Gemini 2.5 Pro Preview 05-06 vs o3 Mini
Gemini 2.5 Pro Preview 05-06 (2025) and o3 Mini (2025) are frontier reasoning models from Google DeepMind and OpenAI. Gemini 2.5 Pro Preview 05-06 ships a 1m-token context window, while o3 Mini ships a 200k-token context window. On pricing, o3 Mini costs $1.10/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Gemini 2.5 Pro Preview 05-06 fits 5x more tokens; pick it for long-context work and o3 Mini for tighter calls.
Decision scorecard
Local evidence first| Signal | Gemini 2.5 Pro Preview 05-06 | o3 Mini |
|---|---|---|
| Best for | multimodal apps and long-context analysis | reasoning-heavy apps, tool-calling agents, and provider-routed production |
| Decision fit | RAG, Long context, and Vision | Coding, RAG, and Agents |
| Context window | 1m | 200k |
| Cheapest output | $10/1M tokens | $4.40/1M tokens |
| Provider routes | 1 tracked | 4 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Gemini 2.5 Pro Preview 05-06 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 2.5 Pro Preview 05-06 uniquely exposes Vision and Multimodal in local model data.
- Local decision data tags Gemini 2.5 Pro Preview 05-06 for RAG, Long context, and Vision.
- o3 Mini has the lower cheapest tracked output price at $4.40/1M tokens.
- o3 Mini has broader tracked provider coverage for fallback and procurement flexibility.
- o3 Mini uniquely exposes Reasoning, Function calling, and Tool use in local model data.
- Local decision data tags o3 Mini for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Gemini 2.5 Pro Preview 05-06
$3,500
Cheapest tracked route/tier: OpenRouter
o3 Mini
$1,980
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $1,520. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- o3 Mini is $5.60/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision and Multimodal before moving production traffic.
- o3 Mini adds Reasoning, Function calling, and Tool use in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Gemini 2.5 Pro Preview 05-06 is $5.60/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Reasoning, Function calling, and Tool use before moving production traffic.
- Gemini 2.5 Pro Preview 05-06 adds Vision and Multimodal in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-05-06 | 2025-01-31 |
| Context window | 1m | 200k |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use with conditions | Commercial use with conditions |
| Knowledge cutoff | 2025-01 | 2025-04 |
Pricing and availability
| Pricing attribute | Gemini 2.5 Pro Preview 05-06 | o3 Mini |
|---|---|---|
| Input price | $1.25/1M tokens | $1.10/1M tokens |
| Output price | $10/1M tokens | $4.40/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 2.5 Pro Preview 05-06 | o3 Mini |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | No | Yes |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: Gemini 2.5 Pro Preview 05-06, multimodal input: Gemini 2.5 Pro Preview 05-06, reasoning mode: o3 Mini, function calling: o3 Mini, tool use: o3 Mini, and code execution: o3 Mini. Both models share structured outputs, 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 05-06 lists $1.25/1M input and $10/1M output tokens on the cheapest tracked provider, while o3 Mini lists $1.10/1M input and $4.40/1M 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 4, so concentration risk also matters.
Choose Gemini 2.5 Pro Preview 05-06 when long-context analysis and larger context windows 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 has a larger context window, Gemini 2.5 Pro Preview 05-06 or o3 Mini?
Gemini 2.5 Pro Preview 05-06 supports 1m tokens, while o3 Mini supports 200k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Gemini 2.5 Pro Preview 05-06 or o3 Mini?
o3 Mini is cheaper on tracked token pricing. Gemini 2.5 Pro Preview 05-06 costs $1.25/1M input and $10/1M output tokens. o3 Mini costs $1.10/1M input and $4.40/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini 2.5 Pro Preview 05-06 or o3 Mini open source?
Gemini 2.5 Pro Preview 05-06 is listed under Proprietary. o3 Mini 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 05-06 or o3 Mini?
Gemini 2.5 Pro Preview 05-06 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.
Which is better for multimodal input, Gemini 2.5 Pro Preview 05-06 or o3 Mini?
Gemini 2.5 Pro Preview 05-06 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.
Where can I run Gemini 2.5 Pro Preview 05-06 and o3 Mini?
Gemini 2.5 Pro Preview 05-06 is available on OpenRouter. o3 Mini is available on OpenRouter, Azure OpenAI, OpenAI API, and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-06-04. Data sourced from public model cards and provider documentation.