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Facebook AI's 2021 research chatbot with memory and web search. Now archived.
BlenderBot 2.0 was a research chatbot that Facebook AI, now Meta, released as open source on 16 July 2021. It was never a consumer app, and the ParlAI project that holds it was archived on 30 July 2026, so it is no longer maintained.
Its big step was memory and search. It saved what it learned in a conversation to a long-term memory, kept separately for each person, and it wrote its own internet search queries to find current facts. Meta said hallucinations dropped from 9.1% to 3.0% compared with BlenderBot 1. It came in two sizes, 400M and 2.7B parameters. BlenderBot 3, a 175B-parameter model, followed in the same project, and in September 2023 Meta launched Meta AI as its consumer assistant.
Bottom line: If you want a chatbot to use, pick a current assistant such as ChatGPT or Meta AI. If you are studying chatbot research, the BlenderBot 2.0 code is still readable on GitHub, but it will not get fixes.
It stored useful facts from a conversation in a long-term memory, kept separate for each person it talked with.
During a chat it generated its own search queries and worked the results into its replies.
Meta released the model, code and evaluation setup through ParlAI, in 400M and 2.7B sizes.
It came with two new datasets, Wizard of the Internet and Multi-Session Chat, plus safety training on the BAD dataset.
| Option | Price | Status today |
|---|---|---|
| BlenderBot 2.0 (ParlAI) | Free | Open source. The ParlAI repository is read-only since 30 July 2026. |
| BlenderBot 3 | Free | Part of the same archived ParlAI project. The 175B model was shared by request. |
| ChatGPT | Free, paid from $8/mo | Live. A current general AI assistant from OpenAI. |
BlenderBot was a free research release, never a paid product. ChatGPT Go is $8 a month in the US.