Anthropic

Claude is Anthropic's AI model, ChatGPT is OpenAI's consumer product. Both use large language models but differ in training methodology (Constitutional AI vs RLHF), context window (Claude: 200K tokens vs GPT-4o: 128K), and design philosophy (Claude prioritizes safety and accuracy). For developers, the relevant comparison is Claude API vs OpenAI API — both provide programmatic access to their respective models.

Yes. Anthropic's startup credit program accepts bootstrapped and self-funded startups. The requirement is a demonstrable AI-powered product or prototype, not a funding round. Solo developers and pre-revenue startups are eligible.

Claude Sonnet is the default recommendation — best balance of quality and cost. Use Opus for complex reasoning, long document analysis, and tasks where accuracy is critical. Use Haiku for high-volume, low-complexity tasks like classification, extraction, and simple Q&A where speed and cost matter more than maximum quality.

Credits typically last 12 months from activation or until exhausted. At typical early-stage usage ($300–$600/month in API calls), $2,000 covers 3–6 months of development and production usage. Using Haiku for development and caching for production extends credits significantly.

Yes. Many startups use both APIs — routing different tasks to whichever model performs better. Use Claude for long-document analysis (200K context) and OpenAI for image generation (DALL-E) or speech-to-text (Whisper). The APIs are independent and complementary.

Yes. Claude supports tool use — defining external functions that Claude can call based on natural language instructions. This enables building AI agents that query databases, call APIs, execute code, and perform multi-step workflows. Tool use is available on all Claude model tiers.