Hydrogen replaces Gemini 3.8 Flash and lifts Terminal-Bench 4.1 from 18.2% to 57%, and it is now the free-tier model. It costs 25% less than Carbon and Argon today and 75% less after their Dec 1 doubling, yet 15x Haiku 5.5's input price. Read: Hydrogen replaces Gemini 3.8 Flash and lifts Terminal-Bench 4.1 from 18.2% to 57%, and it is now the free-tier model. It costs 25% less than Carbon and Argon today and 75% less after their Dec 1 doubling, yet 15x Haiku 5.5's input price. Read: SemiAnalysis tracks over 1.5GW of restricted Nvidia chips that reached China and expects RASA-style export rules to advance without Huang. Many US startups build on Chinese open models trained on Blackwell GPUs, so tighter rules reach that supply. Read: Fable 5.2 also spends less per attempt than GPT-6 Astra, $105 against $235, for ten more points. Across 624 trajectories, most failures came from agents testing on easier inputs than the hidden cases, then shipping work that broke at real scale. Try: Plugins can now declare a Claude Code version range in plugin.json, and clients outside it skip them, so a plugin update no longer breaks older installs. Long hooks in claude -p and SDK sessions send a 30-second heartbeat, so hosts stop ending those turns as hung. Try: Any app that validates client UI messages was exposed: a small request with many malformed parts made validation report every schema for every part. The release also keeps Azure and Vertex credentials from reaching third-party file hosts during downloads. Read: Request logs only show that a call succeeded, so an agent that orders a hot latte for an iced request looks healthy. Grading repeated end-to-end runs measures how often the task is done right, which a single manual test cannot show because outputs vary.
Migrating from Gemini 3.8 Flash to Hydrogen and Decisions API