Seed-OSS 1.5B on HellaSwag: score, rank and what it means
Seed-OSS 1.5B scores 66.8 on HellaSwag, placing it #565 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 Seed-OSS 1.5B 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, Seed-OSS 1.5B sits at #565 of 600. The leader, GPT-5.2 Max, scores 96.1, so the gap to the top is 29.3 points. The median model in this index scores 83.6, which puts Seed-OSS 1.5B below the midpoint.
ByteDance models average 82.5 on this benchmark. Seed-OSS 1.5B is 15.7 points below that provider line, so it is a weaker result than the average ByteDance model.
Among small open-weight models, the average is 70.2. Seed-OSS 1.5B is 3.4 points below that group. This is the more useful comparison if you are shortlisting within the same tier rather than across the whole index.
Read a 66.8 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 $0.45 per million input tokens, Seed-OSS 1.5B is below 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 |
|---|---|---|---|---|
| Command R+ 1.5B | Cohere | 32768 | $0.51 | 50.0 |
| Llama 3 Anyscale 1.5B | Anyscale | 16384 | $0.43 | 48.9 |
| Mixtral Turbo 1.5B | Together AI | 4096 | $0.31 | 47.6 |
| OLMo 2 7B | Allen Institute for AI | 16384 | $0.56 | 51.7 |
| Seed-OSS 1.5B | ByteDance | 4096 | $0.45 | 49.8 |
| Hunyuan-Large 1.5B | Tencent | 8192 | $0.54 | 50.5 |
| Llama 3 Novita 1.5B | Novita AI | 4096 | $0.41 | 49.1 |
Other benchmarks for Seed-OSS 1.5B
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 57.5 | 556 | 7th | |
| GPQA Diamond | 45.3 | 566 | 6th | |
| SWE-bench Verified | 35.5 | 553 | 8th | |
| HumanEval | 53.5 | 551 | 8th | |
| MATH-500 | 50.2 | 555 | 8th | |
| AIME 2025 | 36.4 | 559 | 7th | |
| LiveCodeBench | 33.5 | 575 | 4th | |
| IFEval | 60.9 | 566 | 6th | |
| TruthfulQA | 58.2 | 546 | 9th | |
| MMMU | 50.5 | 548 | 9th | |
| Arena Elo | 1201.5 | 551 | 8th |
FAQ
What score does Seed-OSS 1.5B get on HellaSwag?
Seed-OSS 1.5B scores 66.8 on HellaSwag in this index. The benchmark average is 81.4 and the top score is 96.1.
How does Seed-OSS 1.5B rank on HellaSwag?
It ranks #565 of 600 models, in the 6th percentile. The leader is GPT-5.2 Max at 96.1.
Is Seed-OSS 1.5B good at HellaSwag?
It is below the median for this benchmark, so test it carefully before relying on it for this capability. 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 Seed-OSS 1.5B cost?
Seed-OSS 1.5B costs $0.45 per million input tokens and $2.36 per million output tokens.