GPT-5.4 Mini vs Gemini 3.1 Flash-Lite — LLM API Cost Comparison
Compare GPT-5.4 Mini (OpenAI) vs Gemini 3.1 Flash-Lite (Google) on cost per million tokens, context window, and monthly spend.
Prices verified 2026-05-23 · Pricing may change — use the calculator for current estimates
- Input
- $0.75/1M tokens
- Output
- $4.5/1M tokens
- Context
- 272K tokens
- Released
- 2026-03
Best mini model for coding, computer use, and subagents
- Input
- $0.25/1M tokens
- Output
- $1.5/1M tokens
- Context
- 1M tokens
- Released
- 2026-04
Most cost-efficient Gemini; high-volume agentic tasks
Monthly Cost by Usage Tier (70% input / 30% output ratio)
| Usage | GPT-5.4 Mini | Gemini 3.1 Flash-Lite | Cheaper by |
|---|---|---|---|
| Light (1M tokens) | $1.87 | $0.625 | Gemini 3.1 Flash-Lite (67%) |
| Moderate (10M tokens) | $18.75 | $6.25 | Gemini 3.1 Flash-Lite (67%) |
| Heavy (100M tokens) | $188 | $62.50 | Gemini 3.1 Flash-Lite (67%) |
| Very Heavy (1B tokens) | $1,875 | $625 | Gemini 3.1 Flash-Lite (67%) |
Frequently Asked Questions
Which is cheaper — GPT-5.4 Mini or Gemini 3.1 Flash-Lite?
For input tokens, Gemini 3.1 Flash-Lite is cheaper at $0.25/1M tokens — 3.0× less than $0.75/1M. For output tokens, Gemini 3.1 Flash-Lite wins at $1.5/1M vs $4.5/1M. At heavy workloads (100M tokens/month), the cost difference can be significant.
What is the context window difference between GPT-5.4 Mini and Gemini 3.1 Flash-Lite?
GPT-5.4 Mini supports 272,000 tokens per request; Gemini 3.1 Flash-Lite supports 1,000,000 tokens. Gemini 3.1 Flash-Lite wins on context length, making it better for long documents, large codebases, or extended conversations without chunking.
When should I choose GPT-5.4 Mini over Gemini 3.1 Flash-Lite?
Choose GPT-5.4 Mini (OpenAI) if you prefer OpenAI's ecosystem, tooling, or reliability track record. Best mini model for coding, computer use, and subagents. Choose Gemini 3.1 Flash-Lite (Google) if Most cost-efficient Gemini; high-volume agentic tasks. 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-5.4 Mini vs Gemini 3.1 Flash-Lite?
At 700M input + 300M output tokens (1B total): GPT-5.4 Mini costs $1875; Gemini 3.1 Flash-Lite costs $625. The difference is $1250/billion tokens at this 70/30 input/output ratio.