AI Eval & Observability — Timeline
25 milestones, source-traced.
Oct 8, 2024
Funding: Braintrust Data closed a $36 million Series A led by Martin Casado of Andreessen...
Braintrust Data closed a $36 million Series A led by Martin Casado of Andreessen Horowitz at a $150 million valuation.
funding-research →Oct 8, 2024
Funding: Braintrust raised a $36 million Series A led by Andreessen Horowitz (Martin Casado) at...
Braintrust raised a $36 million Series A led by Andreessen Horowitz (Martin Casado) at a $150 million post-money valuation.
funding-research →Nov 1, 2024
Product Launch: Langfuse held Launch Week 2, closing its end-to-end development loop.
funding-research →Dec 1, 2024
Product Launch: In December 2024, Langfuse released v3, migrating its infrastructure from PostgreSQL to ClickHouse to...
In December 2024, Langfuse released v3, migrating its infrastructure from PostgreSQL to ClickHouse to handle hundreds of millions of records.
funding-research →Dec 1, 2024
Product Launch: Langfuse switched its backend to ClickHouse with its v3 release for scalability.
funding-research →Jan 1, 2025
Partnership: Arize AI announced a strengthened partnership with Microsoft, leveraging M12's investment to enhance integrations...
Arize AI announced a strengthened partnership with Microsoft, leveraging M12's investment to enhance integrations with Azure AI.
funding-research →Feb 1, 2025
Partnership: Arize AI announced a strategic partnership expansion with Microsoft in February 2025, deepening integrations...
Arize AI announced a strategic partnership expansion with Microsoft in February 2025, deepening integrations with Azure AI for LLM evaluation and observability, coinciding with M12's participation in the Series C round.
funding-research →Feb 20, 2025
Funding: Arize AI closed a $70 million Series C led by Adams Street Partners with...
Arize AI closed a $70 million Series C led by Adams Street Partners with participation from M12, Sinewave Ventures, OMERS Ventures, Datadog, PagerDuty, TCV, Battery Ventures, and Swift Ventures.
funding-research →Feb 20, 2025
Funding: Arize AI closed a $70 million Series C round on February 20, 2025, led...
Arize AI closed a $70 million Series C round on February 20, 2025, led by Adams Street Partners with participation from M12, Sinewave Ventures, OMERS Ventures, Datadog, PagerDuty, TCV, Battery Ventures, Foundation Capital, and Swift Ventures.
funding-research →Jun 1, 2025
Product Launch: Langfuse open-sourced all product features under the MIT license, including LLM-as-a-Judge, annotation queues, and...
Langfuse open-sourced all product features under the MIT license, including LLM-as-a-Judge, annotation queues, and prompt experiments.
funding-research →Jun 1, 2025
Product Launch: In June 2025, Langfuse open-sourced all product features under the MIT license and reduced...
In June 2025, Langfuse open-sourced all product features under the MIT license and reduced its Core plan price 50% from $59/month to $29/month.
funding-research →Oct 1, 2025
Funding: LangChain raised a $125 million Series B led by IVP at a $1.25 billion...
LangChain raised a $125 million Series B led by IVP at a $1.25 billion valuation, with participation from Sequoia, Benchmark, CapitalG, Sapphire Ventures, ServiceNow Ventures, Workday Ventures, Cisco Investments, Datadog, Databricks, and Frontline.
funding-research →Oct 1, 2025
Product Launch: LangChain released LangChain 1.0, marking the platform's maturity for agent engineering, announced alongside its...
LangChain released LangChain 1.0, marking the platform's maturity for agent engineering, announced alongside its Series B round.
funding-research →Oct 20, 2025
Product Launch: LangChain released LangChain 1.0 and LangGraph 1.0, including a new Insights Agent and no-code...
LangChain released LangChain 1.0 and LangGraph 1.0, including a new Insights Agent and no-code agent builder.
funding-research →Oct 20, 2025
Funding: LangChain raised a $125 million Series B led by IVP with participation from Sequoia...
LangChain raised a $125 million Series B led by IVP with participation from Sequoia Capital, Benchmark, CapitalG, and Sapphire Ventures at a $1.25 billion post-money valuation.
funding-research →Jan 16, 2026
Acquisition: ClickHouse acquired Langfuse as part of its AI infrastructure expansion, with no separate Langfuse...
ClickHouse acquired Langfuse as part of its AI infrastructure expansion, with no separate Langfuse round amount disclosed.
funding-research →Jan 16, 2026
Acquisition: On January 16, 2026, ClickHouse acquired Langfuse GmbH to integrate its open-source LLM observability...
On January 16, 2026, ClickHouse acquired Langfuse GmbH to integrate its open-source LLM observability platform with ClickHouse's database, announced simultaneously with ClickHouse's $400M Series D at a $15B valuation.
funding-research →Feb 17, 2026
Funding: Braintrust Data raised $80 million Series B led by Iconiq Capital (with Andreessen Horowitz,...
Braintrust Data raised $80 million Series B led by Iconiq Capital (with Andreessen Horowitz, Greylock, Basecase Capital, and Elad Gil) at an $800 million valuation.
funding-research →Feb 17, 2026
Funding: Braintrust raised an $80 million Series B led by ICONIQ Capital, with participation from...
