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Update claude-api skill: Claude Opus 5 (#1476)
* Update claude-api skill: Claude Opus 5 - Add Claude Opus 5 (`claude-opus-5`) as the default model across all SDK examples, model tables, pricing, and migration guidance. - Add an Opus 5 migration section covering the API changes that come with it, and move Opus 4.8 into the previous-generation slot. - Drop the Opus 4.7 fast-mode guidance, which no longer applies. - Scope the server-side fallbacks beta header to the current version. * Update claude-api skill: Opus 5 fast-follow corrections - Server-side refusal fallbacks are available on Claude Platform on AWS, not just the Claude API. Correct the availability statements in SKILL.md, the migration guide, and the platform-availability table. - Simplify the effort guidance: start at `high` (the API default) and sweep down, rather than starting at `xhigh` for coding work. - Add a time-to-first-token section with the prompt instruction that reduces pre-answer thinking on latency-sensitive routes. - Replace the two separate thinking-disabled mitigations with the single combined instruction that covers both failure modes.
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Lance Martin
@@ -59,6 +59,7 @@ curl https://api.anthropic.com/v1/models/claude-opus-4-8 \
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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 5 | `claude-opus-5` | — | 1M | 128K | Active |
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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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@@ -69,7 +70,8 @@ curl https://api.anthropic.com/v1/models/claude-opus-4-8 \
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### Model Descriptions
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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; the raw chain of thought is never returned — summaries via `display: "summarized"`). Same tokenizer as Opus 4.8 (token counts roughly unchanged vs Opus 4.7/4.8). 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 5** — For complex agentic coding and enterprise work; a step-change over Claude Opus 4.8, strongest on deep reasoning, agentic and long-horizon work, and test-time compute scaling, at half the cost of Claude Fable 5 (Claude Fable 5 remains the highest-capability tier). Safety classifiers can return `stop_reason: "refusal"` — handle it before reading `content`. A drop-in upgrade at Opus 4.8's pricing ($5/$25 per MTok) with the same feature set. Thinking is on by default (omitting `thinking` runs adaptive; `{type: "adaptive"}` is equivalent), and `thinking: {type: "disabled"}` is available only at effort `high` or lower — pairing it with `xhigh`/`max` returns a 400. Raw thinking tokens are never returned. Full effort ladder through `max`; 512-token prompt-cache minimum (down from 1024 on Opus 4.8); fast mode on the Claude API only. Elevated cybersecurity safeguards. Separate rate-limit bucket from the combined Opus 4.x pool. 1M context window (default and maximum), 128K max output. See `shared/model-migration.md` → Migrating to Claude Opus 5.
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- **Claude Opus 4.8** — The most capable model in the Opus 4 series — 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 5** — The best combination of speed and intelligence in the Sonnet tier; near-Opus quality on coding and agentic work. Adaptive thinking on by default (omitting `thinking` runs adaptive); manual `budget_tokens` removed; non-default sampling parameters rejected. `effort` supports `low`/`medium`/`high`/`xhigh`/`max`. New tokenizer (~30% more tokens for the same text vs Sonnet 4.6). High-resolution vision (2576px). 1M context window, 128K max output. See `shared/model-migration.md` → Migrating to Claude Sonnet 5.
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@@ -81,7 +83,7 @@ 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` | Deprecated (retires 2026-08-05 — migrate to `claude-opus-4-8`) |
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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-5`) |
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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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@@ -115,13 +117,14 @@ When a user asks for a model by name, use this table to find the correct model I
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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" | `claude-opus-5` |
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| "opus 5" | `claude-opus-5` |
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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` (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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| "opus 4.1" | `claude-opus-4-1` (deprecated, retires 2026-08-05 — suggest `claude-opus-5`) |
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| "opus 4", "opus 4.0" | `claude-opus-4-0` (deprecated — suggest `claude-opus-5`) |
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| "sonnet", "balanced" | `claude-sonnet-5` |
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| "sonnet 5" | `claude-sonnet-5` |
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| "sonnet 4.6" | `claude-sonnet-4-6` |
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