Grok 4 Fast Reasoning vs Llama 4 Scout 17B
Grok 4 Fast Reasoning (2025) and Llama 4 Scout 17B (2025) are frontier reasoning models from xAI and AI at Meta. Grok 4 Fast Reasoning ships a not-yet-sourced context window, while Llama 4 Scout 17B ships a 10M-token context window. On pricing, Llama 4 Scout 17B costs $0.17/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Llama 4 Scout 17B is ~635% cheaper at $0.17/1M; pay for Grok 4 Fast Reasoning only for reasoning depth.
Decision scorecard
Local evidence first| Signal | Grok 4 Fast Reasoning | Llama 4 Scout 17B |
|---|---|---|
| Decision fit | General | RAG, Long context, and Vision |
| Context window | — | 10M |
| Cheapest output | $2.5/1M tokens | $0.66/1M tokens |
| Provider routes | 2 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Grok 4 Fast Reasoning has broader tracked provider coverage for fallback and procurement flexibility.
- Grok 4 Fast Reasoning uniquely exposes Reasoning in local model data.
- Llama 4 Scout 17B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Llama 4 Scout 17B has the lower cheapest tracked output price at $0.66/1M tokens.
- Llama 4 Scout 17B uniquely exposes Multimodal and Structured outputs in local model data.
- Local decision data tags Llama 4 Scout 17B for RAG, Long context, and Vision.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
Grok 4 Fast Reasoning
$1,625
Cheapest tracked route: xAI Console
Llama 4 Scout 17B
$301
Cheapest tracked route: AWS Bedrock
Estimated monthly gap: $1,324. Batch, cache, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Grok 4 Fast Reasoning and Llama 4 Scout 17B; plan for SDK, billing, or endpoint changes.
- Llama 4 Scout 17B is $1.84/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning before moving production traffic.
- Llama 4 Scout 17B adds Multimodal and Structured outputs in local capability data.
- No overlapping tracked provider route is sourced for Llama 4 Scout 17B and Grok 4 Fast Reasoning; plan for SDK, billing, or endpoint changes.
- Grok 4 Fast Reasoning is $1.84/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Multimodal and Structured outputs before moving production traffic.
- Grok 4 Fast Reasoning adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-01 | 2025-10-01 |
| Context window | — | 10M |
| Parameters | — | 17 |
| Architecture | decoder only | - |
| License | Proprietary | Open Source |
| Knowledge cutoff | - | 2024-08 |
Pricing and availability
| Pricing attribute | Grok 4 Fast Reasoning | Llama 4 Scout 17B |
|---|---|---|
| Input price | $1.25/1M tokens | $0.17/1M tokens |
| Output price | $2.5/1M tokens | $0.66/1M tokens |
| Providers |
Capabilities
| Capability | Grok 4 Fast Reasoning | Llama 4 Scout 17B |
|---|---|---|
| Vision | No | No |
| Multimodal | No | Yes |
| Reasoning | Yes | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | No | Yes |
| Code execution | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on multimodal input: Llama 4 Scout 17B, reasoning mode: Grok 4 Fast Reasoning, and structured outputs: Llama 4 Scout 17B. Both models share the core language-model surface, 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 4 Fast Reasoning lists $1.25/1M input and $2.5/1M output tokens, while Llama 4 Scout 17B lists $0.17/1M input and $0.66/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Llama 4 Scout 17B lower by about $1.31 per million blended tokens. Availability is 2 providers versus 1, so concentration risk also matters.
Choose Grok 4 Fast Reasoning when reasoning depth and broader provider choice are central to the workload. Choose Llama 4 Scout 17B when provider fit and lower input-token cost 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 is cheaper, Grok 4 Fast Reasoning or Llama 4 Scout 17B?
Llama 4 Scout 17B is cheaper on tracked token pricing. Grok 4 Fast Reasoning costs $1.25/1M input and $2.5/1M output tokens. Llama 4 Scout 17B costs $0.17/1M input and $0.66/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Grok 4 Fast Reasoning or Llama 4 Scout 17B open source?
Grok 4 Fast Reasoning is listed under Proprietary. Llama 4 Scout 17B is listed under Open Source. 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 4 Fast Reasoning or Llama 4 Scout 17B?
Llama 4 Scout 17B 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 4 Fast Reasoning or Llama 4 Scout 17B?
Grok 4 Fast Reasoning 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 structured outputs, Grok 4 Fast Reasoning or Llama 4 Scout 17B?
Llama 4 Scout 17B has the clearer documented structured outputs signal in this comparison. If structured outputs is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Grok 4 Fast Reasoning and Llama 4 Scout 17B?
Grok 4 Fast Reasoning is available on Microsoft Foundry and xAI Console. Llama 4 Scout 17B is available on AWS Bedrock. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-16. Data sourced from public model cards and provider documentation.