A agentindex
Comparison

Anthropic vs OpenAI

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Anthropic

The Claude model API.

  • + Top-tier coding and reasoning models
  • + Very large context windows
  • − Proprietary, usage-based pricing
  • − Claude-only

OpenAI

The GPT and Codex model API.

  • + Widest tooling and ecosystem support
  • + Consistent, well-documented API
  • − Proprietary, usage-based pricing adds up
  • − Vendor lock-in for GPT-only features
Spec Anthropic OpenAI
Role LLM provider LLM provider
Tags llm-provider llm-provider
License Proprietary Proprietary
Open source No No
Self-hostable No No
MCP support No No
Pricing usage usage
Price Per-token Per-token
Usage cost Metered Metered
Models claude gpt
Languages
GitHub stars — —
Last activity — —