ModelRefs / Gemini 2.5 Flash vs o3 Pro
Gemini 2.5 Flash vs o3 Pro
Gemini 2.5 Flash vs o3 Pro: 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.
o3 Pro: o3 Pro is OpenAI's highest-capability reasoning model, applying extended compute at inference time to solve complex scientific, mathematical, and programming problems. It achieved the highest published scores on ARC-AGI-2 and competitive programming benchmarks at its June 2025 release.
Context window: Gemini 2.5 Flash accepts up to 1,000,000 tokens, o3 Pro up to 200,000. Confirm the limit for your specific deployment channel before relying on it.
Gemini 2.5 Flash vs o3 Pro at a glance
| Attribute | Gemini 2.5 Flash | o3 Pro |
|---|---|---|
| Provider | OpenAI | |
| Released | 2025-06-17 | 2025-06-10 |
| Context window | 1,000,000 tokens | 200,000 tokens |
| Input price | $0.075/M tokens | $20/M tokens |
| Output price | $0.3/M tokens | $80/M tokens |
| Licence | Proprietary | Proprietary |
| Self-hostable | No, hosted only | No, hosted only |
| Modalities | text, vision, audio | text, vision |
Where they differ most
- Reasoning: Gemini 2.5 Flash 86%, o3 Pro 32%. 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 o3 Pro.
Frequently asked questions
Which is better, Gemini 2.5 Flash or o3 Pro?
Gemini 2.5 Flash and o3 Pro target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is Gemini 2.5 Flash cheaper than o3 Pro?
Compare $0.00007 vs $0.0200 on this page.