Provider
Anthropic on ModelServer
Anthropic builds the Claude family of large language models — known for nuanced reasoning, long context, strong instruction following, and a constitutional AI approach to safety.
All Anthropic models
Click any model to see full pricing, context window, code examples and FAQ.
Claude Opus 4
200KAnthropic's flagship reasoning model. Best for complex analysis, long-form writing, and agentic tasks.
Input
$15.00
Output
$75.00
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Claude Sonnet 4
200KBalanced quality and speed. The default Claude for production workloads.
Input
$3.00
Output
$15.00
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Claude Haiku 4.5
200KFastest Claude — sub-second latency for high-throughput applications.
Input
$1.00
Output
$5.00
Open →
Use Anthropic models with one ModelServer key.
Pay-as-you-go pricing, OpenAI-compatible API, automatic failover. No subscription, no monthly minimum.