{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:FTUXQJU6ZMD34PZFVQTFUKRESM","short_pith_number":"pith:FTUXQJU6","canonical_record":{"source":{"id":"2606.06203","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-04T14:08:30Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"5b0a40fe39cf9726e1f0fab7d8d0b1101bc4ca058cdc1c3686f5beefbf729487","abstract_canon_sha256":"4a118e2fa2571870b3d65660db17b4aca89fb746ca2aa0ec0baa0d1484da34e5"},"schema_version":"1.0"},"canonical_sha256":"2ce978269ecb07be3f25ac265a2a24931789a0d2df7317aeb037e9ae7234cc57","source":{"kind":"arxiv","id":"2606.06203","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.06203","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"arxiv_version","alias_value":"2606.06203v1","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.06203","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"pith_short_12","alias_value":"FTUXQJU6ZMD3","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"pith_short_16","alias_value":"FTUXQJU6ZMD34PZF","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"pith_short_8","alias_value":"FTUXQJU6","created_at":"2026-06-05T01:15:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:FTUXQJU6ZMD34PZFVQTFUKRESM","target":"record","payload":{"canonical_record":{"source":{"id":"2606.06203","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-04T14:08:30Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"5b0a40fe39cf9726e1f0fab7d8d0b1101bc4ca058cdc1c3686f5beefbf729487","abstract_canon_sha256":"4a118e2fa2571870b3d65660db17b4aca89fb746ca2aa0ec0baa0d1484da34e5"},"schema_version":"1.0"},"canonical_sha256":"2ce978269ecb07be3f25ac265a2a24931789a0d2df7317aeb037e9ae7234cc57","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-05T01:15:37.197820Z","signature_b64":"xtt/B6IGNvUGQN/Y8pJF9x5INyI+fj/fzXlubIHsHut5LQVE3Q8V2cnvzQ8FE6kFCmUKGwuHyZ0lnR3mjW2hDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2ce978269ecb07be3f25ac265a2a24931789a0d2df7317aeb037e9ae7234cc57","last_reissued_at":"2026-06-05T01:15:37.197231Z","signature_status":"signed_v1","first_computed_at":"2026-06-05T01:15:37.197231Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.06203","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-05T01:15:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qgh1dN9uwOWvOHdgrsi4hrK5Qzs+qiAe5G70ShIKEXbBpOE7mrq35Tj6tTOG1fgf4rmDmbJBfy6M9jV8bquuCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T16:35:35.223675Z"},"content_sha256":"ea5f7021687f20d7d3550cf746e4158283d76436a2f2d89fee112f9930dbbbc8","schema_version":"1.0","event_id":"sha256:ea5f7021687f20d7d3550cf746e4158283d76436a2f2d89fee112f9930dbbbc8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:FTUXQJU6ZMD34PZFVQTFUKRESM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dense Contexts Are Hard Contexts: Lexical Density Limits Effective Context in LLMs","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.CL","authors_text":"Danilo Giordano, Giovanni Dettori, Idilio Drago, Marco Mellia, Matteo Boffa","submitted_at":"2026-06-04T14:08:30Z","abstract_excerpt":"Input length and the position of relevant information are widely cited as the primary causes of degraded LLM long-context performance. Here, we study lexical density -- the rate at which a context introduces distinct information -- as a third, largely overlooked factor that systematically reduces the effective context window of LLMs. We quantify the impact of lexical density on open-weight LLMs (9B-685B) using three \"find-the-needle\" style benchmarks with identical length (~12k tokens) and controlled needle position, but increasing density of information. We observe a sharp performance collaps"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.06203","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.06203/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-05T01:15:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SDeibchUGMhFaZqUCbrLNZjbixxsum0bvnT0Y/21Q3gvor3xMhPe9/dIeMe2p0hUvQfX7VCTG1XdFYAUnEOADw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T16:35:35.224075Z"},"content_sha256":"9d09b5784108c5295778a2be3ed7683c97a9bc77cf759eab4af153f1a52e21c1","schema_version":"1.0","event_id":"sha256:9d09b5784108c5295778a2be3ed7683c97a9bc77cf759eab4af153f1a52e21c1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FTUXQJU6ZMD34PZFVQTFUKRESM/bundle.json","state_url":"https://