Zephyr on IFEval: score, rank and what it means
Zephyr scores 70.4 on IFEval, placing it #455 of 600 models in the index. The benchmark average is 78.6 and the leader is Claude Opus 4.5 Pro at 96.1.
Score distribution
The chart shows the top 10 models on IFEval, with Zephyr 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 | Claude Opus 4.5 Reasoning | Anthropic | 2000000 | $20.91 | 88.2 |
| 3 | GPT-5.2 Pro | OpenAI | 2000000 | $21.32 | 89.6 |
| 4 | GPT-5.2 Max | OpenAI | 1000000 | $21.39 | 89.2 |
| 5 | GPT-5.2 Reasoning | OpenAI | 1000000 | $20.98 | 87.5 |
| 6 | GPT-5.1 Pro | OpenAI | 200000 | $19.77 | 87.8 |
| 7 | Gemini 3 Pro Max | Google DeepMind | 2000000 | $20.57 | 87.9 |
| 8 | GPT-5.1 Reasoning | OpenAI | 400000 | $20.27 | 88.3 |
| 9 | Claude Opus 4.5 Max | Anthropic | 1000000 | $20.90 | 87.8 |
| 10 | o4 Reasoning | OpenAI | 1000000 | $19.69 | 87.5 |
What this score means
On IFEval, Zephyr sits at #455 of 600. The leader, Claude Opus 4.5 Pro, scores 96.1, so the gap to the top is 25.7 points. The median model in this index scores 81.2, which puts Zephyr below the midpoint.
Hugging Face models average 64.6 on this benchmark. Zephyr is 5.8 points above that provider line, so it is a stronger result than the average Hugging Face model.
Among open-weight models, the average is 77.0. Zephyr is 6.6 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 70.4 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 $1.61 per million input tokens, Zephyr is below the median input price of $4.00 across the 600 models scored on IFEval. 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 |
|---|---|---|---|---|
| Codestral 8B | Mistral AI | 4096 | $1.18 | 59.0 |
| GPT-NeoX Chat | EleutherAI | 16384 | $1.49 | 60.1 |
| Llama 3.3 Groq 8B | Groq | 16384 | $1.17 | 59.5 |
| Pythia | EleutherAI | 32768 | $1.29 | 59.8 |
| Zephyr | Hugging Face | 8192 | $1.61 | 62.8 |
| Zephyr Base | Hugging Face | 4096 | $1.26 | 59.5 |
| Llama 3.3 8B | Meta AI | 8192 | $1.26 | 60.1 |
Other benchmarks for Zephyr
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 68.8 | 408 | 32th | |
| GPQA Diamond | 60.5 | 400 | 33th | |
| SWE-bench Verified | 50.3 | 419 | 30th | |
| HumanEval | 65.9 | 432 | 28th | |
| MATH-500 | 65.3 | 418 | 30th | |
| AIME 2025 | 55.1 | 415 | 31th | |
| LiveCodeBench | 48.7 | 460 | 23th | |
| TruthfulQA | 67.8 | 417 | 31th | |
| HellaSwag | 76.3 | 423 | 30th | |
| MMMU | 62.2 | 408 | 32th | |
| Arena Elo | 1303.0 | 414 | 31th |
FAQ
What score does Zephyr get on IFEval?
Zephyr scores 70.4 on IFEval in this index. The benchmark average is 78.6 and the top score is 96.1.
How does Zephyr rank on IFEval?
It ranks #455 of 600 models, in the 24th percentile. The leader is Claude Opus 4.5 Pro at 96.1.
Is Zephyr good at IFEval?
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 IFEval score calculated?
IFEval is a instruction following 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 cost?
Zephyr costs $1.61 per million input tokens and $6.84 per million output tokens.