Braintrust raised an $80 million Series B led by ICONIQ Capital, with participation from Andreessen Horowitz, Greylock Partners, Basecase Capital, and Elad Gil, at an $800 million post-money valuation.
funding-research →Apr 1, 2026
Company Fact: Arize AI reached a post-money Series D valuation of approximately $741.84 million.
funding-research →Jun 1, 2026
Funding: ClickHouse (Langfuse's acquirer) closed a $15B funding round led by Dragoneer.
funding-research →Jun 28, 2026
News Mention: Langfuse Review: The Best Open-Source LLM Observability Platform - quasa.io <a href="https://news.google.com/rss/articles/CBMijwFBVV95cUxOcXJvTFNkWUphVzNJTDl2UUIzUXpRM1h5MVFzWlNJZHdSWWw3NlBXQ2R4d3pOeWhnczVpLVFtNnU3dE9TUlB1MG9veFY5Q0RwYVhfaTZaVGhNZFY1c04tZzM3LTJ0bWNjSk5zMUo2b25ZYnlueDJLZmNLbjlEdl80aVBwclVWSGM5Vk9zUVRFZw?oc=5" target="_blank">Langfuse Review:...
Langfuse Review: The Best Open-Source LLM Observability Platform - quasa.io <a href="https://news.google.com/rss/articles/CBMijwFBVV95cUxOcXJvTFNkWUphVzNJTDl2UUIzUXpRM1h5MVFzWlNJZHdSWWw3NlBXQ2R4d3pOeWhnczVpLVFtNnU3dE9TUlB1MG9veFY5Q0RwYVhfaTZaVGhNZFY1c04tZzM3LTJ0bWNjSk5zMUo2b25ZYnlueDJLZmNLbjlEdl80aVBwclVWSGM5Vk9zUVRFZw?oc=5" target="_blank">Langfuse Review: The Best Open-Source LLM Observability Platform</a> <font color="#6f6f6f">quasa.io</font>
gnews-langfuse →Jul 2, 2026
News Mention: 15 AI Agent Observability Tools in 2026: AgentOps & Langfuse - AIMultiple <a href="https://news.google.com/rss/articles/CBMiU0FVX3lxTFA2VkFHMHJtT1JtN3l0b2NoNWxRMnR3NWVTOWJfenRGS1NVZk9wRFNtUFcyM2lvRFlyR1NhUEthYmpRb3k1YnZvUmstRDdPaVB0dUg0?oc=5"...
15 AI Agent Observability Tools in 2026: AgentOps & Langfuse - AIMultiple <a href="https://news.google.com/rss/articles/CBMiU0FVX3lxTFA2VkFHMHJtT1JtN3l0b2NoNWxRMnR3NWVTOWJfenRGS1NVZk9wRFNtUFcyM2lvRFlyR1NhUEthYmpRb3k1YnZvUmstRDdPaVB0dUg0?oc=5" target="_blank">15 AI Agent Observability Tools in 2026: AgentOps & Langfuse</a> <font color="#6f6f6f">AIMultiple</font>
gnews-arize →Jul 9, 2026
News Mention: AI Chatbot Evaluation and Observability with Promptfoo and Langfuse - Netguru <a href="https://news.google.com/rss/articles/CBMiiwFBVV95cUxNSkZTZWlrcHRMMGF5cjB3bF9PYl9XOWd1a25wRURoVkNuVGhOWENKYVVKdU1RcGZFTGFfLUZJZDBCNnNDWEdmbjNFZ0VkSHgzTGhZWnkxbDNZLW5sMFJmaTBVbzRBekZYampuZGg3U3lZeTB5UV9uQ2cyZndNakZJQ2RYT2ZjeXNRY2R3?oc=5" target="_blank">AI...
AI Chatbot Evaluation and Observability with Promptfoo and Langfuse - Netguru <a href="https://news.google.com/rss/articles/CBMiiwFBVV95cUxNSkZTZWlrcHRMMGF5cjB3bF9PYl9XOWd1a25wRURoVkNuVGhOWENKYVVKdU1RcGZFTGFfLUZJZDBCNnNDWEdmbjNFZ0VkSHgzTGhZWnkxbDNZLW5sMFJmaTBVbzRBekZYampuZGg3U3lZeTB5UV9uQ2cyZndNakZJQ2RYT2ZjeXNRY2R3?oc=5" target="_blank">AI Chatbot Evaluation and Observability with Promptfoo and Langfuse</a> <font color="#6f6f6f">Netguru</font>
gnews-langfuse →Jul 17, 2026
News Mention: The 10 Coolest AI Observability And Governance Tools Of 2026 (So Far) - crn.com...
The 10 Coolest AI Observability And Governance Tools Of 2026 (So Far) - crn.com <a href="https://news.google.com/rss/articles/CBMiqwFBVV95cUxOWlllb2s2Sk5CVk5PVmNmMUp4MEpFRXFhYjhBNXdiRWVnLVU2T0xKakFaWC1YbGJicUUtNV9qSGZKZ01PYzhYR0NhYUtzYmtSZC1PaHJXNTJwV3VEUUxsb2FJMDAtSE1WSXdvYnd6ODRkM2pUOTU4alZiTUtBb1JkaGtXZWFEaHpnNGc1TjlMNUtUV2cxS09Qd2FDUjdxNURXazdXVkhmSWVtZFE?oc=5" target="_blank">The 10 Coolest AI Observability And Governance Tools Of 2026 (So Far)</a> <font color="#6f6f6f">crn.com</font>
gnews-arize →
Milestones merged from 0 curated events, 0 verified facts (with observed dates), and 25 business signals from the last 24 months. Deduped by date + label; curated entries take precedence.
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