# claude-sonnet-4-20250514 Projects at AI Tinkerers

> Canonical HTML: https://aitinkerers.org/technologies/claude-sonnet-4-20250514
> Markdown URL: https://aitinkerers.org/technologies/claude-sonnet-4-20250514.md
> Technology record last updated: 2026-03-24T09:25:05Z
> Generated: 2026-09-22T08:37:19Z

Anthropic's mid-tier powerhouse balancing elite reasoning speeds with a 200k context window for enterprise-grade automation.

Claude 4 Sonnet (version 20250514) hits the sweet spot between raw intelligence and operational efficiency. It delivers a 2x speed increase over the previous 3.5 iteration while maintaining a sub-second Time To First Token (TTFT). This model excels at complex data extraction, multi-step tool use, and high-accuracy coding tasks across 20+ programming languages. By leveraging a refined training set, it minimizes hallucinations in long-form document analysis (up to 500 pages) and provides the reliable performance required for autonomous agent workflows.

- Official technology site: https://www.anthropic.com/news/claude-4-sonnet
- Public AI Tinkerers demos and talks: 1
- Result page: 1 of 1

## Recent Public Talks and Demos

### [Domain-encoded system prompts: turning 15 years of accounting forensics into a live Claude diagnostic tool](https://montreal.aitinkerers.org/talks/rsvp_x6xfCYXZsaM)

I built a structured diagnostic engine that ingests raw ADP Workforce Now payroll exports and NetSuite GL data, routes them through a domain-encoded Claude system prompt, and returns a JSON-structured root cause analysis — including the specific fix — for recurring payroll-GL discrepancies that human reviewers consistently miss. The demo runs live against the Anthropic Messages API. The input is a real payroll pattern: employer burden accounts (CPP, EI, CNESST, RQAP) posting at exactly 0.500x expected in every quarter-end month for three years. The system prompt carries the diagnostic heuristics — check ratio before amount, look for N-period calendar patterns, separate gross wages from employer burden — that normally live inside a practitioner's head. Claude doesn't discover these rules. They're injected. The output is a structured JSON object with root_cause, confidence_pct, adp_fix_steps[], correcting_je_description, and cfo_memo.

- Event context: AI Tinkerers Montreal - March Demo Night — 2026-03-24 — Montreal
- Public talk page: https://montreal.aitinkerers.org/talks/rsvp_x6xfCYXZsaM

## Related Technologies

- [ADP Workforce Now](https://aitinkerers.org/technologies/adp-workforce-now) ([Markdown](https://aitinkerers.org/technologies/adp-workforce-now.md)) — 1 public demo
- [Anthropic Messages API](https://aitinkerers.org/technologies/anthropic-messages-api) ([Markdown](https://aitinkerers.org/technologies/anthropic-messages-api.md)) — 2 public demos
- [JavaScript](https://aitinkerers.org/technologies/javascript) ([Markdown](https://aitinkerers.org/technologies/javascript.md)) — 40 public demos
- [JSON](https://aitinkerers.org/technologies/json) ([Markdown](https://aitinkerers.org/technologies/json.md)) — 20 public demos