Google Gemini API versus OpenAI API

Price

• Google Gemini 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

Google Gemini API Gemini API

OpenAI API Responses API and client SDKs

Model catalogue

Google Gemini API Gemini 3.8 Flash, Gemini 3.5 Flash-Lite

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

Billing basis

Google Gemini API Model-specific free and paid tiers, with standard, batch and other service rates.

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

Availability

Google Gemini API Gemini 2.5 access is limited to prior users; current model status must be checked individually.

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

Limits to check

• Google Gemini API Model availability differs by family. The documentation restricts Gemini 2.5 access to prior users and directs new projects to newer models.
• 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 Google Gemini 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 Google Gemini API about data controls; our sources do not establish it yet.
• Ask OpenAI API about data controls; our sources do not establish it yet.

• Google Gemini API profile and plans · Visit Google Gemini API
• OpenAI API profile and plans · Visit OpenAI API