Question 1

What does the GPT-4.1 API cost?

Accepted Answer

The official OpenAI list price is $2.00 per 1M input tokens and $8.00 per 1M output tokens. Cached input is $0.500 per 1M tokens, 4× cheaper than the regular input.

Question 2

How much does 1 million tokens of GPT-4.1 cost?

Accepted Answer

1M input tokens cost $2.00, 1M output tokens — $8.00. With a 1:1 input/output load a million tokens works out to about $5.00. Chatbots with long context push the blended price down; code generation pushes it up.

Question 3

Where is the GPT-4.1 API cheapest?

Accepted Answer

Our measurements show RunAPI as the cheapest: 94% below the official price. Quotes from 3 providers refresh daily — see the table above.

Question 4

What is the GPT-4.1 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.

#	Provider	1M input	1M output	Discount	Tokens per $100
—	Official list	$2.00	$8.00	0%	33.3M
1	RunAPI	$0.120	$0.480	−94%	556M
2	Crazyrouter	$0.300	$1.20	−85%	222M
3	Polza.ai	$2.94	$11.75	—	22.7M

Cheapest GPT-4.1 API: RunAPI is 94% below the official price

What to check before buying