GPT-5 mini vs Gemini 2.5 Flash: cost
For a typical support chatbot, GPT-5 mini is about 1.2× cheaper than Gemini 2.5 Flash ($24.19 vs $29.93 per month). Price is only one factor: test both on your own prompts before switching.
| GPT-5 mini | Gemini 2.5 Flash | |
|---|---|---|
| Input /1M | $0.25 | $0.30 |
| Output /1M | $2.00 | $2.50 |
| Cached input /1M | $0.025 | $0.03 |
| Batch input /1M | $0.125 | $0.15 |
| Batch output /1M | $1.00 | $1.25 |
| Context | 272,000 | 1,048,576 |
Monthly cost by workload
| Scenario (per month) | GPT-5 mini | Gemini 2.5 Flash |
|---|---|---|
| Customer support chatbot 1,000 req/day · 1,500 in · 300 out | $24.19 | $29.93 |
| RAG over documents 500 req/day · 6,000 in · 400 out | $28.43 | $34.71 |
| Agent loop (10 calls/task, 200 tasks) 2,000 req/day · 8,000 in · 500 out | $104 | $128 |
| Batch summarization 10,000 req/day · 3,000 in · 200 out · batch | $172 | $210 |