Comparison · 2026-06-29
GPT-5 Mini vs Gemini 2.5 Flash
Side-by-side comparison of pricing, context window and capabilities for GPT-5 Mini (OpenAI) and Gemini 2.5 Flash (Google). Focus: cheap vs premium.
| GPT-5 Mini | Gemini 2.5 Flash | |
|---|---|---|
| Vendor | OpenAI | |
| Input price / 1M tokens | $0.250 | $0.300 |
| Output price / 1M tokens | $2.00 | $2.50 |
| Total per 1M (in + out) | $2.25 | $2.80 |
| Context window | 400K | 1.05M |
| Max output tokens | 128K | 66K |
| Tool calling | ✓ Yes | ✓ Yes |
| Structured output | ✓ Yes | ✓ Yes |
| Reasoning | ✓ Yes | ✓ Yes |
| Vision input | ✓ Yes | ✓ Yes |
| Open weights | ✗ No | ✗ No |
| Provider availability | 27 providers | 27 providers |
| Release date | 2025-08-07 | 2025-06-17 |
| Knowledge cutoff | 2024-05-30 | 2025-01 |
Quick takeaway
- GPT-5 Mini is 1.2× cheaper per 1M tokens (input + output combined).
- Gemini 2.5 Flash has a larger context window (1.05M vs 400K).
How to read this comparison
This page compares GPT-5 Mini and Gemini 2.5 Flash on the dimensions that matter most for production LLM selection: per-token cost, context window, declared capabilities (tool calling, structured output, reasoning, vision), and provider availability.
Green highlights in the table indicate which model leads on a given row. "Leads" means lower price or higher context/capability — not necessarily "better for your use case". A model that costs 3× more may still be the right choice if it unlocks a capability you need.
What this comparison does NOT tell you
- Quality / accuracy — we have no benchmark data. Declared capabilities ≠ measured performance.
- Latency — time-to-first-token varies by provider, region and load. Test with your actual traffic.
- Prompt caching savings — if you reuse system prompts, the cheaper model on headline rate may not be cheapest in practice.
- Fine-tuning availability — not all models can be fine-tuned, even if they are open-weight.
Data is refreshed daily. If a model's capabilities or pricing change, this page updates automatically on the next build cycle.
Frequently asked questions
Is GPT-5 Mini cheaper than Gemini 2.5 Flash?
GPT-5 Mini costs $0.250/1M tokens input + $2.00/1M tokens output, while Gemini 2.5 Flash costs $0.300/1M tokens input + $2.50/1M tokens output. GPT-5 Mini is cheaper per combined 1M tokens.
Which model has a longer context window, GPT-5 Mini or Gemini 2.5 Flash?
Gemini 2.5 Flash supports a longer context window — 1,048,576 tokens vs 400,000 tokens.
Where can I run GPT-5 Mini and Gemini 2.5 Flash?
GPT-5 Mini is available on 27 providers; Gemini 2.5 Flash is available on 27 providers. See each model's detail page for the full provider list.
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Prices in USD per 1M tokens. Unknown means the provider does not publish per-token pricing.
Pricing and capabilities are refreshed daily and reconciled against each provider's official documentation. Always verify critical production decisions with the provider directly.