Claude APIPaid
Anthropic's AI models via API — excel at long documents, careful reasoning, and following complex instructions.
AI / LLM comparison
Claude API vs OpenAI AgentKit
Pricing, pros, cons, and ideal use cases — side by side.
OpenAI AgentKitFreemium
OpenAI first-party agent toolkit — a visual Agent Builder, embeddable ChatKit UI, a connector registry, and evals, billed at plain API rates.
At a glance
| Claude API | OpenAI AgentKit | |
|---|---|---|
| Pricing | PaidPay-as-you-go. Claude Sonnet roughly $3/1M input tokens. Very competitive pricing. | FreemiumNo separate platform fee. Agent Builder design is free; you pay standard OpenAI API model and storage rates for execution. As a reference point, GPT-5.2 runs roughly $1.75 per million input tokens and $14 per million output tokens, with GPT-5 mini at about $0.25 per million input tokens. |
| Category | AI / LLM | AI / LLM |
| Ideal for | Law FirmsAgenciesAccountantsAny SMB wanting AI features | Product teams embedding agents into their own softwareEngineering teams already building on the OpenAI APIStartups that want agent scaffolding without a platform feeTeams standardizing evals alongside agent development |
Pros & cons
Claude API
Pros
- Excellent at long documents
- Strong instruction following
- Great for legal/compliance
- Competitive pricing
Cons
- Requires technical setup
- Smaller ecosystem than OpenAI
- Newer platform
OpenAI AgentKit
Pros
- No platform fee on top of API usage
- Visual workflow builder with versioning
- ChatKit ships a production-ready chat UI
- Evals are first-class rather than an afterthought
- Cost model is the API cost model you already forecast
Cons
- Single-provider lock-in at the orchestration layer
- Agent Builder and Connector Registry have been in beta rather than fully GA
- Fewer enterprise governance controls than Copilot Studio or Agentforce
- No managed hosting story comparable to Bedrock AgentCore
Which should you choose?
OpenAI AgentKit is the lighter-weight option (Freemium), while Claude API sits higher on the pricing ladder (Paid). Claude API is built around law firms; OpenAI AgentKit leans more toward product teams embedding agents into their own software. Shortlist the one whose strengths line up with your biggest constraint.