Next step

More settings in model, in alphabetical order.

• Setting · model Sonnet 5 5 Advisor Use Claude Sonnet 5.5 as the advisor your main model consults at decision points (before committing to an approach, on a recurring error, before declaring a task done). A lower-cost second opinion for these main models: Haiku 4.5 or 5.5, Sonnet 4.6, 5 or 5.5, and Opus 4.6, 4.7 or 4.8. Claude Code does not attach it to Opus 5 or later, or to Fable. Pinned to the full model ID, so it stays on 5.5. Requires Claude Code v2.1.287+ on the Anthropic API or v2.1.300+ on Claude Platform on AWS; on the Anthropic API, the advisor stays off when DISABLE_TELEMETRY or CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC is set.
  npx … --setting model/sonnet-5-5-advisor

  Add to stack
• Setting · model Sonnet Opus Advisor Haiku Subagents Sonnet as the main model, Opus as the advisor it consults at decision points, and Haiku for every subagent, including agents whose definition pins another model (remove CLAUDE_CODE_SUBAGENT_MODEL_FORCE to let them keep theirs). Uses aliases, so it follows the latest version of each family. The advisor needs the Anthropic API and stays off when DISABLE_TELEMETRY or CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC is set; the force flag needs Claude Code v2.1.257+.
  npx … --setting model/sonnet-opus-advisor-haiku-subagents

  Add to stack
• Setting · model Use Haiku Use Claude Haiku 5.5 as the main model, the fastest and lowest-cost option for simple, well-scoped tasks. Pinned to the full model ID (claude-haiku-5-5), so it stays on Haiku 5.5 instead of following the 'haiku' alias. Requires Claude Code v2.1.293+; on Bedrock, Vertex or Foundry use your provider's model name instead.
  npx … --setting model/use-haiku

  Add to stack
• Setting · model Use Opus Use Claude Opus 5.5 as the main model, for complex reasoning, large refactors and long agentic tasks. Pinned to the full model ID (claude-opus-5-5), so it stays on Opus 5.5 instead of following the 'opus' alias. Requires Claude Code v2.1.280+; on Bedrock, Vertex or Foundry use your provider's model name instead.
  npx … --setting model/use-opus

  Add to stack
• Setting · model Use Sonnet Use Claude Sonnet 5.5 as the main model, for day-to-day coding with a 1M token context window. Pinned to the full model ID (claude-sonnet-5-5), so it stays on Sonnet 5.5 instead of following the 'sonnet' alias. Requires Claude Code v2.1.284+; on Bedrock, Vertex or Foundry use your provider's model name instead.
  npx … --setting model/use-sonnet

  Add to stack
• Setting · model Fable 5 2 Advisor Use Claude Fable 5.2 as the advisor your main model consults at decision points (before committing to an approach, on a recurring error, before declaring a task done). It can advise any main model that supports the advisor. Pinned to the full model ID, so it stays on 5.2 and does not follow future Fable releases. Requires Claude Code v2.1.321+, Fable access and the Anthropic API or Claude Platform on AWS; the advisor stays off when DISABLE_TELEMETRY or CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC is set. If your plan bills Fable to usage credits, run /model fable once to accept that first.
  npx … --setting model/fable-5-2-advisor

  Add to stack