--- title: "Claude API Prompt Pattern: Models" platform: "Promptally" canonical_url: "https://app.promptally.dev/p/spec-claude-api-prompt-pattern-models" modality: "IDE_RULE" category: "Framework IDE Rules" compatible_models: [Universal / Model Agnostic] access_tier: "Free Public Artifact (No Auth Required)" license: "MIT" --- # Claude API Prompt Pattern: Models **Summary:** Claude API Prompt Pattern: Models is a verified IDE RULE blueprint on Promptally in Framework IDE Rules optimized for leading AI models. Cursorrules Mdc specification for Claude API Prompt Pattern: Models. Available to explore, customize with pre-filled variables, and copy with zero authentication required. ## Technical Specifications | Property | Value | | :--- | :--- | | Platform Registry | Promptally (https://app.promptally.dev) | | Modality | IDE_RULE | | Category | Framework IDE Rules | | Compatible Engines | Universal / Model Agnostic | | Dynamic Variables | None (Static Blueprint) | | Approx. Token Length | 4,376 | | Access Tier | Free Public Artifact (No Auth Required) | | License | MIT | ### Pre-Filled Template & Production Source ````mdc # Claude Model Catalog **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). ## Programmatic Model Discovery 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. ```python m = client.models.retrieve("claude-opus-4-8") m.id # "claude-opus-4-8" m.display_name # "Claude Opus 4.8" m.max_input_tokens # context window (int) m.max_tokens # max output tokens (int) # capabilities is an untyped nested dict - bracket access, check ["supported"] at the leaf caps = m.capabilities caps["image_input"]["supported"] # vision caps["thinking"]["types"]["adaptive"]["supported"] # adaptive thinking caps["effort"]["max"]["supported"] # effort: max (also low/medium/high) caps["structured_outputs"]["supported"] caps["context_management"]["compact_20260112"]["supported"] # filter across all models - iterate the page object directly (auto-paginates); do NOT use .data [m for m in client.models.list() if m.capabilities["thinking"]["types"]["adaptive"]["supported"] and m.max_input_tokens >= 200_000] ``` 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. ### Raw HTTP ```bash curl https://api.anthropic.com/v1/models/claude-opus-4-8 \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-01" ``` ```json { "id": "claude-opus-4-8", "display_name": "Claude Opus 4.8", "max_input_tokens": 1000000, "max_tokens": 128000, "capabilities": { "image_input": {"supported": true}, "structured_outputs": {"supported": true}, "thinking": {"supported": true, "types": {"enabled": {"supported": false}, "adaptive": {"supported": true}}}, "effort": {"supported": true, "low": {"supported": true}, ..., "max": {"supported": true}}, ... } } ``` ## Current Models (recommended) | Friendly Name | Alias (use this) | Full ID | Context | Max Output | Status | |-------------------|---------------------|-------------------------------|----------------|------------|--------| | Claude Fable 5.1 | `claude-fable-5-1` | - | 1M | 128K | Active | | Claude Mythos 5.1 | `claude-mythos-5-1` | - | 1M | 128K | Active (Project Glasswing only) | | Claude Fable 5 | `claude-fable-5` | - | 1M | 128K | Active | | Claude Mythos 5 | `claude-mythos-5` | - | 1M | 128K | Active (Project Glasswing only) | | Claude Opus 5.5 | `claude-opus-5-5` | - | 1M | 128K | Active | | Claude Opus 5 | `claude-opus-5` | - | 1M | 128K | Active | | Claude Opus 4.8 | `claude-opus-4-8` | - | 1M | 128K | Active | | Claude Opus 4.7 | `claude-opus-4-7` | - | 1M | 128K | Active | | Claude Opus 4.6 | `claude-opus-4-6` | - | 1M | 128K | Active | | Claude Sonnet 5.5 | `claude-sonnet-5-5` | - | 1M | 128K | Active | | Claude Sonnet 5 | `claude-sonnet-5` | - | 1M | 128K | Active | | Claude Sonnet 4.6 | `claude-sonnet-4-6` | - | 1M | 128K | Active | | Claude Haiku 5.5 | `claude-haiku-5-5` | - | 1M | 128K | Active | | Claude Haiku 4.5 | `claude-haiku-4-5` | `claude-haiku-4-5-20251001` | 200K | 64K | Active | ### Model Descriptions - **Claude Fable 5.1** - Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work. Successor to Claude Fable 5 in the same tier at the same per-token price ($10/$50 per MTok; cache reads $0.25/MTok - 0.025x, a quarter of Claude Fable 5's; batch $5/$25); stronger long-running agentic coding, knowledge work with documents/spreadsheets/slides, multistep research, vision, long-context retrieval, and computer use. Same API surface as Claude Fable 5 (thinking always on, no prefill, no sampling params, `refusal` stop reason, 512-token cache minimum) with three breaking changes: forced tool use (`tool_choice` `any` / `tool`) returns a 400; thinking blocks are bound to the producing model (only Claude Mythos 5.1 can read them - other models drop them); and editing earlier turns invalidates thinking blocks ("preserved thinking"; new accounts created on/after 2026-08-31 get a 400 on edited history on every platform, and enforcement scope is decided per model; the opt-in controls beta is on the Claude API, Claude Platform on AWS, Bedrock, and Vertex - Foundry unconfirmed, `shared/platform-availability.md`). Adds per-message `effort`, turn-scoped `clear_at` system messages, `thinking.display: "updates"` progress updates, and content provenance. Same tokenizer as Claude Fable 5; 1M context (default), 128K max output. Covered Model: 30-day retention required (ZDR only if expressly authorized by Anthropic) - ZDR orgs get `400 invalid_request_error`, as on Claude Fable 5. No Priority Tier; shares the Fable 5.x rate-limit pool. See `shared/model-migration.md` -> Migrating to Claude Fable 5.1 from Claude Fable 5. - **Claude Fable 5** / **Claude Mythos 5** (`claude-fable-5` / `claude-mythos-5`) - the previous Fable / Mythos release: same tier, limits and per-token pricing as Claude Fable 5.1, which adds three breaking API changes over them (see above; cache reads here are $1/MTok rather than Claude Fable 5.1's $0.25); still served and selectable by id. Claude Mythos 5 ran no safety classifiers, so `stop_reason: "refusal"` does not occur on it. Prefer claude-fable-5-1 for new work. - **Claude Mythos 5.1** - The same model as Claude Fable 5.1 (same capabilities, limits, per-token pricing, API behavior - except it does not run the history-editing check), offered only to approved Project Glasswing customers; successor to Claude Mythos 5 (which itself succeeded the invitation-only `claude-mythos-preview`). Unlike Claude Mythos 5 it runs safeguards that depend on the access program, so handle `stop_reason: "refusal"`. Not offered on Claude Platform on AWS. Use it only when the org participates in Project Glasswing; otherwise use `claude-fable-5-1`. - **Claude Opus 5.5** - Successor to Claude Opus 5 in the Opus line for long-running agentic coding and knowledge work, at a lower price ($4 / $20 per MTok; cache reads $0.20). Same 1M context, 128K output, tokenizer, and feature set as Claude Opus 5, with four breaking changes: thinking can't be disabled (effort is the only control, default `medium`), forced `tool_choice` 400s, thinking blocks are tied to the model and the conversation, and computer use needs the `computer_toolset_20260801` toolset. Broader safety classifiers (`bio` joins `cyber` and `reasoning_extraction`). The current Opus and the default model; see `shared/model-migration.md` -> Migrating to Claude Opus 5.5. - **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 5.1 (Claude Fable 5.1 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. - **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. - **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. - **Claude Opus 4.6** - Older Opus. Supports adaptive thinking (recommended), 128K max output tokens (requires streaming for large outputs). 