pith.science/pith/FTUXQJU6ZMD34PZFVQTFUKRESM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FTUXQJU6ZMD34PZFVQTFUKRESM/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-09T16:35:35Z","links":{"resolver":"https://pith.science/pith/FTUXQJU6ZMD34PZFVQTFUKRESM","bundle":"https://pith.science/pith/FTUXQJU6ZMD34PZFVQTFUKRESM/bundle.json","state":"https://pith.science/pith/FTUXQJU6ZMD34PZFVQTFUKRESM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FTUXQJU6ZMD34PZFVQTFUKRESM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:FTUXQJU6ZMD34PZFVQTFUKRESM","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":"4a118e2fa2571870b3d65660db17b4aca89fb746ca2aa0ec0baa0d1484da34e5","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-04T14:08:30Z","title_canon_sha256":"5b0a40fe39cf9726e1f0fab7d8d0b1101bc4ca058cdc1c3686f5beefbf729487"},"schema_version":"1.0","source":{"id":"2606.06203","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.06203","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"arxiv_version","alias_value":"2606.06203v1","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.06203","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"pith_short_12","alias_value":"FTUXQJU6ZMD3","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"pith_short_16","alias_value":"FTUXQJU6ZMD34PZF","created_at":"2026-06-05T01:15:37Z"},{"alias_kind":"pith_short_8","alias_value":"FTUXQJU6","created_at":"2026-06-05T01:15:37Z"}],"graph_snapshots":[{"event_id":"sha256:9d09b5784108c5295778a2be3ed7683c97a9bc77cf759eab4af153f1a52e21c1","target":"graph","created_at":"2026-06-05T01:15:37Z","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/2606.06203/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Input length and the position of relevant information are widely cited as the primary causes of degraded LLM long-context performance. Here, we study lexical density -- the rate at which a context introduces distinct information -- as a third, largely overlooked factor that systematically reduces the effective context window of LLMs. We quantify the impact of lexical density on open-weight LLMs (9B-685B) using three \"find-the-needle\" style benchmarks with identical length (~12k tokens) and controlled needle position, but increasing density of information. We observe a sharp performance collaps","authors_text":"Danilo Giordano, Giovanni Dettori, Idilio Drago, Marco Mellia, Matteo Boffa","cross_cats":["cs.AI"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-04T14:08:30Z","title":"Dense Contexts Are Hard Contexts: Lexical Density Limits Effective Context in LLMs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.06203","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:ea5f7021687f20d7d3550cf746e4158283d76436a2f2d89fee112f9930dbbbc8","target":"record","created_at":"2026-06-05T01:15:37Z","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":"4a118e2fa2571870b3d65660db17b4aca89fb746ca2aa0ec0baa0d1484da34e5","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-04T14:08:30Z","title_canon_sha256":"5b0a40fe39cf9726e1f0fab7d8d0b1101bc4ca058cdc1c3686f5beefbf729487"},"schema_version":"1.0","source":{"id":"2606.06203","kind":"arxiv","version":1}},"canonical_sha256":"2ce978269ecb07be3f25ac265a2a24931789a0d2df7317aeb037e9ae7234cc57","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2ce978269ecb07be3f25ac265a2a24931789a0d2df7317aeb037e9ae7234cc57","first_computed_at":"2026-06-05T01:15:37.197231Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-05T01:15:37.197231Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xtt/B6IGNvUGQN/Y8pJF9x5INyI+fj/fzXlubIHsHut5LQVE3Q8V2cnvzQ8FE6kFCmUKGwuHyZ0lnR3mjW2hDA==","signature_status":"signed_v1","signed_at":"2026-06-05T01:15:37.197820Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.06203","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ea5f7021687f20d7d3550cf746e4158283d76436a2f2d89fee112f9930dbbbc8","sha256:9d09b5784108c5295778a2be3ed7683c97a9bc77cf759eab4af153f1a52e21c1"],"state_sha256":"a10dff0da77577128c9ce0498aaecbedf0894eddc8ea7801b0d8251a07f53167"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JAmRKLguqZOshpBjLSj1iMz1wKHBf4h+Qmo061/SR8qw8+9b9IOp3Oj4nn6f0Dz9TDIPOtdnDeQMCMH6uvCkAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T16:35:35.226206Z","bundle_sha256":"2f03d3729caa34723428911fde4f95cce49d05d8332f94f35419173fcba26450"}}