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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: Jul 8, 2026
All Models Compared
Every Gemini and ChatGPT model, ranked by input price.
| Model | Provider | Tier | Input (per 1M) | Output (per 1M) | Context |
|---|---|---|---|---|---|
| Gemini 2.5 Flash-Lite | Budget | $0.075 | $0.30 | 1M | |
| Gemini 2.5 Flash-Lite | 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. GPT-oss 20B at $0.08/$0.35 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?
GPT-oss 20B at $0.08/$0.35 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 2.5 Flash-Lite 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.
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