GPT-5 mini vs Gemini 3.5 Flash
Budget vs mid-tier AI models head-to-head. GPT-5 mini is 83% cheaper on input ($0.25 vs $1.50) and 78% cheaper on output ($2.00 vs $9.00). Gemini 3.5 Flash counters with a 1M context window — 3.7x larger than GPT-5 mini's 272K.
Pricing data verified: 2026-06-21
| Specification | GPT-5 mini (OpenAI) | Gemini 3.5 Flash (Google) |
|---|---|---|
| Input Price (per 1M tokens) | $0.25 | $1.50 |
| Output Price (per 1M tokens) | $2.00 | $9.00 |
| Context Window | 272K | 1M |
| Tier | Budget | Mid |
| Provider | OpenAI |
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Which Model for Which Use Case?
Cost-Sensitive Workloads
GPT-5 mini dominates on price: 83% cheaper on input ($0.25 vs $1.50/M) and 78% cheaper on output ($2.00 vs $9.00/M). For high-volume classification, search, or any budget-conscious workload, GPT-5 mini is the clear winner.
Long Context Tasks
Gemini 3.5 Flash's 1M token context window is 3.7x larger than GPT-5 mini's 272K. For processing long documents, entire codebases, or maintaining extended conversation history, Gemini handles far more context.
High-Volume Production
At scale, GPT-5 mini's pricing advantage is massive. Running 10,000 requests/day with 1K input and 500 output tokens costs about $375/mo on GPT-5 mini vs $1,800/mo on Gemini 3.5 Flash — a 79% savings.
Multimodal & Google Cloud
Gemini 3.5 Flash offers Google's multimodal capabilities and tight integration with Google Cloud services. If you need image/video understanding or are invested in GCP, Gemini's ecosystem may justify the premium.
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Frequently Asked Questions
Is GPT-5 mini cheaper than Gemini 3.5 Flash?
Yes, significantly. GPT-5 mini costs $0.25/M input (83% cheaper than Gemini 3.5 Flash's $1.50/M) and $2.00/M output (78% cheaper than Gemini 3.5 Flash's $9.00/M). For most workloads, GPT-5 mini costs a fraction of what Gemini 3.5 Flash costs.
When would I choose Gemini 3.5 Flash over GPT-5 mini?
Choose Gemini 3.5 Flash when you need a 1M token context window (3.7x larger than GPT-5 mini's 272K), Google's multimodal capabilities, or tight integration with Google Cloud. For long documents, large codebases, or extended conversations, Gemini's context window is the deciding factor.
Which model has a better context window?
Gemini 3.5 Flash has a 1M token context window — 3.7x larger than GPT-5 mini's 272K. If your workload requires processing very long documents or maintaining extended conversation history, Gemini 3.5 Flash is the clear winner on context.
How much can I save by choosing GPT-5 mini over Gemini 3.5 Flash?
For a typical workload of 1,000 input tokens and 500 output tokens at 1,000 requests per day, GPT-5 mini costs roughly $37.50/month vs Gemini 3.5 Flash's $180/month — saving you about $142/month or roughly 79%. The savings scale linearly with volume.