Side by side
Gemini API and Google AI Studio vs OpenAI API
A fact-based comparison built only from each tool's verified directory profile — pricing summaries, plan availability, platforms, and stated strengths and limitations. No rankings, no sponsored placement.
| Criterion | Gemini API and Google AI Studio | OpenAI API |
|---|---|---|
| Category | LLM APIs & Model Platforms | LLM APIs & Model Platforms |
| In one sentence | Google's developer API for Gemini models, with a free tier in Google AI Studio and paid tiers for production. | Pay-per-token developer access to OpenAI's GPT models for building apps, agents and automations. |
| Problem it solves | Getting started with a capable multimodal model cheaply, and scaling to production on the same API. | Adding language understanding, generation and reasoning to a product without training or hosting a model yourself. |
| Free plan | Yes | No |
| Developer API | Yes — docs | Yes — docs |
| Open source | No | No |
| Platforms | Web (Google AI Studio), REST API | Web (platform dashboard), REST API |
| Pricing (summary) | Free tier for many Flash and Flash-Lite models with lower rate limits. Paid usage is per 1M tokens: Gemini 4 Argon $2 input / $10 output through Nov 30, 2026 (then $4 / $20); Gemini 3.8 Flash $0.75 / $3.75 through Dec 31, 2026 (then $1.50 / $7.50); Gemini 3.5 Flash-Lite $0.30 / $2.50. Batch is about half price. Checked 2026-10-19 | Usage-based billing per 1M tokens, with separate rates for input, cached input and output. GPT-6 Astra costs $10 input / $50 output, GPT-6.1 Sol $2 / $10 and GPT-6 Luna $0.10 / $0.50 per 1M tokens on the Standard tier. Batch and Flex are about half price; Fast mode costs more. Checked 2026-10-19 |
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How to choose
Both profiles link to the vendors' official pricing — plan details change often, so verify there before buying. Pick based on the criterion rows above that matter to your workflow, not on rankings: we don't rank tools, because the right choice depends on your needs.