Question 1

What does the GPT-5.4 nano API cost?

Accepted Answer

The official OpenAI list price is $0.200 per 1M input tokens and $1.25 per 1M output tokens. Cached input is $0.020 per 1M tokens, 10× cheaper than the regular input.

Question 2

How much does 1 million tokens of GPT-5.4 nano cost?

Accepted Answer

1M input tokens cost $0.200, 1M output tokens — $1.25. With a 1:1 input/output load a million tokens works out to about $0.725. Chatbots with long context push the blended price down; code generation pushes it up.

Question 3

Where is the GPT-5.4 nano API cheapest?

Accepted Answer

There are no third-party quotes for this model yet. We parse price lists daily and the comparison appears here automatically.

Question 4

What is the GPT-5.4 nano context window?

Accepted Answer

The context window is 400K tokens. Some vendors raise the price above a context threshold — check the plan notes.

Question 5

How do I check that a provider key works?

Accepted Answer

The free checker sends a GET request to your endpoint's model list and reports status and latency. The key is not stored server-side.

GPT-5.4 nano API pricing: the official list and where to look next

What to check before buying