Gemini vs ChatGPT — API Pricing Comparison
Compare Google Gemini and OpenAI ChatGPT models side by side. Interactive calculator shows exact costs for your usage pattern.
Pricing data verified: May 14, 2026
All Models Compared
Every Gemini and ChatGPT model, ranked by input price.
| Model | Provider | Tier | Input (per 1M) | Output (per 1M) | Context |
|---|---|---|---|---|---|
| Gemini 2.0 Flash Lite | Budget | $0.075 | $0.30 | 1M | |
| Gemini 2.0 Flash | Budget | $0.10 | $0.40 | 1M | |
| GPT-4o mini | OpenAI | Budget | $0.15 | $0.60 | 128K |
| GPT-5 mini | OpenAI | Budget | $0.25 | $2.00 | 272K |
| Gemini 2.5 Pro | Mid | $1.25 | $10.00 | 1M | |
| GPT-5 | OpenAI | Premium | $1.25 | $10.00 | 272K |
| Gemini 3.1 Pro | Mid | $2.00 | $12.00 | 1M | |
| GPT-4o | OpenAI | Mid | $2.50 | $10.00 | 128K |
| GPT-5.5 | OpenAI | Premium | $5.00 | $30.00 | 1M |
Calculate Your Exact Costs
Pick your Gemini and ChatGPT models, enter your usage, see the comparison.
Which Should You Choose?
High-Volume Chatbot
Millions of messages, short responses. Cost per message is critical.
Code Generation
Complex reasoning, longer outputs. Quality and accuracy matter.
Long Document Analysis
Processing 500K+ token documents. Context window is the bottleneck.
Data Classification
Simple categorization at massive scale. Budget is tight.
RAG Pipeline
Retrieval-augmented generation with long context windows.
Multi-Model Pipeline
Route tasks to the best model for each job.
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Frequently Asked Questions
Is Gemini or ChatGPT cheaper for API usage?
Google Gemini is significantly cheaper at the budget tier. Gemini 2.0 Flash Lite ($0.075/$0.30 per 1M tokens) is the cheapest model in the entire market — half the price of GPT-4o mini ($0.15/$0.60). At the mid tier, Gemini 2.5 Pro ($1.25/$10) matches GPT-5 ($1.25/$10) exactly. Gemini's key advantage is 1M context windows even on budget models.
What is the cheapest Gemini model vs the cheapest ChatGPT model?
Gemini 2.0 Flash Lite at $0.075/$0.30 per 1M tokens is the cheapest model available from any major provider. GPT-4o mini costs $0.15/$0.60 — exactly 2x more on both input and output. For high-volume workloads, Gemini Flash Lite offers the best value in the market.
Which has a bigger context window: Gemini or ChatGPT?
Gemini wins on context windows across all tiers. Gemini 2.0 Flash and Flash Lite both support 1M tokens. Gemini 2.5 Pro also supports 1M. ChatGPT's largest is GPT-5 at 272K and GPT-5.5 at 1M. For budget models, Gemini offers 8x the context of GPT-4o mini (128K) at a lower price.
Gemini 2.5 Pro vs GPT-5: which should I choose?
Both cost $1.25/$10 per 1M tokens — identical pricing. The difference is context window: Gemini 2.5 Pro offers 1M tokens vs GPT-5's 272K. For long-context tasks, Gemini is the clear winner. For tasks under 272K, choose based on quality benchmarks for your specific use case.
Can I use both Gemini and ChatGPT in the same application?
Yes. A common strategy: use Gemini Flash Lite ($0.075/M) for high-volume simple tasks, GPT-5 or Gemini 2.5 Pro ($1.25/M) for complex reasoning, and Claude Sonnet 4.6 ($3/M) for long-context analysis. This multi-model approach typically costs under $1/M tokens average — 60% less than using a single premium model.