Model limit probe

OpenAI: GPT-5 Nano | max output limit

OpenAI: GPT-5 Nano max output limit decides whether a key can enter a production route. TestKey reads model ID openai/gpt-5-nano, provider OpenAI, catalog context, real-key headers, 429 errors, and region signals together.

Model

openai/gpt-5-nano

OpenAI: GPT-5 Nano

Provider

OpenAI

62 models in catalog

Limit dimension

max output limit

max-output

Visible signal

partial catalog signal

Context window: 400,000

Limit matrix summary

Model

openai/gpt-5-nano

Limit dimension

max-output

Visible signal

partial catalog signal

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

Why this limit matters

OpenAI: GPT-5 Nano max output limit decides whether a key can enter a production route. TestKey reads model ID openai/gpt-5-nano, provider OpenAI, catalog context, real-key headers, 429 errors, and region signals together.

Model: openai/gpt-5-nano
Provider: OpenAI
Limit dimension: max output limit

How to prove it

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

Start with the visible signal: partial catalog signal, then read headers and error bodies with read-only requests.
max output limit must bind model ID openai/gpt-5-nano; limits from another model at the same provider cannot be reused.
max output limit · partial catalog signal · 400,000

Operator action

OpenAI: GPT-5 Nano 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: partial catalog signal
Context window: 400,000

Open key checker

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