One family. Every available model.

Cheap GPT API: Models & Pricing

Compare GPT models for coding and reasoning. See input, output and cache prices together, check the supported API for your chosen model, and connect your application.

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GPT API prices

OmniaKey price

GPT-6.1 Sol

gpt-6.1-sol

Context: 1M

USD / 1M tokens · <=272K

Input: $0.225
Output: $1.35
Cached input: $0.0225

USD / 1M tokens · >272K

Input: $0.225
Output: $1.35
Cached input: $0.0225

GPT-6.1 Terra

gpt-6.1-terra

Context: 1M

USD / 1M tokens · <=272K

Input: $0.1125
Output: $0.675
Cached input: $0.01125

USD / 1M tokens · >272K

Input: $0.1125
Output: $0.675
Cached input: $0.01125

GPT-6 Sol

gpt-6-sol

Context: 1M

USD / 1M tokens · <=272K

Input: $0.225
Output: $1.35
Cached input: $0.045

USD / 1M tokens · >272K

Input: $0.225
Output: $1.35
Cached input: $0.045

GPT-6 Luna

gpt-6-luna

Context: 1M

USD / 1M tokens · <=272K

Input: $0.2
Output: $1.2
Cached input: $0.02

USD / 1M tokens · >272K

Input: $0.2
Output: $1.2
Cached input: $0.02

GPT-6 Astra

gpt-6-astra

Context: 1M

USD / 1M tokens · <=272K

Input: $0.9
Output: $4.5
Cached input: $0.09

USD / 1M tokens · >272K

Input: $0.9
Output: $4.5
Cached input: $0.09

GPT-5.6 Sol

gpt-5.6-sol

Context: 1M

USD / 1M tokens

Input: $0.45
Output: $2.7
Cached input: $0.045

GPT-5.6 Terra

gpt-5.6-terra

Context: 1M

USD / 1M tokens

Input: $0.3
Output: $1.8
Cached input: $0.03

GPT-5.6 Luna

gpt-5.6-luna

Context: 1M

USD / 1M tokens

Input: $0.2
Output: $1.2
Cached input: $0.02

GPT-5.5

gpt-5.5

Context: 1M

USD / 1M tokens

Input: $0.45
Output: $2.7
Cached input: $0.045

These are OmniaKey catalog prices in USD. Availability and permitted models depend on your API key. Review the model details and tool fees before sending a paid request.

How GPT API prices are calculated

Input, output and cached input are separate meters. Check every context tier for your expected prompt length. Tool surcharges, where applicable, are listed separately.

Tool fees

From model selection to your first request

Choose a model

Open a model to check its capabilities, supported parameters and exact API ID.

Configure your key

Pair your OmniaKey key with the OmniaKey API URL. The setup guide includes a connection check.

Connect your application

Use the protocol documented for your model. Image and video requests run as asynchronous tasks.

Read the API documentation

Questions before you connect

How do I choose a cheap GPT API?

Compare the total cost of your workload across models in this family. Account for output, cache, resolution and duration where relevant. The lowest starting price does not always give the lowest cost for an acceptable result.

Is an OmniaKey key an official OpenAI key?

No. OmniaKey issues its own key for the OmniaKey endpoint and account balance. A key issued by the model provider uses that provider’s endpoint and billing. The setup guide links to both routes.