Grok 4 Fast Reasoning vs Qwen3.6 Max Preview
Grok 4 Fast Reasoning (2025) and Qwen3.6 Max Preview (2026) are frontier-tier reasoning models from xAI and Alibaba. Grok 4 Fast Reasoning ships a 2m-token context window, while Qwen3.6 Max Preview ships a 256k-token context window. On pricing, Grok 4 Fast Reasoning costs $1.25/1M input tokens; Qwen3.6 Max Preview ranges from $1.30 to $2/1M input tokens by tier. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Grok 4 Fast Reasoning fits 8x more tokens; pick it for long-context work and Qwen3.6 Max Preview for tighter calls.
Decision scorecard
Local evidence first| Signal | Grok 4 Fast Reasoning | Qwen3.6 Max Preview |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and long-context analysis | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Long context and Vision | Coding, RAG, and Agents |
| Context window | 2m | 256k |
| Cheapest output | $2.50/1M tokens | $6.24/1M tokens |
| Provider routes | 2 tracked | 3 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Grok 4 Fast Reasoning has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Grok 4 Fast Reasoning has the lower cheapest tracked output price at $2.50/1M tokens.
- Local decision data tags Grok 4 Fast Reasoning for Long context and Vision.
- Qwen3.6 Max Preview has broader tracked provider coverage for fallback and procurement flexibility.
- Qwen3.6 Max Preview uniquely exposes Function calling, Tool use, and Structured outputs in local model data.
- Local decision data tags Qwen3.6 Max Preview 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 4 Fast Reasoning
$1,625
Cheapest tracked route/tier: xAI Console
Qwen3.6 Max Preview
$2,392
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $767. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Grok 4 Fast Reasoning and Qwen3.6 Max Preview; plan for SDK, billing, or endpoint changes.
- Qwen3.6 Max Preview is $3.74/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Qwen3.6 Max Preview adds Function calling, Tool use, and Structured outputs in local capability data.
- No overlapping tracked provider route is sourced for Qwen3.6 Max Preview and Grok 4 Fast Reasoning; plan for SDK, billing, or endpoint changes.
- Grok 4 Fast Reasoning is $3.74/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Function calling, Tool use, and Structured outputs before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-01 | 2026-04-20 |
| Context window | 2m | 256k |
| Parameters | — | — |
| Architecture | decoder only | moe |
| License | Proprietary | Apache 2.0(OSI) |
| Openness | Proprietary | Open source |
| Commercial use | Commercial use with conditions | Commercial use allowed |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Grok 4 Fast Reasoning | Qwen3.6 Max Preview |
|---|---|---|
| Input price | $1.25/1M tokens |
|
| Output price | $2.50/1M tokens |
|
| Providers |
Capabilities
| Capability | Grok 4 Fast Reasoning | Qwen3.6 Max Preview |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | No |
| 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 function calling: Qwen3.6 Max Preview, tool use: Qwen3.6 Max Preview, and structured outputs: Qwen3.6 Max Preview. Both models share vision, multimodal input, and 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.
For cost, Grok 4 Fast Reasoning lists $1.25/1M input and $2.50/1M output tokens on the cheapest tracked provider, while Qwen3.6 Max Preview lists tiered pricing: 0-128,000t is $1.30/1M input and $7.80/1M output; 128,000t+ is $2/1M input and $12/1M output. A 70/30 input-output blend puts Grok 4 Fast Reasoning lower by about $0.97 per million blended tokens. For tiered rows, this cheapest-track view can understate interactive or fast-lane spend, so compare the tier you will actually use. Availability is 2 providers versus 3, so concentration risk also matters.
Choose Grok 4 Fast Reasoning when long-context analysis and larger context windows are central to the workload. Choose Qwen3.6 Max Preview when vision-heavy evaluation, lower cheapest-tier input-token cost, 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.
FAQ
Which has a larger context window, Grok 4 Fast Reasoning or Qwen3.6 Max Preview?
Grok 4 Fast Reasoning supports 2m tokens, while Qwen3.6 Max Preview supports 256k 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 4 Fast Reasoning or Qwen3.6 Max Preview?
Grok 4 Fast Reasoning lists $1.25/1M input and $2.50/1M output tokens on the cheapest tracked provider. Qwen3.6 Max Preview lists tiered pricing: 0-128,000t is $1.30/1M input and $7.80/1M output; 128,000t+ is $2/1M input and $12/1M output. Compare the tier you will actually use; cheap async pricing can overstate savings for interactive workflows. Provider discounts or batch pricing can still change the final bill.
Is Grok 4 Fast Reasoning or Qwen3.6 Max Preview open source?
Grok 4 Fast Reasoning is listed under Proprietary. Qwen3.6 Max Preview 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 Max Preview?
Both Grok 4 Fast Reasoning and Qwen3.6 Max Preview expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Grok 4 Fast Reasoning or Qwen3.6 Max Preview?
Both Grok 4 Fast Reasoning and Qwen3.6 Max Preview 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 4 Fast Reasoning and Qwen3.6 Max Preview?
Grok 4 Fast Reasoning is available on Microsoft Foundry and xAI Console. Qwen3.6 Max Preview is available on OpenRouter, Alibaba Cloud PAI-EAS, and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.