Prices at each model size
Per million tokens, standard tier, short prompts. Sizes are a rough match by price and how each provider positions the model, not a claim that two models do equally well.
| Size | OpenAI | |
|---|---|---|
| Largest | GPT-5.5: $5 in, $30 out | Gemini 4 Argon: $2 in, $10 out |
| Large | GPT-6.1 Sol: $2 in, $10 out | Gemini 3.1 Pro Preview: $2 in, $12 out |
| Mid | GPT-6.1 Terra: $1 in, $5 out | Gemini 3.8 Flash: $0.75 in, $3.75 out |
| Small | GPT-5 nano: $0.05 in, $0.40 out | Gemini 2.5 Flash-Lite: $0.10 in, $0.40 out |
Two Gemini prices end soon
Gemini 4 Argon is on a launch price through November 30, 2026, then doubles to $4 in and $20 out. Gemini 3.8 Flash is on a launch price through December 31, 2026, then doubles to $1.50 in and $7.50 out. The tables use today's price; budget for the later one.
The same workload on both
The example is 20 million input tokens and 4 million output tokens a month, prompts around 4,000 tokens, at list price.
| Model | Input | Output | Per month |
|---|---|---|---|
| GPT-5.5 | $100 | $120 | $220 |
| Gemini 4 Argon | $40.00 | $40.00 | $80.00 |
| GPT-6.1 Sol | $40.00 | $40.00 | $80.00 |
| Gemini 3.1 Pro Preview | $40.00 | $48.00 | $88.00 |
| GPT-6.1 Terra | $20.00 | $20.00 | $40.00 |
| Gemini 3.8 Flash | $15.00 | $15.00 | $30.00 |
| GPT-5 nano | $1.00 | $1.60 | $2.60 |
| Gemini 2.5 Flash-Lite | $2.00 | $1.60 | $3.60 |
Caching and batch rules
OpenAI caches repeated prompt starts on its own, charges nothing to write the cache, and lists cached input at a tenth of the input price on GPT-5.5. Google lists cached input at a tenth of the input price on most Gemini models. Both run batch jobs at half the standard price.
The same workload with half the input cached, and in batch:
| Model | List price | 50 in 100 input tokens cached | Batch price |
|---|---|---|---|
| GPT-5.5 | $220 | $175 | $110 |
| Gemini 4 Argon | $80.00 | $61.00 | $40.00 |
| GPT-6.1 Sol | $80.00 | $61.00 | $40.00 |
| Gemini 3.1 Pro Preview | $88.00 | $70.00 | $44.00 |
| GPT-6.1 Terra | $40.00 | $30.50 | $20.00 |
| Gemini 3.8 Flash | $30.00 | $23.25 | $15.00 |
| GPT-5 nano | $2.60 | $2.15 | $1.30 |
| Gemini 2.5 Flash-Lite | $3.60 | $2.70 | $1.80 |
The fine print
- Gemini 3.1 Pro Preview charges more once a prompt passes 200K tokens. Several GPT models charge more above 272K tokens.
- Gemini output prices include thinking tokens.
- FUSR.ai does not route to Gemini today. Google prices are here so you can compare.
Where to go next
Ways to lower the OpenAI bill are in how to cut your OpenAI API costs, and every model is on LLM API pricing.