{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:EPJYVJIVMAIU3JNVL4TM5SGABF","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"e6de3ca33fcc4402d3ae1f27f0eba99143a99c84797c5ba343240039defabf5a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.AI","submitted_at":"2026-06-11T11:54:07Z","title_canon_sha256":"56580c3fed6f73c772e028af6726c434d0b63dfbc49579d17c0f1fe2fee09ad5"},"schema_version":"1.0","source":{"id":"2606.13241","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.13241","created_at":"2026-06-12T01:09:48Z"},{"alias_kind":"arxiv_version","alias_value":"2606.13241v1","created_at":"2026-06-12T01:09:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.13241","created_at":"2026-06-12T01:09:48Z"},{"alias_kind":"pith_short_12","alias_value":"EPJYVJIVMAIU","created_at":"2026-06-12T01:09:48Z"},{"alias_kind":"pith_short_16","alias_value":"EPJYVJIVMAIU3JNV","created_at":"2026-06-12T01:09:48Z"},{"alias_kind":"pith_short_8","alias_value":"EPJYVJIV","created_at":"2026-06-12T01:09:48Z"}],"graph_snapshots":[{"event_id":"sha256:99440a4386717fb1d1cab3595ab5c19982a887987b99a511f276d3db3f45cf16","target":"graph","created_at":"2026-06-12T01:09:48Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2606.13241/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Defining query difficulty is one of the hardest problems in deployment engineering. Existing LLM routers rely on surface features such as domain labels, keywords, and token count, ignoring the within-domain variance that actually determines model success. Frontier models cost ten to one hundred times more than local open-weight models, so at production scale even small per-request savings become a direct cloud-bill lever. We present Brick, a multimodal router that scores each model on six capability dimensions, combines this with a per-query difficulty estimate, and dispatches via a cost-penal","authors_text":"Francesco Massa, Marco Cristofanilli","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.AI","submitted_at":"2026-06-11T11:54:07Z","title":"Brick: Spatial Capability Routing for the Mixture-of-Models (MoM) Paradigm"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.13241","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:2d939d0ebad31d6c91dcfd8c277865a9783e39a67ae2e1549b60aec845447c6d","target":"record","created_at":"2026-06-12T01:09:48Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"e6de3ca33fcc4402d3ae1f27f0eba99143a99c84797c5ba343240039defabf5a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.AI","submitted_at":"2026-06-11T11:54:07Z","title_canon_sha256":"56580c3fed6f73c772e028af6726c434d0b63dfbc49579d17c0f1fe2fee09ad5"},"schema_version":"1.0","source":{"id":"2606.13241","kind":"arxiv","version":1}},"canonical_sha256":"23d38aa51560114da5b55f26cec8c00940ec6a999b24616743248ec8d4243706","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"23d38aa51560114da5b55f26cec8c00940ec6a999b24616743248ec8d4243706","first_computed_at":"2026-06-12T01:09:48.573713Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-12T01:09:48.573713Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LM/cV4EdFYi8RvDeH1CCTYze48sb9zG5msVRwEnCqKYjnNwJQlZkTJJSQtQPr/zN5C3AHKhWytGFMz7EtEDTCQ==","signature_status":"signed_v1","signed_at":"2026-06-12T01:09:48.574591Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.13241","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2d939d0ebad31d6c91dcfd8c277865a9783e39a67ae2e1549b60aec845447c6d","sha256:99440a4386717fb1d1cab3595ab5c19982a887987b99a511f276d3db3f45cf16"],"state_sha256":"444f67ebd10edead6ccd50e69be0cbb7f922e125ea470bcac41467e4bfaa70b4"}