Introducing Claude Opus 4.5
Our newest model, Claude Opus 4.5, is available today. It’s intelligent, efficient, and the best model in the world for coding, agents, and computer use.
Anthropic changelog: November 2025
2 releases from to
Everything Anthropic shipped in November 2025, collected from official Anthropic sources. Each entry is dated and links to the page it came from.
November 2025 at a glance
November 2025 was Anthropic's 5th busiest month of the 12 months to then: 2 releases, close to its monthly average of 1. That was 1 release fewer than October 2025. Releases were spread across Model (1) and Research (1).
Releases
2
-1 vs October 2025
Rank of 12 months
5th
Average 1.4 a month
Most shipped
Model
1 release
Notable Anthropic launches in November 2025
- Model
Introducing Claude Opus 4.5
Our newest model, Claude Opus 4.5, is available today. It’s intelligent, efficient, and the best model in the world for coding, agents, and computer use.
Source: Anthropic - Research
Political Even-Handedness Evaluation Methodology Release
Announced a new automated evaluation method to test for political even-handedness in Claude, including open-sourcing the methodology for AI developers to reproduce findings and improve measures of political bias.
Source: Anthropic
All Anthropic releases in November 2025
Newest first. Each entry links to the official page it came from.
November 20252 releases
Political Even-Handedness Evaluation Methodology Release
Announced a new automated evaluation method to test for political even-handedness in Claude, including open-sourcing the methodology for AI developers to reproduce findings and improve measures of political bias.
Where November 2025 sits
Anthropic releases per month, for November 2025 and the 11 months before it. A taller bar means more releases that month; the dated entries for each month are on its own page.
Other companies in November 2025
11 of the companies we track shipped in November 2025; Anthropic ranks 5th by number of releases.
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