AWhat changed
Combined fast-response and reinforcement-learned extended-thinking modes in a model family with controllable thinking budgets, later extending the system to tool use during thinking and summarized long reasoning traces.
Scientific scope
Combined fast-response and reinforcement-learned extended-thinking modes in a model family with controllable thinking budgets, later extending the system to tool use during thinking and summarized long reasoning traces. Integrated hybrid-reasoning system, not invention of chain-of-thought, RL reasoning or thought/tool alternation. Sonnet3.7 and Claude4 are bundled; only the latter adds within-thinking tool use and summaries. Visible reasoning is not guaranteed faithful, and safety/performance findings are source-reported.
Evidence
The linked original sources describe the stated contribution and its evidence limits. WRS has not independently rerun the experiments or certified a proof. Integrated hybrid-reasoning system, not invention of chain-of-thought, RL reasoning or thought/tool alternation. Sonnet3.7 and Claude4 are bundled; only the latter adds within-thinking tool use and summaries. Visible reasoning is not guaranteed faithful, and safety/performance findings are source-reported.
Contributors
- Source-listed authors and technical contributors · SCIENCE: Source-listed authors or explicitly credited technical contributors for the cited versions. Family entries retain source-specific attribution; a combined list is not one original-paper byline or equal individual work. Names alone do not establish resolved identities.
- Claude 3.7 Sonnet System Card
- Claude Opus 4 & Claude Sonnet 4 System Card
- Claude3.7 Sonnet and Claude Code
- Introducing Claude4
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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