Llama Prompt Guard 2 22M vs Qwen3.5-4B
Llama Prompt Guard 2 22M (2025) and Qwen3.5-4B (2026) are compact production models from AI at Meta and Alibaba. Llama Prompt Guard 2 22M ships a 512-token context window, while Qwen3.5-4B 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.
Qwen3.5-4B fits 512x more tokens; pick it for long-context work and Llama Prompt Guard 2 22M for tighter calls.
Decision scorecard
Local evidence first| Signal | Llama Prompt Guard 2 22M | Qwen3.5-4B |
|---|---|---|
| Decision fit | Classification and JSON / Tool use | Long context and Vision |
| Context window | 512 | 262K |
| Cheapest output | $0.03/1M tokens | - |
| Provider routes | 1 tracked | 0 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Llama Prompt Guard 2 22M has broader tracked provider coverage for fallback and procurement flexibility.
- Llama Prompt Guard 2 22M uniquely exposes Structured outputs in local model data.
- Local decision data tags Llama Prompt Guard 2 22M for Classification and JSON / Tool use.
- Qwen3.5-4B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Qwen3.5-4B uniquely exposes Vision and Multimodal in local model data.
- Local decision data tags Qwen3.5-4B for Long context and Vision.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
Llama Prompt Guard 2 22M
$31.50
Cheapest tracked route: GroqCloud
Qwen3.5-4B
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 Llama Prompt Guard 2 22M and Qwen3.5-4B; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Structured outputs before moving production traffic.
- Qwen3.5-4B adds Vision and Multimodal in local capability data.
- No overlapping tracked provider route is sourced for Qwen3.5-4B and Llama Prompt Guard 2 22M; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision and Multimodal before moving production traffic.
- Llama Prompt Guard 2 22M adds Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-04-29 | 2026-03-02 |
| Context window | 512 | 262K |
| Parameters | 22M | 4B |
| Architecture | decoder only | - |
| License | Llama 3.1 Community | Apache 2.0 |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Llama Prompt Guard 2 22M | Qwen3.5-4B |
|---|---|---|
| Input price | $0.03/1M tokens | - |
| Output price | $0.03/1M tokens | - |
| Providers | - |
Capabilities
| Capability | Llama Prompt Guard 2 22M | Qwen3.5-4B |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | Yes | 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: Qwen3.5-4B, multimodal input: Qwen3.5-4B, and structured outputs: Llama Prompt Guard 2 22M. 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: Llama Prompt Guard 2 22M has $0.03/1M input tokens and Qwen3.5-4B has no token price sourced yet. Provider availability is 1 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Llama Prompt Guard 2 22M when provider fit and broader provider choice are central to the workload. Choose Qwen3.5-4B when long-context analysis and larger context windows 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
Which has a larger context window, Llama Prompt Guard 2 22M or Qwen3.5-4B?
Qwen3.5-4B supports 262K tokens, while Llama Prompt Guard 2 22M supports 512 tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is Llama Prompt Guard 2 22M or Qwen3.5-4B open source?
Llama Prompt Guard 2 22M is listed under Llama 3.1 Community. Qwen3.5-4B 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, Llama Prompt Guard 2 22M or Qwen3.5-4B?
Qwen3.5-4B 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, Llama Prompt Guard 2 22M or Qwen3.5-4B?
Qwen3.5-4B 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 structured outputs, Llama Prompt Guard 2 22M or Qwen3.5-4B?
Llama Prompt Guard 2 22M 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 Llama Prompt Guard 2 22M and Qwen3.5-4B?
Llama Prompt Guard 2 22M is available on GroqCloud. Qwen3.5-4B is available on the tracked providers still being sourced. 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.