Grok 4 Fast Reasoning vs RWKV-7 Goose 1.5B
Grok 4 Fast Reasoning (2025) and RWKV-7 Goose 1.5B (2025) are frontier reasoning models from xAI and RWKV Project. Grok 4 Fast Reasoning ships a 2m-token context window, while RWKV-7 Goose 1.5B ships a Infinite-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.
Grok 4 Fast Reasoning is safer overall; choose RWKV-7 Goose 1.5B when provider fit matters.
Decision scorecard
Local evidence first| Signal | Grok 4 Fast Reasoning | RWKV-7 Goose 1.5B |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and long-context analysis | general production evaluation |
| Decision fit | Long context and Vision | Long context |
| Context window | 2m | Infinite |
| Cheapest output | $2.50/1M tokens | - |
| Provider routes | 2 tracked | 0 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 Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Grok 4 Fast Reasoning for Long context and Vision.
- RWKV-7 Goose 1.5B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Local decision data tags RWKV-7 Goose 1.5B for Long context.
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
RWKV-7 Goose 1.5B
Unavailable
No complete token price in local provider data
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 RWKV-7 Goose 1.5B; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
- No overlapping tracked provider route is sourced for RWKV-7 Goose 1.5B and Grok 4 Fast Reasoning; plan for SDK, billing, or endpoint changes.
- Grok 4 Fast Reasoning adds Vision, Multimodal, and Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-01 | 2025-03-18 |
| Context window | 2m | Infinite |
| Parameters | — | 1.5B |
| Architecture | decoder only | decoder only |
| License | Proprietary | Apache 2.0 |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Grok 4 Fast Reasoning | RWKV-7 Goose 1.5B |
|---|---|---|
| Input price | $1.25/1M tokens | - |
| Output price | $2.50/1M tokens | - |
| Providers | - |
Capabilities
| Capability | Grok 4 Fast Reasoning | RWKV-7 Goose 1.5B |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | No | No |
| 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 vision: Grok 4 Fast Reasoning, multimodal input: Grok 4 Fast Reasoning, and reasoning mode: Grok 4 Fast Reasoning. 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.
Pricing coverage is uneven: Grok 4 Fast Reasoning has $1.25/1M input tokens and RWKV-7 Goose 1.5B has no token price sourced yet. Provider availability is 2 tracked routes versus 0. 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 reasoning depth and broader provider choice are central to the workload. Choose RWKV-7 Goose 1.5B when provider fit 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
Is Grok 4 Fast Reasoning or RWKV-7 Goose 1.5B open source?
Grok 4 Fast Reasoning is listed under Proprietary. RWKV-7 Goose 1.5B 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 RWKV-7 Goose 1.5B?
Grok 4 Fast Reasoning 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.
Which is better for multimodal input, Grok 4 Fast Reasoning or RWKV-7 Goose 1.5B?
Grok 4 Fast Reasoning 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 RWKV-7 Goose 1.5B?
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.
Where can I run Grok 4 Fast Reasoning and RWKV-7 Goose 1.5B?
Grok 4 Fast Reasoning is available on Microsoft Foundry and xAI Console. RWKV-7 Goose 1.5B is available on the tracked providers still being sourced. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
When should I pick Grok 4 Fast Reasoning over RWKV-7 Goose 1.5B?
Grok 4 Fast Reasoning is safer overall; choose RWKV-7 Goose 1.5B when provider fit matters. If your workload also depends on reasoning depth, start with Grok 4 Fast Reasoning; if it depends on provider fit, run the same evaluation with RWKV-7 Goose 1.5B.
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Last reviewed: 2026-05-25. Data sourced from public model cards and provider documentation.