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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/shared/error-codes.md
+7 -3
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@@ -107,10 +107,12 @@ Some 400 errors are specifically related to parameter validation:
- `budget_tokens` >= `max_tokens` in extended thinking
- Invalid tool definition schema
**Model-specific 400s on Opus 4.8 / 4.7:**
**Model-specific 400s on Fable 5 / Opus 4.8 / 4.7:**
- `temperature`, `top_p`, `top_k` are removed — sending any of them returns 400. Delete the parameter; see `shared/model-migration.md` → Per-SDK Syntax Reference.
- `thinking: {type: "enabled", budget_tokens: N}` is removed — sending it returns 400. Use `thinking: {type: "adaptive"}` instead.
- **Fable 5 only:** an explicit `thinking: {type: "disabled"}` returns 400 (it is accepted on Opus 4.8/4.7). Omit the `thinking` param entirely instead.
- **Fable 5 only:** if the organization is set to zero data retention (ZDR) — or any retention below the required 30 days — then **all** Fable 5 requests return `400 invalid_request_error`, even with a perfectly valid payload. Check the org's retention configuration before debugging the request body.
**Common mistake with extended thinking on older models (Opus 4.6 and earlier):**
@@ -168,8 +170,10 @@ thinking: budget_tokens=10000, max_tokens=16000
| Mistake | Error | Fix |
| ------------------------------- | ---------------- | ------------------------------------------------------- |
| `temperature`/`top_p`/`top_k` on Opus 4.8 / 4.7 | 400 | Remove the parameter (see `shared/model-migration.md`) |
| `budget_tokens` on Opus 4.8 / 4.7 | 400 | Use `thinking: {type: "adaptive"}` |
| `temperature`/`top_p`/`top_k` on Fable 5 / Opus 4.8 / 4.7 | 400 | Remove the parameter (see `shared/model-migration.md`) |
| `budget_tokens` on Fable 5 / Opus 4.8 / 4.7 | 400 | Use `thinking: {type: "adaptive"}` |
| `thinking: {type: "disabled"}` on Fable 5 | 400 | Omit the `thinking` param entirely (accepted on Opus 4.8/4.7) |
| Org set to ZDR / retention below 30 days (Fable 5) | 400 on every request | Fix the org's data-retention configuration — the payload isn't the problem |
| `budget_tokens` >= `max_tokens` (older models) | 400 | Ensure `budget_tokens` < `max_tokens` |
| Typo in model ID | 404 | Use valid model ID like `claude-opus-4-8` |
| First message is `assistant` | 400 | First message must be `user` |