ModelRefs / o3 vs Gemini 2.5 Flash — Benchmarks, Pricing & Coding Compa…
o3 vs Gemini 2.5 Flash — Benchmarks, Pricing & Coding Compa…
o3 vs Gemini 2.5 Flash: side-by-side benchmarks, pricing, context windows, coding ability and deployment. Pick the right model for your stack.
Overview
o3: o3 is OpenAI's extended-thinking reasoning model, applying deliberate chain-of-thought computation to excel on mathematics, science, and competitive programming tasks. Released in April 2025, it introduced OpenAI's scalable test-time compute approach at production scale.
Context window: Gemini 2.5 Flash accepts up to 1,000,000 tokens, o3 up to 200,000. Confirm the limit for your specific deployment channel before relying on it.
Gemini 2.5 Flash vs o3 at a glance
| Attribute | Gemini 2.5 Flash | o3 |
|---|---|---|
| Provider | OpenAI | |
| Released | 2025-03-01 | 2025-04-01 |
| Context window | 1,000,000 tokens | 200,000 tokens |
| Input price | $0.075/M tokens | $10/M tokens |
| Output price | $0.3/M tokens | $40/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 | o3 | Reported |
|---|---|---|---|
| gpqa | 82.8 | 82.8 | Date not published |
Scores are as published by their cited sources on the dates shown. Different runs use different harnesses, prompts, and dates, so treat these as directional evidence rather than a head-to-head result.
Where they differ most
- Cost Efficiency: Gemini 2.5 Flash 95%, o3 13%. Gemini 2.5 Flash leads on this dimension.
- Reasoning: Gemini 2.5 Flash 83%, o3 83%. Both score the same 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 o3 vs Gemini 2.5 Flash — Benchmarks, Pricing & Coding Compa….
Frequently asked questions
Which is better, o3 or Gemini 2.5 Flash?
o3 and Gemini 2.5 Flash target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is o3 cheaper than Gemini 2.5 Flash?
Compare $0.0100 vs $0.00007 on this page.