mirror of
https://github.com/anthropics/skills.git
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Lance Martin
b29e7cf65e
* 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.
139 lines
12 KiB
Markdown
139 lines
12 KiB
Markdown
# Claude Model Catalog
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**Only use exact model IDs listed in this file.** Never guess or construct model IDs — incorrect IDs will cause API errors. Use aliases wherever available. For the latest information, WebFetch the Models Overview URL in `shared/live-sources.md`, or query the Models API directly (see Programmatic Model Discovery below).
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## Programmatic Model Discovery
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For **live** capability data — context window, max output tokens, feature support (thinking, vision, effort, structured outputs, etc.) — query the Models API instead of relying on the cached tables below. Use this when the user asks "what's the context window for X", "does model X support vision/thinking/effort", "which models support feature Y", or wants to select a model by capability at runtime.
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```python
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m = client.models.retrieve("claude-opus-4-8")
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m.id # "claude-opus-4-8"
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m.display_name # "Claude Opus 4.8"
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m.max_input_tokens # context window (int)
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m.max_tokens # max output tokens (int)
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# capabilities is an untyped nested dict — bracket access, check ["supported"] at the leaf
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caps = m.capabilities
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caps["image_input"]["supported"] # vision
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caps["thinking"]["types"]["adaptive"]["supported"] # adaptive thinking
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caps["effort"]["max"]["supported"] # effort: max (also low/medium/high)
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caps["structured_outputs"]["supported"]
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caps["context_management"]["compact_20260112"]["supported"]
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# filter across all models — iterate the page object directly (auto-paginates); do NOT use .data
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[m for m in client.models.list()
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if m.capabilities["thinking"]["types"]["adaptive"]["supported"]
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and m.max_input_tokens >= 200_000]
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```
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Top-level fields (`id`, `display_name`, `max_input_tokens`, `max_tokens`) are typed attributes. `capabilities` is a dict — use bracket access, not attribute access. The API returns the full capability tree for every model with `supported: true/false` at each leaf, so bracket chains are safe without `.get()` guards. TypeScript SDK: same method names, also auto-paginates on iteration.
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### Raw HTTP
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```bash
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curl https://api.anthropic.com/v1/models/claude-opus-4-8 \
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-H "x-api-key: $ANTHROPIC_API_KEY" \
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-H "anthropic-version: 2023-06-01"
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```
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```json
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{
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"id": "claude-opus-4-8",
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"display_name": "Claude Opus 4.8",
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"max_input_tokens": 1000000,
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"max_tokens": 128000,
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"capabilities": {
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"image_input": {"supported": true},
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"structured_outputs": {"supported": true},
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"thinking": {"supported": true, "types": {"enabled": {"supported": false}, "adaptive": {"supported": true}}},
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"effort": {"supported": true, "low": {"supported": true}, …, "max": {"supported": true}},
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…
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}
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}
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```
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## Current Models (recommended)
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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 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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| Claude Sonnet 5 | `claude-sonnet-5` | — | 1M | 128K | Active |
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| Claude Sonnet 4.6 | `claude-sonnet-4-6` | - | 1M | 128K | Active |
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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 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 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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- **Claude Sonnet 4.6** — Previous-generation Sonnet. Supports adaptive thinking (recommended). 1M context window. 128K max output tokens.
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- **Claude Haiku 4.5** — Fastest and most cost-effective model for simple tasks.
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## Legacy Models (still active)
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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-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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| Friendly Name | Alias (use this) | Full ID | Status | Retires |
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|-------------------|---------------------|-------------------------------|------------|--------------|
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| Claude Sonnet 4 | `claude-sonnet-4-0` | `claude-sonnet-4-20250514` | Deprecated | TBD |
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| Claude Opus 4 | `claude-opus-4-0` | `claude-opus-4-20250514` | Deprecated | TBD |
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| Claude Haiku 3 | — | `claude-3-haiku-20240307` | Deprecated | Apr 19, 2026 |
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## Retired Models (no longer available)
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| Friendly Name | Full ID | Retired |
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|-------------------|-------------------------------|-------------|
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| Claude Sonnet 3.7 | `claude-3-7-sonnet-20250219` | Feb 19, 2026 |
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| Claude Haiku 3.5 | `claude-3-5-haiku-20241022` | Feb 19, 2026 |
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| Claude Opus 3 | `claude-3-opus-20240229` | Jan 5, 2026 |
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| Claude Sonnet 3.5 | `claude-3-5-sonnet-20241022` | Oct 28, 2025 |
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| Claude Sonnet 3.5 | `claude-3-5-sonnet-20240620` | Oct 28, 2025 |
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| Claude Sonnet 3 | `claude-3-sonnet-20240229` | Jul 21, 2025 |
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| Claude 2.1 | `claude-2.1` | Jul 21, 2025 |
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| Claude 2.0 | `claude-2.0` | Jul 21, 2025 |
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## Resolving User Requests
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When a user asks for a model by name, use this table to find the correct model ID:
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| User says... | Use this model ID |
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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-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-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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| "sonnet 4.5" | `claude-sonnet-4-5` |
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| "sonnet 4", "sonnet 4.0" | `claude-sonnet-4-0` (deprecated — suggest `claude-sonnet-5`) |
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| "sonnet 3.7" | Retired — suggest `claude-sonnet-5` |
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| "sonnet 3.5" | Retired — suggest `claude-sonnet-5` |
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| "haiku", "fast", "cheap" | `claude-haiku-4-5` |
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| "haiku 4.5" | `claude-haiku-4-5` |
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| "haiku 3.5" | Retired — suggest `claude-haiku-4-5` |
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| "haiku 3" | Deprecated — suggest `claude-haiku-4-5` |
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