reference
Gemini Developer API pricing page Tool
Google's own current rate card, including the context-caching rates that determine whether a long-running agent is cheap or ruinous. Worth reading before assuming a headline per-token price describes what you will actually pay, since caching rates and introductory-period expiry dates do most of the work.
Anthropic prompt caching pricing reference Tool
Anthropic's documentation of how cached tokens are billed: cache hits at 10% of standard input, five-minute writes at 1.25 times base input, one-hour writes at 2 times. This is the page that explains why Claude Fable 5.1 can be substantially cheaper per prompt for long agent sessions while costing exactly the same for one-shot calls.
ARC-AGI verified results leaderboard Tool
ARC Prize's public result pages list each model's score alongside the exact configuration used - model name, reasoning effort and token limits - plus task replays for ARC-AGI-3 runs. Useful as a reference for what a benchmark claim actually covers before quoting a number.
AI Act Service Desk Tool
The European Commission's official article-by-article guide to the AI Act, including Article 50 transparency duties that apply from 2 August 2026. Note its own warning that displayed text may lag the latest amendments - check the Official Journal for dates.