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Model: "claude-3-sonnet-5"
not much happened today
claude-3-sonnet-5 claude-3-sonnet anthropic agentic-ai tool-use coding context-windows model-pricing platform-integration linux-support managed-agents model-launch rumor-cycle kimmonismus claudedevs claudeai scaling01 theo
Anthropic launched Claude Sonnet 5 as its new default mid-tier frontier model, featuring a 1M-token context window, enhanced agentic capabilities including planning, browser and terminal tool use, and autonomous execution previously requiring larger models. The model is available across Claude, Claude Code, API, and Managed Agents with promotional pricing of $2/M input tokens and $10/M output tokens through early September. The launch included platform expansions such as Claude Desktop on Linux (Ubuntu/Debian beta) and updates to Managed Agents with new observability and integration features. The release followed a rumor cycle involving Sonnet 5 and a separate Fable 5 model, which did not launch as expected, leading to community discussion about access and capabilities.