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Phi-3.5

Microsoft · Phi line · lightweight · open weights

Released August 20, 2024Replaced by Phi-4

Phi-3.5 was released by Microsoft on August 20, 2024, as an open-weights lightweight model in the Phi line.

  • Release 4 of 9 in the Phi line.
  • Came 91 days after Phi-3-vision, released May 21, 2024.
  • Replaced by Phi-4 on December 12, 2024, 114 days later.
  • These days the line ships a new model about every 76 days.

No detailed card for this model: we only add numbers published by the maker or by independent benchmarks.

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Where the Phi line stands

Phi-4-reasoning-vision is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

Phi

Microsoft · lightweight line · open weights

Latest: Phi-4-reasoning-vision · Mar 4, 2026

Longer than usual234 days since the last release · usual gap 76 days

A 15B open-weight Phi model built on Phi-4-reasoning that reads images and mixes quick answers with step-by-step reasoning, aimed at visual math and science and at finding elements on computer and phone screens.

What changed in Phi-4-reasoning-vision →
Days since last release
234
days
Usual gap
76
days
Recent gaps
Phi-4-reasoning-vision · Mar 2026
238
Phi-4-mini-flash-reasoning · Jul 2025
70
Phi-4-reasoning · Apr 2025
63
Phi-4-mini · Feb 2025
76

Every Phi release

Newest first. See the full line with every card →

  1. Mar 4, 2026Phi-4-reasoning-vision
  2. Jul 9, 2025Phi-4-mini-flash-reasoning
  3. Apr 30, 2025Phi-4-reasoning
  4. Feb 26, 2025Phi-4-mini
  5. Dec 12, 2024Phi-4
  6. Aug 20, 2024Phi-3.5 · this page
  7. May 21, 2024Phi-3-vision
  8. Apr 23, 2024Phi-3
  9. Dec 12, 2023Phi-2