Claude Sonnet 4.5 Reasoning on HellaSwag: score, rank and what it means
Claude Sonnet 4.5 Reasoning scores 95.2 on HellaSwag, placing it #5 of 600 models in the index. The benchmark average is 81.4 and the leader is GPT-5.2 Max at 96.1.
Score distribution
The chart shows the top 10 models on HellaSwag, with Claude Sonnet 4.5 Reasoning highlighted. Longer bars mean higher scores.
Top 10 leaderboard
| # | Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|---|
| 1 | GPT-5.2 Max | OpenAI | 1000000 | $21.39 | 89.2 |
| 2 | GPT-5.2 Turbo | OpenAI | 1000000 | $20.73 | 87.4 |
| 3 | GPT-5.2 Pro | OpenAI | 2000000 | $21.32 | 89.6 |
| 4 | Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| 5 | Claude Sonnet 4.5 Reasoning | Anthropic | 400000 | $19.48 | 87.7 |
| 6 | Grok 4 Reasoning | xAI | 2000000 | $19.67 | 87.8 |
| 7 | GPT-5.2 Vision | OpenAI | 1000000 | $19.03 | 87.4 |
| 8 | Gemini 3 Pro Turbo | Google DeepMind | 400000 | $19.62 | 86.4 |
| 9 | GPT-5.1 Reasoning | OpenAI | 400000 | $20.27 | 88.3 |
| 10 | o4 Pro | OpenAI | 1000000 | $19.37 | 87.3 |
What this score means
On HellaSwag, Claude Sonnet 4.5 Reasoning sits at #5 of 600. The leader, GPT-5.2 Max, scores 96.1, so the gap to the top is 0.9 points. The median model in this index scores 83.6, which puts Claude Sonnet 4.5 Reasoning above the midpoint.
Anthropic models average 89.3 on this benchmark. Claude Sonnet 4.5 Reasoning is 5.9 points above that provider line, so it is a stronger result than the average Anthropic model.
Among frontier models, the average is 92.3. Claude Sonnet 4.5 Reasoning is 2.9 points above that group. This is the more useful comparison if you are shortlisting within the same tier rather than across the whole index.
Read a 95.2 as a relative signal, not an absolute guarantee. Benchmark scores depend on prompt format, evaluation harness and contamination controls. Use this page to narrow the shortlist, then test the model on your own data.
Price context
At $19.48 per million input tokens, Claude Sonnet 4.5 Reasoning is above the median input price of $4.00 across the 600 models scored on HellaSwag. The models immediately around it in the ranking are shown below so you can compare score and price together.
| Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|
| GPT-5.2 Max | OpenAI | 1000000 | $21.39 | 89.2 |
| GPT-5.2 Turbo | OpenAI | 1000000 | $20.73 | 87.4 |
| GPT-5.2 Pro | OpenAI | 2000000 | $21.32 | 89.6 |
| Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| Claude Sonnet 4.5 Reasoning | Anthropic | 400000 | $19.48 | 87.7 |
| Grok 4 Reasoning | xAI | 2000000 | $19.67 | 87.8 |
| GPT-5.2 Vision | OpenAI | 1000000 | $19.03 | 87.4 |
Other benchmarks for Claude Sonnet 4.5 Reasoning
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 87.6 | 24 | 96th | |
| GPQA Diamond | 85.2 | 5 | 99th | |
| SWE-bench Verified | 79.6 | 8 | 99th | |
| HumanEval | 90.3 | 40 | 93th | |
| MATH-500 | 89.7 | 51 | 92th | |
| AIME 2025 | 87.3 | 17 | 97th | |
| LiveCodeBench | 85.1 | 1 | 100th | |
| IFEval | 91.9 | 41 | 93th | |
| TruthfulQA | 87.6 | 26 | 96th | |
| MMMU | 85.2 | 4 | 99th | |
| Arena Elo | 1486.5 | 12 | 98th |
FAQ
What score does Claude Sonnet 4.5 Reasoning get on HellaSwag?
Claude Sonnet 4.5 Reasoning scores 95.2 on HellaSwag in this index. The benchmark average is 81.4 and the top score is 96.1.
How does Claude Sonnet 4.5 Reasoning rank on HellaSwag?
It ranks #5 of 600 models, in the 99th percentile. The leader is GPT-5.2 Max at 96.1.
Is Claude Sonnet 4.5 Reasoning good at HellaSwag?
Yes, relative to the index: it is above the median and inside the top half of scores. The result should be read alongside its price and context window.
How is the HellaSwag score calculated?
HellaSwag is a commonsense benchmark. Scores in this index are modelled estimates on a 0–100 scale (or Elo for Arena), derived from capability tier and benchmark difficulty. They are not official leaderboard results.
What does Claude Sonnet 4.5 Reasoning cost?
Claude Sonnet 4.5 Reasoning costs $19.48 per million input tokens and $68.20 per million output tokens.