Model vs Model · Cheapest tier
Gemini 2.5 Flash vs GPT-4.1 miniFlash wins on input. Mini wins on output.
Verdict
Gemini 2.5 Flash is cheaper on input ($0.3 vs $0.4 per 1M tokens). GPT-4.1 mini is cheaper on output ($1.6 vs $2.5). The winner depends on your workload ratio. Input-heavy tasks (document processing, RAG) favour Flash. Output-heavy tasks (generation, writing) favour GPT-4.1 mini.
API pricing — March 2026
| Gemini 2.5 Flash | GPT-4.1 mini | |
|---|---|---|
| Input price /1M tokens | $0.3 | $0.4 |
| Output price /1M tokens | $2.5 | $1.6 |
| Context window | 1M tokens | 1M tokens |
| Best for input-heavy | Yes ✓ | No |
| Best for output-heavy | No | Yes ✓ |
| Batch discount | Yes | Yes |
Cost depends on your input/output ratio
Document processing — input-heavy
Summarising documents. 80% input, 20% output. 100M total tokens/month.
Gemini 2.5 Flash
$74
80M in + 20M out tokens
GPT-4.1 mini
$64
80M in + 20M out tokens
Content generation — output-heavy
Generating articles or responses. 20% input, 80% output. 100M total tokens/month.
Gemini 2.5 Flash
$206
20M in + 80M out tokens
GPT-4.1 mini
$136
20M in + 80M out tokens
When to choose each
Gemini 2.5 Flash
Input-heavy workloads (RAG, summarisation)
Large document processing
Already on Google Cloud stack
Multimodal inputs needed
GPT-4.1 mini
Output-heavy workloads (generation, writing)
1M context window at same tier
OpenAI ecosystem integration
General-purpose budget tasks
Get your exact number
Enter your input/output ratio for a personalised verdict.
Prices updated daily · Last fetch: Mar 26, 2026
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