{"uid":"cap_6owvb0p0oi5wnbdp40Kzp","slug":"stack-facts-llm-model-catalog-changes-feed-6f64d9ea","name":"Stack Facts: LLM Model Catalog Changes Feed","description":"Check a package before install: malware, known vulnerabilities (OSV), exploited CVEs (CISA KEV) and end-of-life, plus LLM prices; signed answers, pay per call in USDC, no account or API key.","url":"https://g5joilnmeep4ntz3nwezxt5dmu.srv.us/v1/models/changes?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$defs":{"meta":{"type":"object","required":["dataset","snapshot_id","as_of","retrieved_at","source","licence","attribution","sha256","signature","key_id","manifest_url","stale","notice"],"properties":{"as_of":{"type":"string"},"stale":{"type":"boolean"},"key_id":{"type":"string"},"notice":{"type":"string"},"sha256":{"type":"string"},"source":{"type":"string"},"dataset":{"type":"string"},"licence":{"type":"string"},"signature":{"type":"string"},"attribution":{"type":"string"},"snapshot_id":{"type":"string"},"manifest_url":{"type":"string"},"retrieved_at":{"type":"string"}}}},"$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"type":"string","const":"GET"},"queryParams":{"type":"object","required":["since"],"properties":{"since":{"type":"string","pattern":"^models-\\d{8}T\\d{6}Z-[0-9a-f]{8}$","maxLength":64}},"additionalProperties":false}}},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["data","meta"],"properties":{"data":{"type":"object"},"meta":{"$ref":"#/$defs/meta"}}}}}}},"responseSchema":{"type":"json","example":{"data":{"to":"models-20261009T060000Z-f99d55c9","added":[],"since":"models-20261009T050000Z-044bcb8b","counts":{"added":1,"removed":1,"modified":2},"removed":["perplexity/sonar"],"modified":[{"id":"openai/gpt-4o-mini","mode":"chat","name":"GPT-4o mini","model":"gpt-4o-mini","status":null,"vision":true,"aliases":[],"sources":{},"provider":"openai","reasoning":false,"tool_call":true,"deprecated":true,"release_date":"2024-07-18","context_tokens":128000,"deprecation_date":"2026-10-01","input_modalities":["text"],"knowledge_cutoff":"2023-09","sources_disagree":[],"max_output_tokens":16384,"output_modalities":["text"],"input_usd_per_mtok":0.15,"output_usd_per_mtok":0.6,"days_until_deprecation":-8,"cache_read_usd_per_mtok":0.075,"cache_write_usd_per_mtok":null}],"snapshots_merged":1},"meta":{"as_of":"2026-10-09T06:00:00Z","stale":false,"key_id":"sf-test-1","notice":"Normalised (modified) from the …","sha256":"f99d55c9aa420561de698d63d70d916…","source":"https://raw.githubusercontent.c…","dataset":"models","licence":"MIT","signature":"AvlI5FXM8fD9oncZAr9velQseOBO9X7…","attribution":"Pricing data derived from LiteL…","snapshot_id":"models-20261009T060000Z-f99d55c9","manifest_url":"/v1/models/manifest","retrieved_at":"2026-10-09T06:00:00.000Z"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_0yAZ5e9xq9BPw5jaJi1vJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a diff of LLM model changes (additions, removals, modifications including pricing and capabilities) between two named snapshots of the model catalog.","exampleAgentPrompt":"What changed in the LLM model catalog since snapshot models-20261009T050000Z-044bcb8b? Show me any models added, removed, or modified including pricing updates.","exampleUseCases":[{"title":"Detecting newly deprecated AI models","prompt":"Have any LLM models been deprecated or removed since snapshot models-20261009T050000Z-044bcb8b? I want to know if anything I'm currently using got deprecated."},{"title":"Tracking LLM pricing changes for cost management","prompt":"What pricing changes happened to AI models since snapshot models-20261009T050000Z-044bcb8b? I need to know if input or output costs shifted for any major providers."},{"title":"Alerting pipeline on new model releases","prompt":"Check the LLM model catalog changes since models-20261009T050000Z-044bcb8b and tell me if any new models were added, especially from OpenAI or Anthropic."}],"resultDescription":"A signed JSON payload containing: the 'since' and 'to' snapshot IDs, lists of added and removed model IDs, full modified model objects (with fields like input_usd_per_mtok, output_usd_per_mtok, context_tokens, deprecation_date, tool_call, vision, reasoning, etc.), counts of changes, and a metadata block with timestamp, dataset, licence, SHA-256 hash, and cryptographic signature for integrity verification.","failureModes":["Invalid or malformed 'since' snapshot ID returns an error — must match pattern ^models-\\d{8}T\\d{6}Z-[0-9a-f]{8}$","Snapshot ID references a snapshot older than the available history window — no data returned","Payment not received or insufficient USDC balance — 402 response blocking access","Stale data flag set to true in meta if the underlying dataset hasn't refreshed recently","Network timeout if the upstream model data sources are unavailable"],"whenToPreferThis":"Choose this endpoint when you need a precise, signed diff of LLM model catalog changes between two known snapshots — particularly for automated pipelines that track model deprecations, pricing shifts, new releases, or capability updates. 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