Oleksandr Kuzmenko, EditorPublished 4 min readAI-assisted · editor-reviewed
TL;DR
- Adds support for Claude 5 models (fable-5, sonnet-5, opus-5).
- Enables server-side tool calling via the -T flag.
- Simplifies thinking effort configuration across five levels.
Key facts
- Supported Models
- claude-fable-5, claude-sonnet-5, claude-opus-5
- Dependency Requirement
- llm>=0.32
- Server-Side Tools
- WebSearch, WebFetch, CodeExecution, AnthropicMCP
- Thinking Effort Options
- low, medium, high, xhigh, max
Native Server-Side Tools and MCP Integration
The updated llm-anthropic plugin standardizes server-side tool invocations under the unified -T flag in the llm CLI. Developers can invoke WebSearch, WebFetch, CodeExecution, and AnthropicMCP directly without maintaining custom client-side execution loops. Server-side tool execution and reasoning events stream as typed events when paired with llm>=0.32.
Simplified Reasoning and Thinking Controls
Extended thinking configuration replaces options like thinking_budget, thinking_display, and thinking_adaptive with streamlined thinking and thinking_effort settings (low, medium, high, xhigh, max). For claude-sonnet-5 and claude-opus-5, thinking can be toggled off via -o thinking 0, while claude-fable-5 keeps thinking enabled permanently. Use -R or --hide-reasoning to suppress reasoning tokens from standard output and logging streams.
Try it in 2 minutes
llm -m claude-sonnet-5 -T WebSearch "Latest AI developments"When to use
- When running Claude 5 models and requiring server-side tool use via the LLM command line tool.
When NOT to use
- When you are using older versions of the LLM CLI below 0.32 without updating.
What to do today
- Upgrade your llm package to version 0.32 or newer.
- Use the -T flag to trigger server-side tools like WebSearch or CodeExecution.
Step names are taken from What to do today.
Step names are taken from What to do today. Upgrade your llm package to version 0.32 or newer.. Use the -T flag to trigger server-side tools like WebSearch or CodeExecution.
- Upgrade your llm package to version 0.32 or newer.
- Use the -T flag to trigger server-side tools like WebSearch or CodeExecution.