feat(llm, anthropic): Add support for Claude Opus 5.5 - #1191
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`anthropic/claude-opus-5-5` is now a recognized model, with its June 2026 knowledge cutoff and the always-on thinking that Opus 5.5 shares with Fable 5.1. That flag is what keeps requests valid: JP never sends `thinking: disabled`, which the model rejects with a 400, and a forced `tool_choice` downgrades to a soft-force nudge rather than the hard retry, since `any` and `tool` are rejected just the same. Everything else the model needs already falls out of the capabilities API or of code written for Fable 5.1: the 1M context window, the 128k output ceiling, the effort ladder, structured output, and strict tool use. Text the model writes between tool calls arrives in `thinking` blocks that are empty at the provider's default `display`, but JP already asks for `summarized`, so that narration still reaches the terminal. The `opus` alias in this repository's own config points at the new model. T-0q1k0j4 records the one gap the migration guide surfaced: JP repairs rejected thinking blocks only after the API refuses a request it had the information to predict. Signed-off-by: Jean Mertz <git@jeanmertz.com>
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anthropic/claude-opus-5-5is now a recognized model, with its June 2026 knowledge cutoff and the always-on thinking that Opus 5.5 shares with Fable 5.1. That flag is what keeps requests valid: JP never sendsthinking: disabled, which the model rejects with a 400, and a forcedtool_choicedowngrades to a soft-force nudge rather than the hard retry, sinceanyandtoolare rejected just the same.Everything else the model needs already falls out of the capabilities API or of code written for Fable 5.1: the 1M context window, the 128k output ceiling, the effort ladder, structured output, and strict tool use. Text the model writes between tool calls arrives in
thinkingblocks that are empty at the provider's defaultdisplay, but JP already asks forsummarized, so that narration still reaches the terminal.The
opusalias in this repository's own config points at the new model. T-0q1k0j4 records the one gap the migration guide surfaced: JP repairs rejected thinking blocks only after the API refuses a request it had the information to predict.