Grok-3 vs o3 Mini
Grok-3 (2026) and o3 Mini (2025) are frontier-tier reasoning models from xAI and OpenAI. Grok-3 ships a 1M-token context window, while o3 Mini ships a not-yet-sourced context window. On MMLU PRO, Grok-3 leads by a hair. On pricing, Grok-3 costs $0.8/1M input tokens versus $1.1/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Grok-3 is safer overall; choose o3 Mini when coding workflow support matters.
Specs
Pricing and availability
| Grok-3 | o3 Mini | |
|---|---|---|
| Input price | $0.8/1M tokens | $1.1/1M tokens |
| Output price | $2.4/1M tokens | $4.4/1M tokens |
| Providers |
Capabilities
| Grok-3 | o3 Mini | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | Grok-3 | o3 Mini |
|---|---|---|
| MMLU PRO | 79.9 | 79.1 |
| Chatbot Arena | 1405.0 | 1335.0 |
| Aider Polyglot | 53.3 | 60.4 |
Deep dive
On shared benchmark coverage, MMLU PRO has Grok-3 at 79.9 and o3 Mini at 79.1, with Grok-3 ahead by 0.8 points; Chatbot Arena has Grok-3 at 1405 and o3 Mini at 1335, with Grok-3 ahead by 70 points; Aider Polyglot has Grok-3 at 53.3 and o3 Mini at 60.4, with o3 Mini ahead by 7.1 points. The largest visible gap is 70 points on Chatbot Arena, 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: Grok-3, multimodal input: Grok-3, and code execution: o3 Mini. Both models share reasoning mode, function calling, tool use, and 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 lists $0.8/1M input and $2.4/1M 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 lower by about $0.81 per million blended tokens. Availability is 3 providers versus 3, so concentration risk also matters.
Choose Grok-3 when vision-heavy evaluation and lower input-token cost are central to the workload. Choose o3 Mini 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, Grok-3 or o3 Mini?
Grok-3 is cheaper on tracked token pricing. Grok-3 costs $0.8/1M input and $2.4/1M 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 or o3 Mini open source?
Grok-3 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 vision, Grok-3 or o3 Mini?
Grok-3 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, Grok-3 or o3 Mini?
Grok-3 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 or o3 Mini?
Both Grok-3 and o3 Mini expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run Grok-3 and o3 Mini?
Grok-3 is available on OpenRouter, xAI Console, and Chutes AI. 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.