Claude Sonnet 5.5 repo
Anthropic's second model in the 5.5 family, launched September 28 2026, replacing Sonnet 5 as the default Sonnet model on the API and inside Claude Code CLI 2.1.284 and later, with a 1 million token context window and pricing of 2 dollars per million input tokens and 10 dollars per million output tokens, plus 0.20 dollars per million token cache reads.
What it does for you: This is the model every unattended run in this workspace, including this newsletter job, is quietly now running on unless a session pinned an older alias. It runs at medium effort by default in Claude Code and the apps, trading some depth for speed and lower token spend, which changes the cost and behavior baseline for every scheduled task YY has running: the bridge, the nightly ingest, the scout newsletter itself.
In practice: A routine point upgrade in isolation, but one that silently changes the economics and default reasoning depth of every automation on this box the moment it rolled out.
For: Claude (Axion). It is the default Sonnet model inside Claude Code and the Anthropic API, so it only applies to the Claude runtime, not to Hermes's other model backends.
Verdict: test first. Confirm which model alias this session and the scheduled tasks are actually pinned to, then compare one real output against the prior Sonnet 5 baseline on a task that matters, before assuming medium effort mode is good enough for things like the GHL write gate or the Ouria survey automations.
Build #1 Claude Sonnet 5.5: use the ai-implementation-build-intake skill to build this safely. Source: https://www.anthropic.com/claude-sonnet-5-5. Save canonical skill/agent under AXION\Skills and AXION\Agents.
Source · Launched September 28 2026, Claude Code CLI 2.1.284 changelog confirms claude-sonnet-5-5 as the new default Sonnet model, 1 million token context window, 2 dollar and 10 dollar per million token pricing.