 705 |
| WildBench | — | 80.6% |
| LMArena Multi-Turn | — | 1311 |
Frequently asked questions
Is Claude 2 better than GPT-5 Nano?
GPT-5 Nano is the stronger model overall, scoring 33.5 to 25.0 on the Noometry Index.
How many benchmarks do Claude 2 and GPT-5 Nano share?
5 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and GPT-5 Nano has 49.