Grok 3 Mini vs Grok 4
Grok 3 Mini (2025) and Grok 4 (2025) are frontier reasoning models from xAI. Grok 3 Mini ships a 131k-token context window, while Grok 4 ships a 256k-token context window. On pricing, Grok 3 Mini costs $0.25/1M 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.
Grok 3 Mini is ~400% cheaper at $0.25/1M; pay for Grok 4 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Grok 3 Mini | Grok 4 |
|---|---|---|
| Best for | multimodal apps and provider-routed production | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | RAG, Long context, and Vision | Coding, RAG, and Agents |
| Context window | 131k | 256k |
| Cheapest output | $1.27/1M tokens | $2.50/1M tokens |
| Provider routes | 2 tracked | 4 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Grok 3 Mini has the lower cheapest tracked output price at $1.27/1M tokens.
- Local decision data tags Grok 3 Mini for RAG, Long context, and Vision.
- Grok 4 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Grok 4 has broader tracked provider coverage for fallback and procurement flexibility.
- Grok 4 uniquely exposes Reasoning, Function calling, and Tool use in local model data.
- Local decision data tags Grok 4 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.
Grok 3 Mini
$518
Cheapest tracked route/tier: Microsoft Foundry
Grok 4
$1,625
Cheapest tracked route/tier: xAI Console
Estimated monthly gap: $1,108. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Microsoft Foundry and OpenRouter; start route-level A/B tests there.
- Grok 4 is $1.23/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Grok 4 adds Reasoning, Function calling, and Tool use in local capability data.
- Provider overlap exists on OpenRouter and Microsoft Foundry; start route-level A/B tests there.
- Grok 3 Mini is $1.23/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning, Function calling, and Tool use before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-02-17 | 2025-07-09 |
| Context window | 131k | 256k |
| Parameters | — | — |
| Architecture | - | decoder only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use with conditions | Commercial use with conditions |
| Knowledge cutoff | 2024-11 | - |
Pricing and availability
| Pricing attribute | Grok 3 Mini | Grok 4 |
|---|---|---|
| Input price | $0.25/1M tokens | $1.25/1M tokens |
| Output price | $1.27/1M tokens | $2.50/1M tokens |
| Providers |
Capabilities
| Capability | Grok 3 Mini | Grok 4 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| 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 reasoning mode: Grok 4, function calling: Grok 4, tool use: Grok 4, and code execution: Grok 4. Both models share vision, multimodal input, 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 Mini lists $0.25/1M input and $1.27/1M output tokens on the cheapest tracked provider, while Grok 4 lists $1.25/1M input and $2.50/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Grok 3 Mini lower by about $1.07 per million blended tokens. Availability is 2 providers versus 4, so concentration risk also matters.
Choose Grok 3 Mini when vision-heavy evaluation and lower input-token cost are central to the workload. Choose Grok 4 when coding workflow support, larger context windows, 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.
FAQ
Which has a larger context window, Grok 3 Mini or Grok 4?
Grok 4 supports 256k tokens, while Grok 3 Mini supports 131k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Grok 3 Mini or Grok 4?
Grok 3 Mini is cheaper on tracked token pricing. Grok 3 Mini costs $0.25/1M input and $1.27/1M output tokens. Grok 4 costs $1.25/1M input and $2.50/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Grok 3 Mini or Grok 4 open source?
Grok 3 Mini is listed under Proprietary. Grok 4 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, Grok 3 Mini or Grok 4?
Both Grok 3 Mini and Grok 4 expose vision. 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.
Which is better for multimodal input, Grok 3 Mini or Grok 4?
Both Grok 3 Mini and Grok 4 expose multimodal input. 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 3 Mini and Grok 4?
Grok 3 Mini is available on OpenRouter and Microsoft Foundry. Grok 4 is available on Microsoft Foundry, OpenRouter, Replicate API, and xAI Console. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-06-04. Data sourced from public model cards and provider documentation.