One family. Every available model.

Cheap Claude API: Models & Pricing

Compare Opus, Sonnet and Haiku for coding, reasoning and everyday tasks. Choose a Claude API model by input, output and cached-token cost, then connect it with one OmniaKey key.

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Claude API prices

OmniaKey price

Claude Opus 5.5

claude-opus-5-5

Context: 1M

USD / 1M tokens

Input: $1.12
Output: $5.6
Cached input: $0.056

Claude Sonnet 5.5

claude-sonnet-5-5

Context: 1M

USD / 1M tokens

Input: $0.56
Output: $2.8
Cached input: $0.056

Claude Haiku 5.5

claude-haiku-5-5

Context: 1M

USD / 1M tokens · <=100K

Input: $0.08
Output: $0.4
Cached input: $0.008

USD / 1M tokens · >100K

Input: $0.4
Output: $2
Cached input: $0.04

Claude Opus 5

claude-opus-5

Context: 1M

USD / 1M tokens

Input: $1.4
Output: $7
Cached input: $0.14

Claude Fable 5

claude-fable-5

Context: 1M

USD / 1M tokens

Input: $2.8
Output: $14
Cached input: $0.28

Claude Fable 5.1

claude-fable-5-1

Context: 1M

USD / 1M tokens

Input: $2.8
Output: $14
Cached input: $0.07

Claude Opus 4.8

claude-opus-4-8

Context: 1M

USD / 1M tokens

Input: $1.4
Output: $7
Cached input: $0.14

Claude Opus 4.7

claude-opus-4-7

Context: 1M

USD / 1M tokens

Input: $1.4
Output: $7
Cached input: $0.14

Claude Opus 4.6

claude-opus-4-6

Context: 1M

USD / 1M tokens

Input: $1.4
Output: $7
Cached input: $0.14

Claude Sonnet 5

claude-sonnet-5

Context: 1M

USD / 1M tokens

Input: $0.56
Output: $2.8
Cached input: $0.056

Claude Sonnet 4.6

claude-sonnet-4-6

Context: 1M

USD / 1M tokens

Input: $0.84
Output: $4.2
Cached input: $0.084

Claude Haiku 4.5

claude-haiku-4-5

Context: 200K

USD / 1M tokens

Input: $0.28
Output: $1.4
Cached input: $0.028

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 Claude 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 Claude 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 Anthropic 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.