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DocsAbout the data Aboutness API and Data Snapshot Author disambiguation Can I search exact terms?Can I search patents in OpenAlex?Changelog Data ingest pipeline Do you index DataCite DOIs?Does OpenAlex index books?Field Weighted Citation Impact (FWCI)French affiliation structures are complex-- how does OpenAlex handle them?How accurate is OpenAlex?How are documents located from repository records?How are repository records matched to published articles?How can I see if OpenAlex has the same papers as other databases?How do I make the Unpaywall extension work on my site?How do I read JSONL files?How do I use the title search API?How do we decide if a given journal is fully OA?How do you assign papers to specific countries?How do you classify works as contributing to the UN SDGs?How do you determine work type?How does OpenAlex handle predatory and "lower-quality" journals?How does OpenAlex work?How is OpenAlex "open?"How is the best OA location determined?How sustainable is OpenAlex?Institutions and Raw Affiliation String Parsing Is OpenAlex data used in University rankings?Keywords Link Resolver Integrations Open Access (OA)Paper version definitions Preventing Code Injection - Using Text From Unpaywall Safely Recommendation for IRs: License reporting Recommendation for IRs: Version reporting Should I use Subfields or Concepts for my search?Sources in OpenAlex The reference counts in OpenAlex seem off. Why is that?Topics Unpaywall Change Notes What are CWTS Core sources and how are they different from Web of Science Core Collection?What content does OpenAlex include and how does it compare to other databases?What counts as an Open Access location?What do the fields in the API response and snapshot records mean?What do the host_type values "publisher" and "repository" mean?What does is_paratext mean in the API?What does oa_date mean and how is it determined?What is an OA license?What is the difference between topics and topic_share in OpenAlex entities?When I look at my repository as a Source in OpenAlex, why is it missing most of our works?Where do works in OpenAlex come from?Where do you get APC paid metadata from?Where does your citation information come from?Which DOIs does Unpaywall cover?Why are some authors assigned to "NULL AUTHOR_ID" (A9999999999)?Why are the counts_by_year numbers different than the count of works in a year?Why does the Unpaywall plugin say this paywalled article is Open Access?Why is affiliation history metadata incomplete?

Changelog

Recent updates and changes to the OpenAlex API.

2026

February 13, 2026

API keys required — All API requests now require an API key. You can get your free key at openalex.org/settings/api.

February 4, 2026

API keys recommended — API keys are now recommended for all requests. Starting February 13, they become required.

For older updates and announcements, see the OpenAlex User Group.

OpenAlex — the open catalog of the global research systemopenalex.org Contact support llms.txt