OpenAI now offers 10 GPT models at wildly different price points. Choosing the wrong one can cost you 50x more than necessary. Here's the complete ranking from cheapest to most expensive.
GPT Models Ranked by Price (Cheapest First)
| # | Model | Input | Output | Best For |
|---|---|---|---|---|
| 1 | GPT-oss 20B | $0.08/M | $0.35/M | Simple tasks, classification |
| 2 | GPT-4o mini | $0.15/M | $0.60/M | Chat, summaries, drafts |
| 3 | GPT-5.4 nano | $0.20/M | $1.25/M | Fast inference, high volume |
| 4 | GPT-oss 120B | $0.15/M | $0.60/M | Code, reasoning (open-weight) |
| 5 | GPT-5 mini | $0.25/M | $2.00/M | Balanced quality/cost |
| 6 | GPT-5.4 mini | $0.75/M | $4.50/M | Complex tasks, good quality |
| 7 | GPT-4o | $2.50/M | $10.00/M | Multimodal, vision |
| 8 | GPT-5 | $1.25/M | $10.00/M | High-quality general tasks |
| 9 | GPT-5.4 | $2.50/M | $15.00/M | Advanced reasoning |
| 10 | GPT-5.5 | $5.00/M | $30.00/M | Flagship, most capable |
💡 The Big Insight
GPT-oss 20B is 62x cheaper than GPT-5.5 for input tokens. If you're using GPT-5.5 for tasks that don't require flagship quality, you're overpaying by thousands of dollars per year.
Real Cost Examples
Here's what you'd pay per month at different usage levels (assuming 75% input, 25% output token ratio):
| Model | 100K tokens/mo | 1M tokens/mo | 10M tokens/mo |
|---|---|---|---|
| GPT-oss 20B | $0.01 | $0.10 | $1.03 |
| GPT-4o mini | $0.02 | $0.19 | $1.88 |
| GPT-5 mini | $0.06 | $0.63 | $6.25 |
| GPT-4o | $0.19 | $1.88 | $18.75 |
| GPT-5.4 | $0.34 | $3.44 | $34.38 |
| GPT-5.5 | $0.69 | $6.88 | $68.75 |
Which GPT Model Should You Use?
For chatbots and customer support: GPT-4o mini ($0.15/M input) handles most conversations well. Upgrade to GPT-5 mini only if you need better reasoning.
For code generation: GPT-5 mini ($0.25/M input) or GPT-5.4 mini ($0.75/M input) for complex code. GPT-oss 120B is a cheap open-weight alternative.
For document analysis: GPT-4o ($2.50/M input) if you need vision. GPT-5 ($1.25/M input) for text-only long documents.
For research and complex reasoning: GPT-5.4 ($2.50/M input) or GPT-5.5 ($5.00/M input) only when you need maximum capability.
Find YOUR cheapest model
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Run Free Cost Audit →How to Reduce Your GPT API Costs
1. Right-size your model. Most GPT-5.5 usage can be handled by GPT-5 mini at 95% less cost. Run an audit to find out.
2. Use caching. OpenAI's prompt caching reduces input costs by 50% for repeated prompts.
3. Batch your requests. Batch API gives 50% off for non-urgent workloads.
4. Monitor for new models. OpenAI launches cheaper models regularly. The GPT-5.4 nano ($0.20/M) didn't exist 6 months ago.
🔒 Pro Tip: Set Up Price Alerts
APIpulse Pro monitors all GPT models 24/7. When OpenAI drops prices or launches a cheaper model, you get an email with exact savings and migration code ready to paste. Get Pro for $19 →