LLMs & APIs comparison 
OpenAI API vs Anthropic API
Our pick: OpenAI API scores 9.5/10 against 9.5/10 for Anthropic API. Here's how they differ and which one fits your needs.
OpenAI API
API access to GPT models, reasoning, images, voice and agents
9.5/10PaidOur pick
Visit OpenAI API VS
At a glance
| OpenAI API | Anthropic API | |
|---|---|---|
| Our score | 9.5/10 | 9.5/10 |
| Best for | Developers, Startups, Enterprises | Developers, Enterprises |
| Type | Model providers | Model providers |
| Pricing | Paid | Paid |
| Starting price | See website | See website |
| Platforms | API | API |
| Launched | 2020 | 2023 |
Key features
OpenAI API
- GPT and reasoning models
- Responses API
- Realtime voice
- Image generation
- Agents SDK
Anthropic API
- Claude models
- Tool use
- Prompt caching
- Agent SDK
- Long context
OpenAI API: pros and cons
Pros
- Broadest ecosystem and documentation
- Strong multimodal capabilities
Cons
- Usage costs can grow quickly
- Model deprecations require upkeep
Anthropic API: pros and cons
Pros
- Top-tier coding and agentic performance
- Strong safety and reliability
Cons
- No image generation
- Premium models priced higher than some rivals
Verdict: OpenAI API or Anthropic API?
Choose OpenAI API if you're developers or startups or enterprises and value broadest ecosystem and documentation.
Choose Anthropic API if you're developers or enterprises and value top-tier coding and agentic performance.
Overall we rate OpenAI API slightly higher. Both are worth trying. See all LLMs & APIs tools for more options.
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