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© 2026 Simon-Pierre Boucher · AI Atlas. Data is aggregated from public sources and attributed on every page.

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Model Timeline

Timeline of Claude Opus 4.5

Every recorded change for this model by Anthropic, newest first. Back to the entity page →

2 events

Year

Category · events in the last 365 days

All categories Benchmarks4,947 Models2,216 Companies1,599 Research1,104 Releases1,019 Providers & pricing640 Datasets146 Frameworks136 Hardware43 Repositories10 Pricing2

Filtered to one entity. Show the whole atlas

Sept 2026 2

11 Sept 2026
Property changedModelClaude Opus 4.5Anthropic
Claude Opus 4.5: reasoning changed from true to false
ReasoningYes→Noartificial_analysis

artificialanalysis.ai

11 Sept 2026

New modelModelClaude Opus 4.5Anthropic

New model: Claude Opus 4.5 (Anthropic)

anthropic

platform.claude.com

Showing up to 400 events. Narrow by year or category, or use the changes feed for cursor-paged history. Times are UTC.