Anthropic's Opus-tier model announced on November 24, 2025, introducing the effort parameter for balancing capability against cost, context compaction, and a deeper memory tool. Available across the Anthropic API, Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry.
QUICK FACTS
WHY WE PICKED IT
Opus 4.5 was the first Claude model to ship the effort parameter, an important capability evolution before Opus 4.6 and 4.7.
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PRICING
Enterprise pricing — contact Claude Opus 4.5 for a custom quote and contract terms.
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FREQUENTLY ASKED QUESTIONS
Is Claude Opus 4.5 free?
Claude Opus 4.5 is offered as an enterprise solution; contact the provider for pricing.
Does Claude Opus 4.5 have an API?
Yes, Claude Opus 4.5 offers an API for programmatic integration.
What is Claude Opus 4.5 best for?
Claude Opus 4.5 is best for Best for Cost-Capability Tradeoffs. Anthropic's Opus-tier model announced on November 24, 2025, introducing the effort parameter for balancing capability against cost, context compaction, and a deeper memory tool. Opus 4.5 was the first Claude model to ship the effort parameter, an important capability evolution before Opus 4.6 and 4.7.
What platforms does Claude Opus 4.5 support?
Claude Opus 4.5 supports web, api.
Is Claude Opus 4.5 open source?
No, Claude Opus 4.5 is not open source.
How do I use Claude Opus 4.5?
Claude Opus 4.5 is a large language model for text generation, analysis, and conversation. Access through the web interface. Enter prompts or questions to get responses.
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