Zephyr Base on AIME 2025: score, rank and what it means
Zephyr Base scores 51.0 on AIME 2025, placing it #452 of 600 models in the index. The benchmark average is 63.6 and the leader is Claude Opus 4.5 Pro at 91.4.
Score distribution
The chart shows the top 10 models on AIME 2025, with Zephyr Base highlighted. Longer bars mean higher scores.
Top 10 leaderboard
| # | Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|---|
| 1 | Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| 2 | GPT-5.2 Pro | OpenAI | 2000000 | $21.32 | 89.6 |
| 3 | GPT-5.1 Pro | OpenAI | 200000 | $19.77 | 87.8 |
| 4 | GPT-5.2 | OpenAI | 2000000 | $19.71 | 88.0 |
| 5 | o4 Reasoning | OpenAI | 1000000 | $19.69 | 87.5 |
| 6 | o4 Pro | OpenAI | 1000000 | $19.37 | 87.3 |
| 7 | Claude Opus 4.5 | Anthropic | 400000 | $19.42 | 87.7 |
| 8 | Gemini 3 Pro Max | Google DeepMind | 2000000 | $20.57 | 87.9 |
| 9 | Claude Opus 4.5 Max | Anthropic | 1000000 | $20.90 | 87.8 |
| 10 | Claude Opus 4.5 Reasoning | Anthropic | 2000000 | $20.91 | 88.2 |
What this score means
On AIME 2025, Zephyr Base sits at #452 of 600. The leader, Claude Opus 4.5 Pro, scores 91.4, so the gap to the top is 40.4 points. The median model in this index scores 67.6, which puts Zephyr Base below the midpoint.
Hugging Face models average 41.0 on this benchmark. Zephyr Base is 10.0 points above that provider line, so it is a stronger result than the average Hugging Face model.
Among open-weight models, the average is 61.8. Zephyr Base is 10.8 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 51.0 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 $1.26 per million input tokens, Zephyr Base is below the median input price of $4.00 across the 600 models scored on AIME 2025. 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 |
|---|---|---|---|---|
| GLM-4.5 7B | Zhipu AI | 8192 | $1.32 | 60.2 |
| Nemotron 4 8B | NVIDIA | 4096 | $1.06 | 57.9 |
| Kimi K2 7B | Moonshot AI | 16384 | $1.72 | 62.7 |
| GPT-NeoX Chat | EleutherAI | 16384 | $1.49 | 60.1 |
| Zephyr Base | Hugging Face | 4096 | $1.26 | 59.5 |
| Firesearch Mini | Fireworks AI | 32768 | $3.94 | 61.5 |
| Pythia Chat | EleutherAI | 4096 | $1.31 | 59.1 |
Other benchmarks for Zephyr Base
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 65.4 | 447 | 26th | |
| GPQA Diamond | 57.2 | 438 | 27th | |
| SWE-bench Verified | 42.4 | 498 | 17th | |
| HumanEval | 64.8 | 443 | 26th | |
| MATH-500 | 62.6 | 440 | 27th | |
| LiveCodeBench | 47.9 | 468 | 22th | |
| IFEval | 70.3 | 456 | 24th | |
| TruthfulQA | 65.1 | 458 | 24th | |
| HellaSwag | 73.1 | 480 | 20th | |
| MMMU | 54.2 | 506 | 16th | |
| Arena Elo | 1270.3 | 458 | 24th |
FAQ
What score does Zephyr Base get on AIME 2025?
Zephyr Base scores 51.0 on AIME 2025 in this index. The benchmark average is 63.6 and the top score is 91.4.
How does Zephyr Base rank on AIME 2025?
It ranks #452 of 600 models, in the 25th percentile. The leader is Claude Opus 4.5 Pro at 91.4.
Is Zephyr Base good at AIME 2025?
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 AIME 2025 score calculated?
AIME 2025 is a mathematics 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 Zephyr Base cost?
Zephyr Base costs $1.26 per million input tokens and $6.45 per million output tokens.