GPT-4.1 vs Gemini 2.5 Pro — LLM API Cost Comparison
Compare GPT-4.1 (OpenAI) vs Gemini 2.5 Pro (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
- $2/1M tokens
- Output
- $8/1M tokens
- Context
- 1M tokens
- Released
- 2025-04
Recommended production model (replaced GPT-4o); 1M context
- Input
- $1.25/1M tokens
- Output
- $10/1M tokens
- Context
- 1M tokens
- Released
- 2025-09
Stable release; strong coding & complex reasoning
Monthly Cost by Usage Tier (70% input / 30% output ratio)
| Usage | GPT-4.1 | Gemini 2.5 Pro | Cheaper by |
|---|---|---|---|
| Light (1M tokens) | $3.80 | $3.88 | GPT-4.1 (2%) |
| Moderate (10M tokens) | $38.00 | $38.75 | GPT-4.1 (2%) |
| Heavy (100M tokens) | $380 | $388 | GPT-4.1 (2%) |
| Very Heavy (1B tokens) | $3,800 | $3,875 | GPT-4.1 (2%) |
Frequently Asked Questions
Which is cheaper — GPT-4.1 or Gemini 2.5 Pro?
For input tokens, Gemini 2.5 Pro is cheaper at $1.25/1M tokens — 1.6× less than $2/1M. For output tokens, GPT-4.1 wins at $8/1M vs $10/1M. At heavy workloads (100M tokens/month), the cost difference can be significant.
What is the context window difference between GPT-4.1 and Gemini 2.5 Pro?
GPT-4.1 supports 1,000,000 tokens per request; Gemini 2.5 Pro supports 1,000,000 tokens. GPT-4.1 wins on context length, making it better for long documents, large codebases, or extended conversations without chunking.
When should I choose GPT-4.1 over Gemini 2.5 Pro?
Choose GPT-4.1 (OpenAI) if you prefer OpenAI's ecosystem, tooling, or reliability track record. Recommended production model (replaced GPT-4o); 1M context. Choose Gemini 2.5 Pro (Google) if Stable release; strong coding & complex reasoning. 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 vs Gemini 2.5 Pro?
At 700M input + 300M output tokens (1B total): GPT-4.1 costs $3800; Gemini 2.5 Pro costs $3875. The difference is $75/billion tokens at this 70/30 input/output ratio.