What's the difference between Anthropic API and OpenAI API?

Both are venture-backed. Anthropic API has 0 curated indie alternatives in our directory; OpenAI API has 10.

Is Anthropic API cheaper than OpenAI API?

Anthropic API starts at Pay per token; OpenAI API starts at Pay per token.

Side-by-side

Anthropic API vs OpenAI API

Pricing, founders, indie status and curated alternatives compared from our directory — all data points sourced from each tool's public site or press materials.

Anthropic API

Claude models via API.

Paid · Pay per token

Visit Anthropic API ↗

OpenAI API

GPT and o1 models via API.

AI / LLM APIsPaid · Pay per token

Visit OpenAI API ↗

At a glanceAnthropic APIOpenAI API

Pricing: Pay per token; Pay per token
Pricing model: Paid; Paid
Founded: —; —
Location: —; —
Bootstrapped: —; —
Open source: —; —
Category: —; AI / LLM APIs
Indie alternatives: 0; 10
Founders: —; —

Key differences

Funding
Both are venture-backed.
Indie alternatives
Anthropic API has 0 curated indie alternatives in our directory; OpenAI API has 10.

Differences are derived directly from the data on each tool's page. Empty fields mean we haven't verified a value yet — never that one tool lacks the capability.

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