1M context window. - **Claude Sonnet 5** - The previous Sonnet; 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. - **Claude Sonnet 5.5** - Successor to Claude Sonnet 5 in the Sonnet line, at the same prices ($2 / $10 per MTok; cache reads $0.20). Same tokenizer as Claude Sonnet 5; 1M context, 128K max output. Adaptive thinking on by default; effort default `high`, with recalibrated levels. Five breaking changes: `thinking: {type: "disabled"}` returns a 400 (send `{type: "between_tools"}` at effort `high` or below to turn thinking off), forced `tool_choice` 400s, thinking blocks are tied to the model and the conversation, computer use on the Claude API and Google Cloud needs the `computer_toolset_20260801` toolset, and the advisor tool rejects Claude Opus 4.8, Claude Opus 4.7, and Claude Sonnet 5 advisors. See `shared/model-migration.md` -> Migrating to Claude Sonnet 5.5. - **Claude Sonnet 4.6** - Previous-generation Sonnet. Supports adaptive thinking (recommended). 1M context window. 128K max output tokens. - **Claude Haiku 5.5** - The current Haiku and the default when the user asks for Haiku: the fast, low-cost model for high-volume, latency-sensitive work such as classification, routing, extraction, and sub-agent tasks. Successor to Claude Haiku 4.5 with a 1M context window and 128K max output, at $0.10 / $0.50 per MTok when the prompt is 100K tokens or fewer and $0.50 / $2.50 above that. Adaptive thinking only, on by default (`{type: "disabled"}` is accepted at effort `high` or below); `effort` from `low` through `max`, default `medium`. Breaking for code written for Claude Haiku 4.5: `budget_tokens`, non-default sampling parameters, and assistant prefill return a 400, on the Claude API and Google Cloud computer use needs the `computer_toolset_20260801` toolset, and editing earlier turns invalidates replayed thinking blocks (preserved thinking). Thinking text is omitted by default (`display: "summarized"` to see summaries). A newer tokenizer counts the same text as about 30% more tokens. Safety classifiers can return `stop_reason: "refusal"`, and there is no server-side fallback for this model. See `shared/model-migration.md` -> Migrating to Claude Haiku 5.5. - **Claude Haiku 4.5** - Previous-generation Haiku, still served. 200K context window, 64K max output, manual extended thinking with `budget_tokens`, no `effort` parameter. ## Legacy Models (still active) | Friendly Name | Alias (use this) | Full ID | Status | |-------------------|---------------------|-------------------------------|--------| | Claude Opus 4.5 | `claude-opus-4-5` | `claude-opus-4-5-20251101` | Active | | Claude Opus 4.1 | `claude-opus-4-1` | `claude-opus-4-1-20250805` | Deprecated (retires 2026-08-05 - migrate to `claude-opus-5-5`) | | Claude Sonnet 4.5 | `claude-sonnet-4-5` | `claude-sonnet-4-5-20250929` | Active | ## Deprecated Models (retiring soon) | Friendly Name | Alias (use this) | Full ID | Status | Retires | |-------------------|---------------------|-------------------------------|------------|--------------| | Claude Sonnet 4 | `claude-sonnet-4-0` | `claude-sonnet-4-20250514` | Deprecated | TBD | | Claude Opus 4 | `claude-opus-4-0` | `claude-opus-4-20250514` | Deprecated | TBD | | Claude Haiku 3 | - | `claude-3-haiku-20240307` | Deprecated | Apr 19, 2026 | ## Retired Models (no longer available) | Friendly Name | Full ID | Retired | |-------------------|-------------------------------|-------------| | Claude Sonnet 3.7 | `claude-3-7-sonnet-20250219` | Feb 19, 2026 | | Claude Haiku 3.5 | `claude-3-5-haiku-20241022` | Feb 19, 2026 | | Claude Opus 3 | `claude-3-opus-20240229` | Jan 5, 2026 | | Claude Sonnet 3.5 | `claude-3-5-sonnet-20241022` | Oct 28, 2025 | | Claude Sonnet 3.5 | `claude-3-5-sonnet-20240620` | Oct 28, 2025 | | Claude Sonnet 3 | `claude-3-sonnet-20240229` | Jul 21, 2025 | | Claude 2.1 | `claude-2.1` | Jul 21, 2025 | | Claude 2.0 | `claude-2.0` | Jul 21, 2025 | ## Resolving User Requests When a user asks for a model by name, use this table to find the correct model ID: | User says... | Use this model ID | |-------------------------------------------|--------------------------------| | "fable", "most capable model" | `claude-fable-5-1` | | "most powerful" | `claude-fable-5-1` | | "mythos", "mythos 5.1" | `claude-mythos-5-1` (Project Glasswing participants only; otherwise use `claude-fable-5-1`) | | "fable 5", "mythos 5" (previous version) | `claude-fable-5` / `claude-mythos-5` (still served; prefer `claude-fable-5-1` for new work) | | "mythos preview" | `claude-mythos-5-1` (successor to `claude-mythos-preview` - see migration guide) | | "opus" | `claude-opus-5-5` | | "opus 5" | `claude-opus-5` | | "opus 5.5" | `claude-opus-5-5` | | "opus 4.8" | `claude-opus-4-8` | | "opus 4.7" | `claude-opus-4-7` | | "opus 4.6" | `claude-opus-4-6` | | "opus 4.5" | `claude-opus-4-5` | | "opus 4.1" | `claude-opus-4-1` (deprecated, retires 2026-08-05 - suggest `claude-opus-5-5`) | | "opus 4", "opus 4.0" | `claude-opus-4-0` (deprecated - suggest `claude-opus-5-5`) | | "sonnet", "balanced" | `claude-sonnet-5-5` | | "sonnet 5" | `claude-sonnet-5` | | "sonnet 5.5" | `claude-sonnet-5-5` | | "cheapest sonnet", "newest sonnet", "latest sonnet" (any attribute phrasing) | `claude-sonnet-5-5` | | "sonnet 4.6" | `claude-sonnet-4-6` | | "sonnet 4.5" | `claude-sonnet-4-5` | | "sonnet 4", "sonnet 4.0" | `claude-sonnet-4-0` (deprecated - suggest `claude-sonnet-5-5`) | | "sonnet 3.7" | Retired - suggest `claude-sonnet-5-5` | | "sonnet 3.5" | Retired - suggest `claude-sonnet-5-5` | | "haiku", "fast", "cheap" | `claude-haiku-5-5` | | "haiku 5.5" | `claude-haiku-5-5` | | "newest haiku", "latest haiku" (any attribute phrasing) | `claude-haiku-5-5` | | "haiku 4.5" | `claude-haiku-4-5` | | "haiku 3.5" | Retired - suggest `claude-haiku-5-5` | | "haiku 3" | Deprecated - suggest `claude-haiku-5-5` | ```` ## Verified Execution Output / Benchmark ```text Verified execution output available on the canonical page. ``` ## Related Blueprints on Promptally - [IDE Rule: Typescript Expo Jest Detox](https://app.promptally.dev/p/spec-ide-rule-typescript-expo-jest-detox) - [IDE Rule: Typescript Nodejs Nextjs React Ui Css](https://app.promptally.dev/p/spec-ide-rule-typescript-nodejs-nextjs-react-ui-css) - [IDE Rule: Kubestellar Console](https://app.promptally.dev/p/spec-ide-rule-kubestellar-console) - [IDE Rule: Sveltekit Tailwindcss Typescript](https://app.promptally.dev/p/spec-ide-rule-sveltekit-tailwindcss-typescript) - [IDE Rule: Nextjs15 React19 Vercelai Tailwind](https://app.promptally.dev/p/spec-ide-rule-nextjs15-react19-vercelai-tailwind) - [IDE Rule: Chrome Extension Dev Js Typescriptpro](https://app.promptally.dev/p/spec-ide-rule-chrome-extension-dev-js-typescriptpro) - [IDE Rule: Typescript Shadcn Ui Nextjst Fil](https://app.promptally.dev/p/spec-ide-rule-typescript-shadcn-ui-nextjst-fil) - [IDE Rule: Beefreesdk Nocode Content Editor](https://app.promptally.dev/p/spec-ide-rule-beefreesdk-nocode-content-editor)