GPT-4.1 Mini vs Gemini 2.5 Flash — LLM API Cost Comparison
Compare GPT-4.1 Mini (OpenAI) vs Gemini 2.5 Flash (Google) on cost per million tokens, context window, and monthly spend.
Prices verified 2026-05-20 · Pricing may change — use the calculator for current estimates
- Input
- $0.4/1M tokens
- Output
- $1.6/1M tokens
- Context
- 1M tokens
- Released
- 2025-04
Best mid-tier; 1M context window
- Input
- $0.3/1M tokens
- Output
- $2.5/1M tokens
- Context
- 1M tokens
- Released
- 2025-09
Hybrid reasoning; 1M context with thinking budgets
Monthly Cost by Usage Tier (70% input / 30% output ratio)
| Usage | GPT-4.1 Mini | Gemini 2.5 Flash | Cheaper by |
|---|---|---|---|
| Light (1M tokens) | $0.760 | $0.960 | GPT-4.1 Mini (21%) |
| Moderate (10M tokens) | $7.60 | $9.60 | GPT-4.1 Mini (21%) |
| Heavy (100M tokens) | $76.00 | $96.00 | GPT-4.1 Mini (21%) |
| Very Heavy (1B tokens) | $760 | $960 | GPT-4.1 Mini (21%) |
Frequently Asked Questions
Which is cheaper — GPT-4.1 Mini or Gemini 2.5 Flash?
For input tokens, Gemini 2.5 Flash is cheaper at $0.3/1M tokens — 1.3× less than $0.4/1M. For output tokens, GPT-4.1 Mini wins at $1.6/1M vs $2.5/1M. At heavy workloads (100M tokens/month), the cost difference can be significant.
What is the context window difference between GPT-4.1 Mini and Gemini 2.5 Flash?
GPT-4.1 Mini supports 1,000,000 tokens per request; Gemini 2.5 Flash supports 1,000,000 tokens. GPT-4.1 Mini wins on context length, making it better for long documents, large codebases, or extended conversations without chunking.
When should I choose GPT-4.1 Mini over Gemini 2.5 Flash?
Choose GPT-4.1 Mini (OpenAI) if you prefer OpenAI's ecosystem, tooling, or reliability track record. Best mid-tier; 1M context window. Choose Gemini 2.5 Flash (Google) if Hybrid reasoning; 1M context with thinking budgets. the price/performance fits your workload better. Use this calculator to find the break-even point for your exact token volume.
How much does 1 billion tokens cost on GPT-4.1 Mini vs Gemini 2.5 Flash?
At 700M input + 300M output tokens (1B total): GPT-4.1 Mini costs $760; Gemini 2.5 Flash costs $960. The difference is $200/billion tokens at this 70/30 input/output ratio.