Opus 4.5
A high-performance language model in Anthropic's Claude Opus series, designed for complex planning and text generation tasks.
Timeline (last 90 days)
Opus 4.5 no longer exhibits context anxiety, so the old reset logic became redundant.
Opus 4.5 was basically a perfect-score answer in this test, and the UP host commented "indeed powerful".
The turning point in Matt Pocock's attitude toward AI programming came during the release of Opus 4.5 and the formation of the OpenClaw ecosystem, after which he no longer writes code himself.
Since the release of Opus 4.5, 100% of Boris's code has been written by Claude Code.
At the time of course recording, Claude Code's default model was Opus 4.5, with Sonnet and Haiku also available as options.
Lee Robinson used Opus 4.5 to draft a migration plan for moving the Cursor website from a headless CMS back into code, and the actual migration only took three days.
Opus 4.6 scored only 4/28 and Opus 4.5 scored 19/28, despite content being entirely correct throughout; the author classified these as formatting failures rather than financial capability defects.
According to Anthropic data, by May 2026 Claude was writing more than 80% of the company's code; Opus 4.5 has a 51% probability of suggesting a better next step when researchers choose a weaker direction, and the Mythos preview raises that figure to 64%.
The blogger used Opus 4.5 to refactor the entire Harbor system on Next.js and Convex.
Andrew believes that Cloud Code combined with Opus 4.5 can answer the vast majority of data questions almost without hesitation.
3 more timeline events
All Facts (12)
Opus 4.5于11月发布，4.6于2月发布，4.7也已发布
70%UnverifiedOpus 4.5 no longer exhibits context anxiety, so the old reset logic became redundant.
50%UnverifiedOpus 4.5 was basically a perfect-score answer in this test, and the UP host commented "indeed powerful".
50%UnverifiedSince the release of Opus 4.5, 100% of Boris's code has been written by Claude Code.
50%UnverifiedAt the time of course recording, Claude Code's default model was Opus 4.5, with Sonnet and Haiku also available as options.
50%UnverifiedAccording to Anthropic data, by May 2026 Claude was writing more than 80% of the company's code; Opus 4.5 has a 51% probability of suggesting a better next step when researchers choose a weaker direction, and the Mythos preview raises that figure to 64%.
50%UnverifiedThe blogger used Opus 4.5 to refactor the entire Harbor system on Next.js and Convex.
50%UnverifiedAndrew believes that Cloud Code combined with Opus 4.5 can answer the vast majority of data questions almost without hesitation.
50%UnverifiedThe blogger rebuilt the product Harbor on Next.js and Convex using Opus 4.5, and the product is now a SaaS generating $10,000 per month.
50%UnverifiedWhen the author initially used early models such as Opus 4.5 to generate circuit boards, the models were unable to understand component orientation or complete reasonable trace routing.
50%UnverifiedThe turning point in Matt Pocock's attitude toward AI programming came during the release of Opus 4.5 and the formation of the OpenClaw ecosystem, after which he no longer writes code himself.
50%UnverifiedLee Robinson used Opus 4.5 to draft a migration plan for moving the Cursor website from a headless CMS back into code, and the actual migration only took three days.
50%