PhiBench
Phi-4-Reasoning-plus 74.2% leads since April 2025 Models answer original prompts that Microsoft's Phi team wrote to test a wide range of skills and reasoning.
In-house: Microsoft never released the tasks, and the Phi-4-reasoning report uses a newer version, PhiBench 2.21.
- Made by
- Microsoft
- Released
- December 2024
- Kind
- Other
- Level
- University
- Scored
- Graded by a model
- Answers
- Open-ended
- Tasks
- Kept private
- Strongest model tested
- Phi-4 #159 on the capability index
- Last in a launch post
- April 2025, dropped before it saturated
- Last model added
- April 2025
Phi-4-Reasoning-plus leads with 74.2% among models released by April 2025
Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.
The newest model with a score here came out in April 2025, and nobody has reported a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:
- Claude Fable 5.2
-
Gemini 4 Carbon - GPT-6 Astra
- Claude Opus 5.5
- and 16 more
- 1 Phi-4-Reasoning-plus 74.2%
- 2 Phi-4-reasoning 70.6%
- 3 Phi-4 56.2%
Source: Labs’ model cards
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Phi-4-Reasoning-plus | 74.2% | Apr 2025 | Lab model card | |
| 2 | Phi-4-reasoning | 70.6% | Apr 2025 | Lab model card | |
| 3 | Phi-4 | 56.2% | Dec 2024 | Lab model card |
2 models have held number one in labs’ own numbers since its release in December 2024
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Labs’ model cards
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Source: Labs’ model cards
No launch post has listed it since April 2025
Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.
| Date | Launch post | Score | As the post writes it |
|---|---|---|---|
| Apr 30, 2025 | Phi-4-reasoning | 70.6 | PhiBench 2.21 |
| Apr 30, 2025 | Phi-4-Reasoning-plus | 74.2 | PhiBench 2.21 |
| Dec 12, 2024 | Phi-4 | 56.2 | PhiBench (internal) |
3 system cards report it, from 1 lab
Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| Apr 30, 2025 | Phi-4-reasoning technical report | 70.6 | PhiBench 2.21 (Table 2) | Capabilities |
| Apr 30, 2025 | Phi-4-Reasoning-plus technical report | 74.2 | PhiBench 2.21 (Table 2) | Capabilities |
| Dec 12, 2024 | Phi-4 technical report | 56.2 | PhiBench (internal) (Table 1) | Capabilities |
More in Other
- Personal Superintelligence Index (Meta) In use Meta's composite of seven personal and knowledge-work evals: Agents' Last Exam, AutomationBench-AA, FocusBench, JobBench, GDP.pdf, VBT and DRACO.
- Artificial Analysis Intelligence Index v5 In use Version 5 of Artificial Analysis's index: nine evaluations in four equal categories, most with private test sets, run three times each in its own agent harness. Gemini 4 Carbon 59.0
- SAGE v1.1 (Vals) In use Models grade handwritten undergraduate math and computer science work against rubrics. Scored by class-balanced accuracy of each rubric check against expert grading. Claude Opus 5.5 91.3%
- MTEB Fading Massive Text Embedding Benchmark: retrieval, clustering, classification across languages and modalities.
sonar 42% - Anthropic ECI (AECI) Only in system cards Index that combines a basket of capability benchmarks into one capability score to track trends across Anthropic models. Claude Opus 5.5 169.4
- SPEED-Bench Only in system cards Measures speculative decoding across varied prompts and domains. Reports the average acceptance length of draft tokens, so higher means faster generation at the same output.
Nemotron 3 Ultra 5.15