Gemini 2.5 Pro Preview 06-05 vs o3-pro
Gemini 2.5 Pro Preview 06-05 (2025) and o3-pro (2025) are frontier reasoning models from Google DeepMind and OpenAI. Gemini 2.5 Pro Preview 06-05 ships a 1M-token context window, while o3-pro ships a not-yet-sourced context window. On Aider Polyglot, o3-pro leads by 5.8 pts. On pricing, Gemini 2.5 Pro Preview 06-05 costs $1.25/1M input tokens versus $20/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Gemini 2.5 Pro Preview 06-05 is ~1500% cheaper at $1.25/1M; pay for o3-pro only for coding workflow support.
Specs
| Released | 2025-03-25 | 2025-06-10 |
| Context window | 1M | — |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Unknown | Proprietary |
| Knowledge cutoff | - | 2025-08 |
Pricing and availability
| Gemini 2.5 Pro Preview 06-05 | o3-pro | |
|---|---|---|
| Input price | $1.25/1M tokens | $20/1M tokens |
| Output price | $10/1M tokens | $80/1M tokens |
| Providers |
Capabilities
| Gemini 2.5 Pro Preview 06-05 | o3-pro | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | Gemini 2.5 Pro Preview 06-05 | o3-pro |
|---|---|---|
| Aider Polyglot | 79.1 | 84.9 |
Deep dive
On shared benchmark coverage, Aider Polyglot has Gemini 2.5 Pro Preview 06-05 at 79.1 and o3-pro at 84.9, with o3-pro ahead by 5.8 points. The largest visible gap is 5.8 points on Aider Polyglot, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on vision: o3-pro, multimodal input: o3-pro, reasoning mode: o3-pro, function calling: o3-pro, and tool use: o3-pro. Both models share structured outputs and code execution, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Gemini 2.5 Pro Preview 06-05 lists $1.25/1M input and $10/1M output tokens, while o3-pro lists $20/1M input and $80/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Gemini 2.5 Pro Preview 06-05 lower by about $34.13 per million blended tokens. Availability is 1 providers versus 1, so concentration risk also matters.
Choose Gemini 2.5 Pro Preview 06-05 when coding workflow support and lower input-token cost are central to the workload. Choose o3-pro when coding workflow support are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which is cheaper, Gemini 2.5 Pro Preview 06-05 or o3-pro?
Gemini 2.5 Pro Preview 06-05 is cheaper on tracked token pricing. Gemini 2.5 Pro Preview 06-05 costs $1.25/1M input and $10/1M output tokens. o3-pro costs $20/1M input and $80/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini 2.5 Pro Preview 06-05 or o3-pro open source?
Gemini 2.5 Pro Preview 06-05 is listed under Unknown. o3-pro is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Gemini 2.5 Pro Preview 06-05 or o3-pro?
o3-pro has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, Gemini 2.5 Pro Preview 06-05 or o3-pro?
o3-pro has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for reasoning mode, Gemini 2.5 Pro Preview 06-05 or o3-pro?
o3-pro has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Gemini 2.5 Pro Preview 06-05 and o3-pro?
Gemini 2.5 Pro Preview 06-05 is available on OpenRouter. o3-pro is available on OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Continue comparing
Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.