Microsoft · Reasoning
Phi-4-reasoning-plus
RL-tuned sibling of Phi-4-reasoning at identical token prices — higher accuracy but noticeably longer chains of thought, so it costs more per answer in practice. Still priced and listed in the Foundry catalog, but dropped from the current 'Microsoft models' doc table, so treat its hosted lifetime as shorter than Phi-4-reasoning's.
Open weights · Permissive (Apache, MIT, OpenMDW) · Data checked September 6, 2026 · Not a hands-on evaluation
Model ID Phi-4-reasoning-plus
- Parameters
- 14.7B
- Architecture
- Not recorded
- Context window
- 32,768 tokensMaximum input
- Max output
- 32,768 tokensPer response
- Input price
- $0.125 per 1M tokens
- Output price
- $0.50 per 1M tokens
- Cached input
- Not published
- Blended price
- $0.2188 per 1M tokens3:1 input to output
- Knowledge cutoff
- 2025-03
- Released
- 2025-04-30
- Status
- ga
- Size band
- 4B to 15B
License and openness
Phi-4-reasoning-plus is released under the MIT. This is a permissive license. It generally allows use, modification and redistribution, including commercial use, subject to attribution and notice requirements. License terms can change between versions; confirm the text published with the weights you download.
Capabilities
| Input modalities | text |
|---|---|
| Output modalities | text |
What it is for
Still priced and listed in the Foundry catalog, but dropped from the current 'Microsoft models' doc table, so treat its hosted lifetime as shorter than Phi-4-reasoning's.
At a three-to-one input-to-output ratio, Phi-4-reasoning-plus costs $0.22 per million tokens blended. A workload of one million input and 330,000 output tokens per day would run about $8.70 per month at list price, before caching or batch discounts.
Cost at list price
| Input | $0.125 per 1M tokens |
|---|---|
| Output | $0.50 per 1M tokens |
| Cached input | Not published |
| Blended, 3:1 | $0.2188 per 1M tokens |
Sources
- Source: prices.azure.com ↗
- Microsoft pricing ↗
- API docs ↗
- Full reference record for Phi-4-reasoning-plus ↗
- Microsoft in the reference ↗
Sources checked September 6, 2026. Specifications and prices change without notice; confirm against the provider before you commit.
Other open-weight models from Microsoft
- MAI-DS-R1 · 671B total · 37B active
- Phi-4 · 14.7B
- Phi-4-mini-instruct · 3.8B
- Phi-4-multimodal-instruct · 5.6B
- Phi-4-reasoning · 14.7B
- Phi-4-mini-reasoning · 3.8B
- Phi-4-mini-flash-reasoning · 3.8B
- Phi-4-Reasoning-Vision-15B · 15B
- Phi-mini-MoE-instruct · 7.6B total · 2.4B active
- Phi-tiny-MoE-instruct · 3.8B total · 1.1B active
- Phi-Ground-Any · Not recorded
- Phi-3.5-mini-instruct · 3.8B