Anthropic Claude API versus OpenAI API

Price

• Anthropic Claude API Usage-based API pricing
• OpenAI API Usage-based API pricing

A complete like-for-like price comparison is not established; the next checks say what is missing.

Documented for both

API interfaces

Anthropic Claude API Messages API, Message Batches API, Token Counting API, Models API

OpenAI API Responses API and client SDKs

Model catalogue

Anthropic Claude API Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, Claude Haiku 5.5

OpenAI API GPT-6 Astra, GPT-6.1 Sol, GPT-6 Luna

Billing basis

Anthropic Claude API Model-dependent input and output token charges, with separate cache and batch pricing.

OpenAI API Model-dependent input and output token rates; tools can carry additional charges.

Availability

Anthropic Claude API Console credentials or configured Workload Identity Federation are prerequisites.

OpenAI API Request and token rate limits depend on the account usage tier.

Limits to check

• Anthropic Claude API Direct API access requires a Console account and credentials; cloud-platform access has its own configuration.
• OpenAI API Capabilities, rates and tool support vary by model. A model catalogue entry does not establish access through a consumer subscription.

Not verified yet

No reviewed evidence for either product on data controls.

Not verified means our reviewed sources do not establish it. It does not mean a product lacks the capability or that it costs nothing.

Next steps

• Choose the exact Anthropic Claude API model first: its token rates depend on the model and service tier.
• Choose the exact OpenAI API model first: its token rates depend on the model and service tier.
• Ask Anthropic Claude API about data controls; our sources do not establish it yet.
• Ask OpenAI API about data controls; our sources do not establish it yet.

• Anthropic Claude API profile and plans · Visit Anthropic Claude API
• OpenAI API profile and plans · Visit OpenAI API