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Update claude-api skill: Claude Fable 5 and Claude Mythos 5 (#1294)

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- Add Claude Fable 5 and Claude Mythos 5 to the model tables with pricing,
  context window, and model-selection guidance
- Document Fable-specific API behavior: always-on adaptive thinking (explicit
  disabled returns 400), protected-thinking display and replay rules, new
  tokenizer (~30% more tokens), refusal stop reason with server-side fallbacks
  and SDK fallback middleware, 30-day data-retention requirement
- Add the full Migrating to Claude Fable 5 guide section and checklist,
  including the Mythos Preview migration path
- Refresh skill trigger description, effort/compaction/task-budget notes,
  caching minimums, structured-output and dynamic-filtering support tables
This commit is contained in:
Lance Martin
2026-06-09 10:34:55 -07:00
committed by GitHub
parent c30d329f58
commit 5d25128289
13 changed files with 306 additions and 40 deletions
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skills/claude-api/go/claude-api.md
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@@ -29,7 +29,7 @@ client := anthropic.NewClient(
## Model Constants
The Go SDK provides typed model constants: `anthropic.ModelClaudeOpus4_8`, `anthropic.ModelClaudeOpus4_7`, `anthropic.ModelClaudeSonnet4_6`, `anthropic.ModelClaudeHaiku4_5_20251001`. Use `ModelClaudeOpus4_8` unless the user specifies otherwise.
The Go SDK provides typed model constants: `anthropic.ModelClaudeFable5`, `anthropic.ModelClaudeOpus4_8`, `anthropic.ModelClaudeOpus4_7`, `anthropic.ModelClaudeSonnet4_6`, `anthropic.ModelClaudeHaiku4_5_20251001`. Use `ModelClaudeOpus4_8` unless the user specifies otherwise; if they ask for Fable or the most powerful model, use `anthropic.ModelClaudeFable5` (see `shared/models.md` for the full resolution table).
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