Grok 4 Fast Reasoning vs Qwen3.6-27B
Grok 4 Fast Reasoning (2025) and Qwen3.6-27B (2026) are agentic coding models from xAI and Alibaba. Grok 4 Fast Reasoning ships a not-yet-sourced context window, while Qwen3.6-27B ships a 262K-token context window. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing. The goal is to make the tradeoff clear before deeper testing.
Qwen3.6-27B is safer overall; choose Grok 4 Fast Reasoning when provider fit matters.
Decision scorecard
Local evidence first| Signal | Grok 4 Fast Reasoning | Qwen3.6-27B |
|---|---|---|
| Decision fit | General | Coding, RAG, and Agents |
| Context window | — | 262K |
| Cheapest output | - | $3.2/1M tokens |
| Provider routes | 1 tracked | 2 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Use Grok 4 Fast Reasoning when your own prompt tests beat the comparison signals; the local data does not show a decisive standalone advantage yet.
- Qwen3.6-27B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Qwen3.6-27B has broader tracked provider coverage for fallback and procurement flexibility.
- Qwen3.6-27B uniquely exposes Vision, Multimodal, and Function calling in local model data.
- Local decision data tags Qwen3.6-27B for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
Grok 4 Fast Reasoning
Unavailable
No complete token price in local provider data
Qwen3.6-27B
$1,056
Cheapest tracked route: OpenRouter
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Grok 4 Fast Reasoning and Qwen3.6-27B; plan for SDK, billing, or endpoint changes.
- Qwen3.6-27B adds Vision, Multimodal, and Function calling in local capability data.
- No overlapping tracked provider route is sourced for Qwen3.6-27B and Grok 4 Fast Reasoning; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Multimodal, and Function calling before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-01 | 2026-04-27 |
| Context window | — | 262K |
| Parameters | — | 27B |
| Architecture | decoder only | dense |
| License | Proprietary | Apache 2.0 |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Grok 4 Fast Reasoning | Qwen3.6-27B |
|---|---|---|
| Input price | - | $0.32/1M tokens |
| Output price | - | $3.2/1M tokens |
| Providers |
Capabilities
| Capability | Grok 4 Fast Reasoning | Qwen3.6-27B |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | Yes | Yes |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | No | No |
| Code execution | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: Qwen3.6-27B, multimodal input: Qwen3.6-27B, function calling: Qwen3.6-27B, and tool use: Qwen3.6-27B. Both models share reasoning mode, 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.
Pricing coverage is uneven: Grok 4 Fast Reasoning has no token price sourced yet and Qwen3.6-27B has $0.32/1M input tokens. Provider availability is 1 tracked routes versus 2. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Grok 4 Fast Reasoning when provider fit are central to the workload. Choose Qwen3.6-27B 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. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Is Grok 4 Fast Reasoning or Qwen3.6-27B open source?
Grok 4 Fast Reasoning is listed under Proprietary. Qwen3.6-27B is listed under Apache 2.0. 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 4 Fast Reasoning or Qwen3.6-27B?
Qwen3.6-27B 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 4 Fast Reasoning or Qwen3.6-27B?
Qwen3.6-27B 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 Qwen3.6-27B?
Both Grok 4 Fast Reasoning and Qwen3.6-27B expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for function calling, Grok 4 Fast Reasoning or Qwen3.6-27B?
Qwen3.6-27B 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 4 Fast Reasoning and Qwen3.6-27B?
Grok 4 Fast Reasoning is available on Microsoft Foundry. Qwen3.6-27B is available on OpenRouter and Alibaba Cloud PAI-EAS. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-14. Data sourced from public model cards and provider documentation.