budget
Gpt 5 Mini vs Gemini 2.5 Flash
Side-by-side pricing, context window, features, and per-use-case verdict. Data sourced from LiteLLM, updated regularly.
Specifications
| Feature | Gpt 5 Mini | Gemini 2.5 Flash |
|---|---|---|
| Provider | openai | vertex ai-language-models |
| Model ID | gpt-5-mini | gemini-2.5-flash |
| Input / 1M tokens | $0.25 (17% cheaper) | $0.30 |
| Output / 1M tokens | $2.00 (20% cheaper) | $2.50 |
| Cached input / 1M | $0.02 | $0.03 |
| Context window | 272kk tokens | 1049kk tokens |
| Max output | 128kk tokens | 66kk tokens |
| Vision | ✅ | ✅ |
| Function calling | ✅ | ✅ |
| Prompt caching | ✅ | ✅ |
| Web search | ✅ | ✅ |
| JSON schema | ✅ | ✅ |
Monthly cost comparison
No cache discount applied — pure token costs at three usage scales.
| Scale | Gpt 5 Mini | Gemini 2.5 Flash | Winner |
|---|---|---|---|
| Small 1M in / 0.2M out | $0.65 | $0.80 | Gpt 5 Mini saves 19% |
| Medium 10M in / 2M out | $6.50 | $8.00 | Gpt 5 Mini saves 19% |
| Large 100M in / 20M out | $65.00 | $80.00 | Gpt 5 Mini saves 19% |
Category winners
Cheapest input
Gpt 5 Mini
$0.25/M
· 17% less than the other
Cheapest output
Gpt 5 Mini
$2.00/M
· 20% less than the other
Larger context
Gemini 2.5 Flash
1049kk tokens · 286% larger window
More features
Gpt 5 Mini
5 / 5 capabilities
(tied)
Better for…
High-volume RAG & repeated context
$0.02/M cached input — prompt caching makes repeated context retrieval significantly cheaper
Gpt 5 Mini
Short interactions & high-throughput APIs
$2.00/M output — 20% cheaper on output at scale
Gpt 5 Mini
Long-document processing & large codebases
1049k context window vs 272k — 286% larger context
Gemini 2.5 Flash
Cost-sensitive production at scale
$65.00/month at 100M-token scale — 19% cheaper than the alternative
Gpt 5 Mini
Deep-dive on each model
Pricing data sourced from LiteLLM and refreshed regularly. Always verify with each provider's official pricing page before making business decisions.