Model limit probe

Anthropic: Claude Sonnet 4 | max output limit

Anthropic: Claude Sonnet 4 max output limit decides whether a key can enter a production route. TestKey reads model ID anthropic/claude-sonnet-4, provider Anthropic, catalog context, real-key headers, 429 errors, and region signals together.

Model

anthropic/claude-sonnet-4

Anthropic: Claude Sonnet 4

Provider

Anthropic

13 models in catalog

Limit dimension

max output limit

max-output

Visible signal

catalog visible

Context window: 1,000,000

Limit matrix summary

Model

anthropic/claude-sonnet-4

Limit dimension

max-output

Visible signal

catalog visible

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

Why this limit matters

Anthropic: Claude Sonnet 4 max output limit decides whether a key can enter a production route. TestKey reads model ID anthropic/claude-sonnet-4, provider Anthropic, catalog context, real-key headers, 429 errors, and region signals together.

Model: anthropic/claude-sonnet-4
Provider: Anthropic
Limit dimension: max output limit

How to prove it

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

Start with the visible signal: catalog visible, then read headers and error bodies with read-only requests.
max output limit must bind model ID anthropic/claude-sonnet-4; limits from another model at the same provider cannot be reused.
max output limit · catalog visible · 1,000,000

Operator action

Anthropic: Claude Sonnet 4 max output 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: catalog visible
Context window: 1,000,000

Open key checker

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

Open models

Anthropic: Claude Sonnet 4

Open providers

Anthropic