All-Terrain Stack

Upgraded Pro-tier reasoning for harder multi-step problems. Better handling of novel logic patterns and unfamiliar reasoning setups. Stronger “intelligence applied” output quality, producing clearer, more useful explanations and syntheses. More capable support for agentic workflows and longer-horizon task execution. Rolling out as the new Pro model across Gemini app, NotebookLM, Gemini API, and Vertex AI.

Claude Sonnet 5 Release and access: ships as claude-sonnet-5-20260203, available via Anthropic API, Claude Pro, and Google Vertex AI. Coding benchmark jump: posts 82.1% SWE-Bench Verified, positioned above Claude Opus 4.5 at 80.9%. Pricing reset: priced at $3 per 1M input tokens and $15 per 1M output tokens, framed as a major cost drop vs Opus 4.5. Massive context: 1,000,000-token context window for repository-level understanding, whole-codebase prompts, and large refactors without chunking. Agentic engineering stack: built for multi-step workflows with built-in code execution and self-correction, plus a “Dev Team” mode that spawns parallel sub-agents for implementation, testing, and review.