Grok 3 Mini vs o3 Mini
Grok 3 Mini (2025) and o3 Mini (2025) are frontier reasoning models from xAI and OpenAI. Grok 3 Mini ships a 131k-token context window, while o3 Mini ships a not-yet-sourced context window. On pricing, Grok 3 Mini costs $0.3/1M input tokens versus $1.1/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
Grok 3 Mini is ~267% cheaper at $0.3/1M; pay for o3 Mini only for coding workflow support.
Specs
| Released | 2025-02-17 | 2025-03-31 |
| Context window | 131k | — |
| Parameters | — | — |
| Architecture | - | decoder only |
| License | Proprietary | Unknown |
| Knowledge cutoff | - | 2025-04 |
Pricing and availability
| Grok 3 Mini | o3 Mini | |
|---|---|---|
| Input price | $0.3/1M tokens | $1.1/1M tokens |
| Output price | $0.5/1M tokens | $4.4/1M tokens |
| Providers |
Capabilities
| Grok 3 Mini | o3 Mini | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on multimodal input: Grok 3 Mini, 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, Grok 3 Mini lists $0.3/1M input and $0.5/1M 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 Grok 3 Mini lower by about $1.73 per million blended tokens. Availability is 1 providers versus 3, so concentration risk also matters.
Choose Grok 3 Mini when provider fit and lower input-token cost are central to the workload. Choose o3 Mini when coding workflow support 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. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which is cheaper, Grok 3 Mini or o3 Mini?
Grok 3 Mini is cheaper on tracked token pricing. Grok 3 Mini costs $0.3/1M input and $0.5/1M 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 Grok 3 Mini or o3 Mini open source?
Grok 3 Mini is listed under Proprietary. 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 multimodal input, Grok 3 Mini or o3 Mini?
Grok 3 Mini 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, Grok 3 Mini 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, Grok 3 Mini 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.
Where can I run Grok 3 Mini and o3 Mini?
Grok 3 Mini 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.
Continue comparing
Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.