Gemini 3.1 Pro vs OpenAI o4-mini

Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.

Gemini 3.1 Pro

Google · Mar 2026

Google's flagship with the industry's largest context window — 2M tokens — and frontier multimodal reasoning at $2/$12.

OpenAI o4-mini

OpenAI · Apr 2025

80.9

A compact reasoning model that punched far above its price on math — 92.7% on AIME 2025 at $1.10 per million input tokens.

The verdict

Gemini 3.1 Pro wins 1 of the 1 benchmarks these models share, against 0 for OpenAI o4-mini. OpenAI o4-mini is about 2.3x cheaper per blended million tokens (3:1 input:output mix). Gemini 3.1 Pro also takes 2M of context versus 200K for OpenAI o4-mini.

Benchmark head-to-head 10

SWE-bench Verified
~78%68.1%
Gemini 3.1 ProOpenAI o4-mini

Specs & pricing

Gemini 3.1 ProOpenAI o4-mini
modhub Index80.9
Input price / 1M$2$1.1
Output price / 1M$12$4.4
Context window2M200K
Max output66K100K
Open weightsnono
Reasoning modelyesyes
Multimodal inputtext, image, audio, videotext, image
Knowledge cutoffNov 2025May 2024
ReleasedMar 2026Apr 2025
Example monthly cost*$38.00$17.60

* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.

Frequently asked questions

Which is better, Gemini 3.1 Pro or OpenAI o4-mini?
Gemini 3.1 Pro wins 1 of the 1 benchmarks these models share, against 0 for OpenAI o4-mini. OpenAI o4-mini is about 2.3x cheaper per blended million tokens (3:1 input:output mix). Gemini 3.1 Pro also takes 2M of context versus 200K for OpenAI o4-mini.
Which is cheaper, Gemini 3.1 Pro or OpenAI o4-mini?
Gemini 3.1 Pro costs $2/$12 per million input/output tokens, while OpenAI o4-mini costs $1.1/$4.4. For a typical workload of 10M input and 1.5M output tokens per month, that's $38.00 versus $17.60.
Which model is better for coding, Gemini 3.1 Pro or OpenAI o4-mini?
On SWE-bench Verified — the standard agentic-coding benchmark — Gemini 3.1 Pro scores ~78% versus 68.1% for OpenAI o4-mini, making Gemini 3.1 Pro the stronger pick for coding agents.

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