Model limit probe

Microsoft: Phi 4 | concurrency limit

Microsoft: Phi 4 concurrency limit decides whether a key can enter a production route. TestKey reads model ID microsoft/phi-4, provider Microsoft, catalog context, real-key headers, 429 errors, and region signals together.

Model

microsoft/phi-4

Microsoft: Phi 4

Provider

Microsoft

2 models in catalog

Limit dimension

concurrency limit

concurrency

Visible signal

real key probe required

Context window: 16,384

Limit matrix summary

Model

microsoft/phi-4

Limit dimension

concurrency

Visible signal

real key probe required

Read-only check. Detection data burns after 5 minutes.

Why this limit matters

Microsoft: Phi 4 concurrency limit decides whether a key can enter a production route. TestKey reads model ID microsoft/phi-4, provider Microsoft, catalog context, real-key headers, 429 errors, and region signals together.

Model: microsoft/phi-4
Provider: Microsoft
Limit dimension: concurrency limit

How to prove it

Read-only check. Detection data burns after 5 minutes.

Start with the visible signal: real key probe required, then read headers and error bodies with read-only requests.
concurrency limit must bind model ID microsoft/phi-4; limits from another model at the same provider cannot be reused.
concurrency limit · real key probe required · 16,384

Operator action

Microsoft: Phi 4 concurrency limit is not just a number. It should become route throttling, sale tags, headroom alerts, fallback model suggestions, and price protection.

Read-only check. Detection data burns after 5 minutes.
Visible signal: real key probe required
Context window: 16,384

Open key checker

Read-only check. Detection data burns after 5 minutes.