Gemini 3.1 Pro vs GPT-4.1: pricing & cost comparison
Both models charge $2 per million input tokens. On output, GPT-4.1 is 33% cheaper ($12 vs $8) — and since output is usually the dominant cost driver, that gap matters more than it looks.
Side by side
| Gemini 3.1 Pro | GPT-4.1 | |
|---|---|---|
| Input / 1M tokens | $2 | $2 |
| Output / 1M tokens | $12 | $8 |
| Context window | 1,000,000 | 1,047,576 |
| Token-count accuracy | ±3% | exact |
| Cost — 10,000 input + 2,000 output tokens | $0.044 | $0.036 |
What a real request costs
Take a representative turn — 10,000 input + 2,000 output tokens. Gemini 3.1 Pro comes to $0.044, GPT-4.1 to $0.036. Across 100,000 requests that's a $800 swing in favour of GPT-4.1. To run the numbers on your actual prompt, paste it into the calculator and toggle Compare across all models.
Close call — decide on output cost
Gemini 3.1 Pro and GPT-4.1 are close enough on price that the tie-breakers matter more than the headline rate. Output tokens are usually the dominant cost driver, so weigh $12 vs $8 per 1M output first, then context window — GPT-4.1 carries the larger one at 1,047,576 tokens. They're different vendors, so factor in a small tokenizer calibration buffer on whichever side isn't exact.
See the full breakdown on the dedicated pages for Gemini 3.1 Pro and GPT-4.1.
FAQ
- Is Gemini 3.1 Pro or GPT-4.1 cheaper?
- For a typical request (10,000 input + 2,000 output tokens), GPT-4.1 is cheaper — about 18% less, or roughly $800 saved per 100,000 requests. Gemini 3.1 Pro runs $2/$12 per 1M input/output tokens; GPT-4.1 runs $2/$8.
- Which has the larger context window?
- GPT-4.1, at 1,047,576 tokens versus 1,000,000.
- How accurate are these token counts?
- Gemini 3.1 Pro: Approximated with o200k_base; drift typically ~3% on English and code. GPT-4.1: Exact tokenization via the canonical OpenAI vocab (o200k_base). The dollar math itself is exact once the token count is known.
Both prices are computed from tokenmath's verified pricing table. Rates sourced from ai.google.dev and openai.com, verified 2026-07-06. Vendor pricing changes often — confirm before you commit.