Sonnet 4.5. Released yesterday. Now live on DATS-4 SQL Agent Suite. Solid upgrade, but more 4.2 than 4.5.
Published: October 12, 2025
PDF Report Available at Database AI
Quality: Sonnet 4 was already the best. 4.5 is clearly better, but not by a big margin.
Cost: Same as Sonnet 4.
Assessment: Initial assessment based on quick tests (see below/ docs). More to follow as I use it live.
Scope: Reasoning based advanced analysis in multi-step multi-agent setup.
Quality Scores
- Claude Sonnet 4.5: 115
- Claude Sonnet 4: 100
- GPT-5: 95
- Qwen3 Max: 90
- DeepSeek R1: 85
- Gemini 2.5 Flash: 75
Cost
Reasoning & planning cost for advanced analysis task in USD per 100 questions. Execution cost extra. See next paragraph / doc for details.
- Claude Sonnet 4.5: $6.5
- Claude Sonnet 4: $6.5
- GPT-5: $15.0
- Qwen3 Max: $2.0
- DeepSeek R1: $2.25
- Gemini 2.5 Flash: $1.75
In multi-step advanced analysis, execution is the biggest chunk
In DATS-4 I use GPT-4.1 for execution at about $10 per 100 questions. A single-step SQL agent is much cheaper (GPT-4.1 = $2 per 100, 4.1-mini = $0.50, 4o-mini = $0.25).
My recommendation: use single-step wherever possible
In my own live usage, approx. 80% of work runs through single-step agents. Multi-step - reserve for the tough analysis cases.
Task Examples (tested live)
- Credit card data mart build (1M customers, 10M transactions, AWS RDS MySQL).
- Weighted score ranking of Indian issuers (RBI monthly file, Supabase).
DATS-4
Full-stack Database SQL multi-agent: text-to-SQL, Python charts, stats, instant Postgres DB, PDF outputs, 9 reasoning models.
Live App (free)
All credentials and API calls pass through my backend server. Free to test. For live use, deploy on your VPN.
Docs and source: open, full code at app site.
