# Tagged router

> Announcements and real-world deployments of AI, checked against their sources and scored: open-weights releases, decision models in the wild, and what is actually in use.

- [decisionmodels releases s1-llm-auto-router, a 183 MB CPU router under MIT](https://shipped.anth.us/decisions/decisionmodels-s1-llm-auto-router/index.md): A pruned mmBERT-small that answers seven routing questions in one CPU pass. The card reports 0.898 category accuracy on its held-out set. (2026-10-15)
- [Microsoft releases Decision-1, a 9B model that scores fixed answer options](https://shipped.anth.us/decisions/microsoft-decision-1/index.md): Microsoft-Decision-1 returns a probability per answer option instead of prose. Hosted on Foundry and OpenRouter; no licence stated. (2026-10-09)
- [Amazon publishes Strands Decider 2B, a small decision model for agent workflows](https://shipped.anth.us/decisions/amazon-strands-decider-2b/index.md): A 2B LoRA on Qwen3.5-2B-Base, Apache-2.0, with a /v1/systemone server. The card reports 0.779 on 231 public JevBench tasks. (2026-10-09)
- [OpenAI opens its Decisions API in public beta, built on GPT-6 Luna](https://shipped.anth.us/decisions/openai-decisions-api/index.md): A /v1/decisions endpoint returns typed predicate, choice and score answers. Public beta, $0.10 per million input tokens, GA promised in weeks. (2026-10-06)
- [Perplexity releases pplx-decider, an Apache-2.0 27B decision model](https://shipped.anth.us/decisions/perplexity-pplx-decider/index.md): pplx-decider-v1 and v1.1 are open-weight 27B models that return probabilities for fixed answers. Built on Qwen3.8-27B. (2026-10-01)
- [vLLM Semantic Router team releases Decision 2.0 open decision models](https://shipped.anth.us/decisions/vllm-decision-2-0/index.md): Decision 2.0 is an Apache-2.0 family from vllm-sr. The 27B Vega card reports 74.0 on JevArena. Lux is a 9B sibling. (2026-09-29)
- [TypeSafe AI launches Jev, a hosted model for typed software decisions](https://shipped.anth.us/decisions/typesafe-jev/index.md): Jev takes state and typed questions and returns probabilities. Early access via API, $0.042 per million input tokens; weights not stated. (2026-09-15)
- [Katanemo releases Arch-Router 1.5B, a router that follows your own route descriptions](https://shipped.anth.us/decisions/katanemo-arch-router-1-5b/index.md): For context: a Qwen2.5-1.5B-based model that maps a query to a user-defined route and returns JSON. Released under the Katanemo licence. (2025-06-19)