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Update claude-api skill: Claude Fable 5 and Claude Mythos 5 (#1294)
- 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
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Lance Martin
@@ -57,6 +57,8 @@ curl https://api.anthropic.com/v1/models/claude-opus-4-8 \
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| Friendly Name | Alias (use this) | Full ID | Context | Max Output | Status |
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|-------------------|---------------------|-------------------------------|----------------|------------|--------|
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| Claude Fable 5 | `claude-fable-5` | — | 1M | 128K | Active |
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| Claude Mythos 5 | `claude-mythos-5` | — | 1M | 128K | Active (Project Glasswing only) |
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| Claude Opus 4.8 | `claude-opus-4-8` | — | 1M | 128K | Active |
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| Claude Opus 4.7 | `claude-opus-4-7` | — | 1M | 128K | Active |
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| Claude Opus 4.6 | `claude-opus-4-6` | — | 1M | 128K | Active |
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@@ -64,7 +66,9 @@ curl https://api.anthropic.com/v1/models/claude-opus-4-8 \
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| Claude Haiku 4.5 | `claude-haiku-4-5` | `claude-haiku-4-5-20251001` | 200K | 64K | Active |
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### Model Descriptions
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- **Claude Opus 4.8** — The most capable Claude model to date — highly autonomous, state-of-the-art on long-horizon agentic work, knowledge work, and memory; clearer, warmer writing. Same API surface as Opus 4.7 (adaptive thinking only; sampling parameters and `budget_tokens` removed). 1M context window at standard API pricing (no long-context premium). See `shared/model-migration.md` → Migrating to Opus 4.8 — a 4.7 → 4.8 move is a model-ID swap plus prompt re-tuning, no new breaking changes.
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- **Claude Fable 5** — Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work. Same API surface as Opus 4.7/4.8 with one new breaking change: an explicit `thinking: {type: "disabled"}` returns a 400 — omit the `thinking` parameter instead (thinking is always on, returned in protected/encrypted form). New tokenizer (~30% more tokens than Opus-tier for the same content). Safety classifiers may return `stop_reason: "refusal"`. No assistant prefill. Requires 30-day data retention (not available under ZDR). $10/$50 per MTok; 1M context window (default), 128K max output. See `shared/model-migration.md` → Migrating to Claude Fable 5.
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- **Claude Mythos 5** — Same capabilities, pricing, limits, and API behavior as Claude Fable 5; only the model ID differs. Available exclusively through Project Glasswing, where it joins (and succeeds) the invitation-only Claude Mythos Preview (`claude-mythos-preview`). Use it only when the org participates in Project Glasswing; otherwise use claude-fable-5.
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- **Claude Opus 4.8** — The most capable Opus-tier model — highly autonomous, state-of-the-art on long-horizon agentic work, knowledge work, and memory; clearer, warmer writing. Same API surface as Opus 4.7 (adaptive thinking only; sampling parameters and `budget_tokens` removed). 1M context window at standard API pricing (no long-context premium). See `shared/model-migration.md` → Migrating to Opus 4.8 — a 4.7 → 4.8 move is a model-ID swap plus prompt re-tuning, no new breaking changes.
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- **Claude Opus 4.7** — Previous-generation Opus. Highly autonomous; strong on long-horizon agentic work, knowledge work, vision, and memory. Adaptive thinking only; sampling parameters and `budget_tokens` removed. 1M context window. See `shared/model-migration.md` → Migrating to Opus 4.7.
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- **Claude Opus 4.6** — Older Opus. Supports adaptive thinking (recommended), 128K max output tokens (requires streaming for large outputs). 1M context window.
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- **Claude Sonnet 4.6** — Our best combination of speed and intelligence. Supports adaptive thinking (recommended). 1M context window. 64K max output tokens.
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@@ -75,7 +79,7 @@ curl https://api.anthropic.com/v1/models/claude-opus-4-8 \
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| Friendly Name | Alias (use this) | Full ID | Status |
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|-------------------|---------------------|-------------------------------|--------|
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| Claude Opus 4.5 | `claude-opus-4-5` | `claude-opus-4-5-20251101` | Active |
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| Claude Opus 4.1 | `claude-opus-4-1` | `claude-opus-4-1-20250805` | Active |
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| Claude Opus 4.1 | `claude-opus-4-1` | `claude-opus-4-1-20250805` | Deprecated (retires 2026-08-05 — migrate to `claude-opus-4-8`) |
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| Claude Sonnet 4.5 | `claude-sonnet-4-5` | `claude-sonnet-4-5-20250929` | Active |
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## Deprecated Models (retiring soon)
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@@ -105,12 +109,16 @@ When a user asks for a model by name, use this table to find the correct model I
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| User says... | Use this model ID |
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|-------------------------------------------|--------------------------------|
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| "opus", "most powerful" | `claude-opus-4-8` |
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| "fable", "most capable model" | `claude-fable-5` |
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| "most powerful" | `claude-fable-5` |
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| "mythos", "mythos 5" | `claude-mythos-5` (Project Glasswing participants only; otherwise use `claude-fable-5`) |
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| "mythos preview" | `claude-mythos-5` (successor to `claude-mythos-preview` — see migration guide) |
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| "opus" | `claude-opus-4-8` |
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| "opus 4.8" | `claude-opus-4-8` |
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| "opus 4.7" | `claude-opus-4-7` |
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| "opus 4.6" | `claude-opus-4-6` |
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| "opus 4.5" | `claude-opus-4-5` |
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| "opus 4.1" | `claude-opus-4-1` |
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| "opus 4.1" | `claude-opus-4-1` (deprecated, retires 2026-08-05 — suggest `claude-opus-4-8`) |
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| "opus 4", "opus 4.0" | `claude-opus-4-0` (deprecated — suggest `claude-opus-4-8`) |
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| "sonnet", "balanced" | `claude-sonnet-4-6` |
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| "sonnet 4.6" | `claude-sonnet-4-6` |
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