# llm-anthropic 0.26 Adds Claude 5 and Server-Side Tools > Source: > Published: 2026-08-05 00:33:21+00:00 # llm-anthropic 0.26 Adds Claude 5 and Server-Side Tools Simon Willison released llm-anthropic 0.26 on August 4, adding Claude Fable 5, Sonnet 5 and Opus 5 model IDs to the LLM plugin. The release also exposes Anthropic server-side WebSearch, WebFetch, CodeExecution and MCP tools through LLM's tool interface, upgrades the plugin to LLM 0.32, and replaces older thinking options with the new thinking and thinking_effort controls. Simon Willison released llm-anthropic 0.26 on August 4, 2026. The open-source plugin connects the LLM command-line tool and Python library to Anthropic's API, and the new version updates both the model catalog and the way developers invoke Anthropic-specific capabilities. ### Claude 5 model IDs arrive in the plugin Version 0.26 registers claude-fable-5, claude-sonnet-5 and claude-opus-5. That lets LLM users select those API model IDs through the same command-line and Python interfaces used for other supported models. The release does not introduce the models themselves; it adds support for them to this particular plugin. The package now requires LLM 0.32 or newer. As a result, reasoning, tool calls, tool results and results from server-side tools can stream as typed events. Reasoning text is shown on standard error by default in the command-line interface, while --hide-reasoning or -R suppresses it. ### Server-side tools use the common tool interface The plugin exposes Anthropic's WebSearch, WebFetch, CodeExecution and AnthropicMCP server-side tools through LLM's -T option or the Python tools= argument. The former web_search options were removed in favor of the tool interface, so scripts that use those older switches need to migrate. Extended-thinking controls are also simpler. The supported options are now thinking and thinking_effort, with effort levels from low through max. Older thinking_budget, thinking_display and thinking_adaptive options have been removed. Claude 5 models think by default under the plugin's new behavior; thinking can be disabled for Sonnet 5 and Opus 5, while Fable 5 always uses it. For practitioners, the release is chiefly a compatibility and migration update. Upgrade LLM and the plugin together, replace removed web-search and thinking options, and test any code that consumes streamed responses because the 0.32 stack now emits structured event types rather than treating every chunk as plain text. ## Key Points - 1llm-anthropic 0.26 registers Claude Fable 5, Sonnet 5 and Opus 5 model IDs without presenting the plugin release as the launch of those models. - 2Anthropic server-side web search, web fetch, code execution and MCP capabilities now use LLM's common tool interface instead of the removed web_search options. - 3The plugin requires LLM 0.32 and replaces older extended-thinking settings with thinking and thinking_effort controls while streaming structured reasoning and tool events. ## Scoring Rationale The plugin release gives LLM users immediate access to current Claude model IDs and a unified path for Anthropic server-side tools, with concrete migration work for removed options. Its impact is meaningful for developers using this integration but narrower than the underlying model launches. ## Sources Primary source and supporting public references used for this report. Practice interview problems based on real data 1,625 SQL & Python problems across 15 industry datasets — the exact type of data you work with. [Try 250 free problems](/problems)