Anthropic API: full anthropic-ratelimit-* header set, Evaluation/Start/Build/Scale/Custom tiers, 429 rate_limit_error vs 529 overloaded_error (docs, 2026-11-03)

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Source: Claude API docs — Rate limits (`platform.claude.com/docs/en/api/rate-limits`, redirected from `docs.anthropic.com/en/api/rate-limits`), Errors (`platform.claude.com/docs/en/api/errors`), and Model deprecations (`platform.claude.com/docs/en/about-claude/model-deprecations`). Fetched live 2026-11-03.

## Rate-limit response headers (documented, returned on every response)
`retry-after`, `anthropic-ratelimit-requests-limit/-remaining/-reset`, `anthropic-ratelimit-tokens-limit/-remaining/-reset` (combined input+output, shows whichever limit is most restrictive), `anthropic-ratelimit-input-tokens-limit/-remaining/-reset`, `anthropic-ratelimit-output-tokens-limit/-remaining/-reset`, plus Priority-Tier-only `anthropic-priority-input-tokens-*` and `anthropic-priority-output-tokens-*`. `-remaining` values are rounded to the nearest thousand for tokens. `retry-after` is NOT sent on every 429: a monthly-spend-cap 429 omits it and keeps failing until the next UTC month regardless of retry — the doc calls this out explicitly as a trap for naive retry loops, including the SDK's own automatic retry.

## Usage tiers
Organizations start in an **Evaluation** tier (below-standard limits while usage history builds), then move automatically to **Start** ($500/mo spend cap) -> **Build** ($1,000/mo) -> **Scale** ($200,000/mo) -> **Custom** (no cap, negotiated). Example Start-tier RPM/ITPM/OTPM for Claude Sonnet 5: 1,000 RPM / 2,000,000 ITPM / 400,000 OTPM; Scale-tier same model: 10,000 RPM / 10,000,000 ITPM / 2,000,000 OTPM. Limits use a token-bucket algorithm (continuous replenishment, not fixed-interval reset). `cache_read_input_tokens` do NOT count toward ITPM on most models (prompt caching raises effective throughput without raising the limit) — an explicit named exception for Claude Haiku 3.5, which does count cached reads toward ITPM.

## 429 vs 529 — two different failure modes, not one
- **429 `rate_limit_error`**: a per-organization rate limit, the monthly spend cap, or (narrowly) a Claude Code workspace spend limit.
- **529 `overloaded_error`**: "The API is temporarily overloaded" under high traffic **across all users** — a capacity signal, not an account-specific quota. Distinct status code, not folded into 429.
- A third related 429 cause: "acceleration limits" — a sharp usage increase can trigger 429s even under the organization's nominal rate limit; the documented fix is to ramp traffic gradually, not retry harder.

## Deprecation notices
A dedicated page (URL above) with a status column and tentative retirement dates; Anthropic's documented minimum notice is "at least 60 days" for publicly released models with active deployments.

How observed: 2026-11-03T11:48Z, documentation fetch of the three pages above (live header/tier/error tables are account-specific and require a real API key to observe as traffic; recorded from current published docs).

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