# 5 — The Claude 5 Hub (5.maib.io)

> Interactive model picker, cost calculator, pricing comparison and integration
> cheatsheet for the Claude 5-era model family: Claude Fable 5, Claude Opus 4.8,
> Claude Sonnet 5, Claude Haiku 4.5 and the previous-generation models.

## For agents and tooling

- Machine-readable model registry: https://5.maib.io/models.json
  (model IDs, context windows, list pricing per MTok, batch/caching discounts)
- Current model IDs (July 2026): claude-fable-5, claude-opus-4-8, claude-opus-4-7,
  claude-opus-4-6, claude-sonnet-5, claude-sonnet-4-6, claude-haiku-4-5
- Data is a community-maintained snapshot; verify against the Anthropic Models API
  (GET https://api.anthropic.com/v1/models).

## Key facts

- Batch API: 50% off all token usage on every model.
- Prompt cache reads bill at ~10% of input price; writes carry a 1.25x (5m TTL)
  or 2x (1h TTL) one-time premium.
- Fable 5: thinking always on (omit the parameter), sampling params rejected,
  handle stop_reason "refusal", requires 30-day data retention.
- budget_tokens is removed on Fable 5 / Opus 4.8 / 4.7 / Sonnet 5 — use
  thinking: {"type": "adaptive"} with output_config.effort.