claude-api-ops

# Claude API Operations Building applications and agents on Anthropic's API: the Messages API, tool use, prompt caching, structured outputs, batches, thinking/effort, and the Claude Agent SDK. For developers writing apps *against* the API — not for using Claude Code itself. **API surfaces move fast.** Model IDs, parameters, and betas in this skill were verified against platform.claude.com (2026-08). When in doubt — especially for "latest model" or pricing questions — verify with WebFetch against `https://platform.claude.com/docs/en/about-claude/models/overview.md` or query the Models API (`client.models.list()`). ## Current Models (verified 2026-08) | Model | ID (exact, no date suffix) | Context | Max Output | Input $/MTok | Output $/MTok | |---|---|---|---|---|---| | Claude Fable 5 | `claude-fable-5` | 1M | 128K | $10.00 | $50.00 | | Claude Opus 5 | `claude-opus-5` | 1M | 128K | $5.00 | $25.00 | | Claude Sonnet 5 | `claude-sonnet-5` | 1M | 128K | $2.00 | $10.00 | | Claude Haiku 4.5 | `claude-haiku-4-5` | 200K | 64K | $1.00 | $5.00 | Use these alias IDs verbatim. **Never append date suffixes** (`claude-sonnet-5-20260630` is wrong → 404). Haiku 4.5 is the one current model with a *dated* snapshot id (`claude-haiku-4-5-20251001`) behind its alias; from the 4.6 generation on, the dateless id **is** the pinned snapshot. **Legacy (still available, no longer current):** `claude-opus-4-8`, `claude-opus-4-7`, `claude-opus-4-6`, `claude-opus-4-5`, `claude-sonnet-4-6`, `claude-so...