Gemini 2.5 Pro Preview 06-05 vs o3 Mini
Gemini 2.5 Pro Preview 06-05 (2025) and o3 Mini (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 Mini ships a not-yet-sourced context window. On Aider Polyglot, Gemini 2.5 Pro Preview 06-05 leads by 18.7 pts. On pricing, o3 Mini costs $1.1/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Pick Gemini 2.5 Pro Preview 06-05 for coding; o3 Mini is better when coding workflow support matters more.
Specs
| Released | 2025-03-25 | 2025-03-31 |
| Context window | 1M | — |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Unknown | Unknown |
| Knowledge cutoff | - | 2025-04 |
Pricing and availability
| Gemini 2.5 Pro Preview 06-05 | o3 Mini | |
|---|---|---|
| Input price | $1.25/1M tokens | $1.1/1M tokens |
| Output price | $10/1M tokens | $4.4/1M tokens |
| Providers |
Capabilities
| Gemini 2.5 Pro Preview 06-05 | o3 Mini | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | Gemini 2.5 Pro Preview 06-05 | o3 Mini |
|---|---|---|
| Aider Polyglot | 79.1 | 60.4 |
Deep dive
On shared benchmark coverage, Aider Polyglot has Gemini 2.5 Pro Preview 06-05 at 79.1 and o3 Mini at 60.4, with Gemini 2.5 Pro Preview 06-05 ahead by 18.7 points. The largest visible gap is 18.7 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 reasoning mode: o3 Mini, function calling: o3 Mini, and tool use: o3 Mini. 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 Mini lists $1.1/1M input and $4.4/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts o3 Mini lower by about $1.79 per million blended tokens. Availability is 1 providers versus 3, so concentration risk also matters.
Choose Gemini 2.5 Pro Preview 06-05 when coding workflow support are central to the workload. Choose o3 Mini when coding workflow support, lower input-token cost, and broader provider choice 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 Mini?
o3 Mini is cheaper on tracked token pricing. Gemini 2.5 Pro Preview 06-05 costs $1.25/1M input and $10/1M output tokens. o3 Mini costs $1.1/1M input and $4.4/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini 2.5 Pro Preview 06-05 or o3 Mini open source?
Gemini 2.5 Pro Preview 06-05 is listed under Unknown. o3 Mini is listed under Unknown. 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 reasoning mode, Gemini 2.5 Pro Preview 06-05 or o3 Mini?
o3 Mini 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.
Which is better for function calling, Gemini 2.5 Pro Preview 06-05 or o3 Mini?
o3 Mini has the clearer documented function calling signal in this comparison. If function calling is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for tool use, Gemini 2.5 Pro Preview 06-05 or o3 Mini?
o3 Mini has the clearer documented tool use signal in this comparison. If tool use 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 Mini?
Gemini 2.5 Pro Preview 06-05 is available on OpenRouter. o3 Mini is available on OpenRouter, OpenAI Batch API, and Azure OpenAI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-04-27. Data sourced from public model cards and provider documentation.