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The system prompt for Claude Opus was modified between versions 4.6 and 4.7, which may affect its behavior or performance.

AIApr 19, 2026score 0.172 posts · 0 replies across 1 instances
The thread discusses changes in the system prompt of Claude Opus from version 4.6 to 4.7, referencing a blog post by Simon Willison. The changes are noted as significant and relevant to users of the AI model.

Claims

The system prompt for Claude Opus was modified between versions 4.6 and 4.7, which may affect its behavior or performance.
Parent: AIEntity: Claude OpusSub-entity: System promptImpact: neutralDate: Apr 19, 2026 - Apr 20, 2026Target: The modification of the system prompt in Claude Opus between versions 4.6 and 4.7

Source posts

@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 https://simonwillison.net/2026/Apr/18/opus-system-prompt/ #HackerNews #Tech #AI
1 boosts · 0 favs · 0 replies · Apr 19, 2026
#hackernews#tech#ai
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 (simonwillison.net) Link: https://simonwillison.net/2026/Apr/18/opus-system-prompt/ Comments: https://news.ycombinator.com/item?id=47823270
0 boosts · 0 favs · 0 replies · Apr 19, 2026
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 - Simon Willison simonwillison.net/2026/Apr/18/op… #AI #Claude
2 boosts · 0 favs · 0 replies · Apr 19, 2026
#ai#claude
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 - Simon Willison https://simonwillison.net/2026/Apr/18/opus-system-prompt/ #AI #Claude
1 boosts · 0 favs · 0 replies · Apr 19, 2026
#ai#claude
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 https://simonwillison.net/2026/Apr/18/opus-system-prompt/
0 boosts · 0 favs · 0 replies · Apr 19, 2026
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 https://simonwillison.net/2026/Apr/18/opus-system-prompt/ Discussion: https://news.ycombinator.com/item?id=47823270
1 boosts · 0 favs · 0 replies · Apr 20, 2026
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 https://simonwillison.net/2026/Apr/18/opus-system-prompt/ https://news.ycombinator.com/item?id=47823270
1 boosts · 0 favs · 0 replies · Apr 19, 2026
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 | by Simon Willison https://simonwillison.net/2026/Apr/18/opus-system-prompt/#atom-everything #ai #claude #opus47 #aimodels #claudeopus prompting
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#ai#claude#opus47#aimodels#claudeopus
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 simonwillison.net/2026/Apr/18/…
0 boosts · 0 favs · 0 replies · Apr 19, 2026
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 https://simonwillison.net/2026/Apr/18/opus-system-prompt/
0 boosts · 0 favs · 0 replies · Apr 20, 2026
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 https://simonwillison.net/2026/Apr/18/opus-system-prompt/
0 boosts · 0 favs · 0 replies · Apr 20, 2026
@[email protected]
Changes in the system prompt between Claude Opus 4.6 and 4.7 (simonwillison.net) Link: https://simonwillison.net/2026/Apr/18/opus-system-prompt/ Comments: https://news.ycombinator.com/item?id=47823270
0 boosts · 0 favs · 0 replies · Apr 20, 2026