Claude is Anthropic's model family trained with Constitutional AI (CAI) for safety. Claude 3.7 Sonnet (Feb 2025) is the current flagship with extended thinking mode, 200k context window, and $3/$15 per million tokens. Claude Haiku 3.5 is the economy tier at $0.25/$1.25. Claude excels at long document analysis, coding (top SWE-bench scores), and nuanced instruction following. The Messages API is compatible with the OpenAI SDK structure.
Each stage in order — click any step to read what it does.
Claude models by use case and cost tier.
The trade-offs worth knowing before you build this.
Claude models are exceptional at following complex multi-constraint instructions — maintaining format, tone, persona, and content rules simultaneously. For tasks requiring strict output adherence, Claude often outperforms GPT-4o.
Claude 3.7 Sonnet with extended thinking holds top positions on SWE-bench (real GitHub issue resolution) and AIME math competitions. For hard coding problems, enable thinking with budget_tokens: 8000+.
If you have a constant large document (code file, knowledge base, long system prompt) that you send with every request, Anthropic's prompt caching drops that context cost by 90%. Cache TTL=5 minutes.
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