Grok Code Fast 1 vs o3 Mini
Grok Code Fast 1 (2025) and o3 Mini (2025) are agentic coding models from xAI and OpenAI. Grok Code Fast 1 ships a 262K-token context window, while o3 Mini ships a not-yet-sourced context window. On pricing, Grok Code Fast 1 costs $0.2/1M input tokens versus $1.1/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Grok Code Fast 1 is ~450% cheaper at $0.2/1M; pay for o3 Mini only for coding workflow support.
Specs
| Released | 2025-08-27 | 2025-03-31 |
| Context window | 262K | — |
| Parameters | 314B | — |
| Architecture | mixture of experts | decoder only |
| License | Proprietary | Unknown |
| Knowledge cutoff | - | 2025-04 |
Pricing and availability
| Grok Code Fast 1 | o3 Mini | |
|---|---|---|
| Input price | $0.2/1M tokens | $1.1/1M tokens |
| Output price | $1.5/1M tokens | $4.4/1M tokens |
| Providers |
Capabilities
| Grok Code Fast 1 | 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 reasoning mode: o3 Mini and code execution: o3 Mini. Both models share 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 Code Fast 1 lists $0.2/1M input and $1.5/1M 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 Code Fast 1 lower by about $1.5 per million blended tokens. Availability is 1 providers versus 3, so concentration risk also matters.
Choose Grok Code Fast 1 when coding workflow support 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 Code Fast 1 or o3 Mini?
Grok Code Fast 1 is cheaper on tracked token pricing. Grok Code Fast 1 costs $0.2/1M input and $1.5/1M 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 Code Fast 1 or o3 Mini open source?
Grok Code Fast 1 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 reasoning mode, Grok Code Fast 1 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 Code Fast 1 or o3 Mini?
Both Grok Code Fast 1 and o3 Mini expose function calling. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for tool use, Grok Code Fast 1 or o3 Mini?
Both Grok Code Fast 1 and o3 Mini expose tool use. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Grok Code Fast 1 and o3 Mini?
Grok Code Fast 1 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: 2026-04-27. Data sourced from public model cards and provider documentation.