Head-to-head · OpenAI vs Google
ChatGPT vs Gemini 3.1 Pro
Quick answer: ChatGPT stands out for strong general reasoning across domains, and it has a free tier. Gemini 3.1 Pro stands out for strong multimodal coverage. Reviewed September 2026.
Overview
ChatGPT: OpenAI's flagship conversational AI. Used by professionals across every category for drafting, summarization, structured thinking, and as a Swiss-army-knife reasoning assistant.
Gemini 3.1 Pro: Gemini 3.1 Pro, released by Google in February 2026, is a multimodal model with strong agentic capabilities. It is listed at $2 and $12 per million tokens for prompts up to 200,000 tokens ($4 and $18 above that) and is offered in preview on the Gemini API.
At a glance
| Dimension | ChatGPT | Gemini 3.1 Pro |
|---|---|---|
| Vendor | OpenAI | |
| Starting price | $20/mo | API: $2 in / $12 out per M tokens |
| Pricing model | Freemium | Paid |
| Free tier | Yes | No |
| Category | Generative AI | Generative AI |
Strengths and limits
ChatGPT
- Strong general reasoning across domains
- Largest ecosystem of integrations and Custom GPTs
- Frequent model updates
Watch out for
- Hallucinates on niche or recent topics
- Token / message caps frustrate heavy users on Plus
- Model behavior changes between versions can break workflows
Gemini 3.1 Pro
- Strong multimodal coverage
- Deep Google ecosystem integration
- Competitive price for a Pro-tier model
Watch out for
- Listed as a preview model on the pricing page
- Google has said Gemini 4 is coming
- Output style can vary between interfaces
Key features
ChatGPT
- GPT-4-class reasoning on Plus and above
- File upload, web browse, image gen
- Custom GPTs and Projects with shared instructions
- Voice mode (mobile and desktop)
- API access for developers
Gemini 3.1 Pro
- Multimodal understanding across text, images, audio and video
- Agentic and tool-use capabilities
- Tiered pricing for prompts over 200,000 tokens
- Available through the Gemini API and Google Cloud
Pricing compared
ChatGPT has a free tier and paid plans starting at $20/mo. The free tier is enough to test it on real work before you pay.
Gemini 3.1 Pro is priced by usage rather than by seat: API: $2 in / $12 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Frequently asked questions
Which is better, ChatGPT or Gemini 3.1 Pro?
It depends on the work. ChatGPT stands out for strong general reasoning across domains, and it has a free tier. Gemini 3.1 Pro stands out for strong multimodal coverage.
How do ChatGPT and Gemini 3.1 Pro compare on price?
ChatGPT has a free tier and paid plans starting at $20/mo. The free tier is enough to test it on real work before you pay. Gemini 3.1 Pro is priced by usage rather than by seat: API: $2 in / $12 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Is there a free option between ChatGPT and Gemini 3.1 Pro?
ChatGPT offers a free tier or free access, so you can test on real work before paying.