ModelRefs / Gemini 2.5 Flash vs o4 Mini
Gemini 2.5 Flash vs o4 Mini
Gemini 2.5 Flash vs o4 Mini: side-by-side benchmarks, pricing, context windows, coding ability and deployment. Pick the right model for your stack.
Overview
Gemini 2.5 Flash: Gemini 2.5 Flash is Google DeepMind's price-performance model for low-latency, high-volume work that still needs reasoning, with thinking supported. It accepts text, image, audio and video input across a 1,048,576-token context window, returns up to 65,536 tokens, and carries a January 2025 knowledge cutoff. Google now limits access to existing users while keeping the model served.
o4 Mini: o4 Mini is OpenAI's efficient reasoning model, adding vision support to the mini reasoning tier for agentic tasks needing both image understanding and step-by-step logic at low cost per task. It is now deprecated: OpenAI gives the o4-mini-2025-04-16 snapshot and the o4-mini alias a shutdown date of 23 October 2026, with gpt-5.6-terra as the substitute.
Context window: Gemini 2.5 Flash accepts up to 1,000,000 tokens, o4 Mini up to 200,000. Confirm the limit for your specific deployment channel before relying on it.
Gemini 2.5 Flash vs o4 Mini at a glance
| Attribute | Gemini 2.5 Flash | o4 Mini |
|---|---|---|
| Provider | OpenAI | |
| Released | 2025-06-17 | 2025-04-16 |
| Context window | 1,000,000 tokens | 200,000 tokens |
| Input price | $0.075/M tokens | $1.1/M tokens |
| Output price | $0.3/M tokens | $4.4/M tokens |
| Licence | Proprietary | Proprietary |
| Self-hostable | No, hosted only | No, hosted only |
| Modalities | text, vision, audio | text, vision |
Benchmarks reported for both
| Benchmark | Gemini 2.5 Flash | o4 Mini | Reported |
|---|---|---|---|
| GPQA Diamond (accuracy) | 82.8 | 77.6 | Date not published |
Each row compares the same benchmark, the same reported metric, and the same task set. Scores are as published by their cited sources on the dates shown. Different runs still use different harnesses and prompts, so treat these as directional evidence rather than a head-to-head result.
Where they differ most
- Cost Efficiency: Gemini 2.5 Flash 95%, o4 Mini 63%. Gemini 2.5 Flash leads on this dimension.
- Reasoning: Gemini 2.5 Flash 86%, o4 Mini 79%. Gemini 2.5 Flash leads on this dimension.
Capability scores are ModelRefs' own derived signals, not vendor claims or benchmark results. Validate against your own workload before relying on them.
Continue your research
Use these connected ModelRefs sections to compare alternatives, inspect implementation paths, and review the evidence and governance boundaries relevant to Gemini 2.5 Flash vs o4 Mini.
Frequently asked questions
Which is better, Gemini 2.5 Flash or o4 Mini?
Gemini 2.5 Flash and o4 Mini target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is Gemini 2.5 Flash cheaper than o4 Mini?
Compare $0.00007 vs $0.00110 on this page.