LLMs & APIs comparison 
OpenAI API vs Google Gemini API
Our pick: OpenAI API scores 9.5/10 against 9.2/10 for Google Gemini API. Here's how they differ and which one fits your needs.
OpenAI API
API access to GPT models, reasoning, images, voice and agents
9.5/10PaidOur pick
Visit OpenAI API VS
Google Gemini API
Gemini models via Google AI Studio and Vertex AI
9.2/10Free plan
Visit Google Gemini API At a glance
| OpenAI API | Google Gemini API | |
|---|---|---|
| Our score | 9.5/10 | 9.2/10 |
| Best for | Developers, Startups, Enterprises | Developers, Startups |
| Type | Model providers | Model providers |
| Pricing | Paid | Free plan |
| Starting price | See website | Free |
| Platforms | API | API, Web |
| Launched | 2020 | 2023 |
Key features
OpenAI API
- GPT and reasoning models
- Responses API
- Realtime voice
- Image generation
- Agents SDK
Google Gemini API
- Long context
- Multimodal input
- Search grounding
- Live API
- AI Studio playground
OpenAI API: pros and cons
Pros
- Broadest ecosystem and documentation
- Strong multimodal capabilities
Cons
- Usage costs can grow quickly
- Model deprecations require upkeep
Google Gemini API: pros and cons
Pros
- Generous free tier
- Excellent price-performance
- Huge context window
Cons
- Two overlapping platforms (AI Studio vs Vertex)
- Rapid model churn
Verdict: OpenAI API or Google Gemini API?
Choose OpenAI API if you're developers or startups or enterprises and value broadest ecosystem and documentation.
Choose Google Gemini API if you're developers or startups and value generous free tier.
Overall we rate OpenAI API slightly higher. Both are worth trying, and at least one has a free plan or trial. See all LLMs & APIs tools for more options.
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