How do you use Claude Opus 4.5?

Claude Opus 4.5 can be called through OpenRouter's OpenAI-compatible API using the model ID anthropic/claude-opus-4.5. This page includes a ready-to-run curl example and the supported parameter list.

Is Claude Opus 4.5 free?

Claude Opus 4.5 is a paid model in the OpenRouter catalog, with separate input and output token pricing shown on this page.

Claude Opus 4.5

All models

AnthropicClaude Moderated

Claude Opus 4.5

Q: What is Claude Opus 4.5?

Claude Opus 4.5 is an AI model from Anthropic in the Claude series. Agent Mag tracks its context window, pricing, modalities, and supported API parameters on this page.

200K context

$5.00/M input

$25.00/M output

Claude Opus 4.5 is an AI model from Anthropic built for agent workflows, with support for file, image, text input and text output. Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and...

What is Claude Opus 4.5?

Claude Opus 4.5 is an AI model from Anthropic that Agent Mag tracks for pricing, context window, modalities, benchmarks, and API compatibility. Builders can use this page to compare Claude Opus 4.5 against other models for agent workflows and production deployments.

Model ID

Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and...

Modalities

Input

fileimagetext

Output

text

Supported Parameters

include_reasoningmax_tokensreasoningresponse_formatstopstructured_outputstemperaturetool_choicetoolstop_kverbosity

More from Anthropic

Claude Opus Latest

1M ctx$5.00/M

This model always redirects to the latest model in the Claude Opus family.

Claude Opus 4.7

1M ctx$5.00/M

Opus 4.7 is the next generation of Anthropic's Opus family, built for long-running, asynchronous agents. Building on the coding and agentic strengths of Opus 4.6, it delivers stronger performance on...

Claude Opus 4.6 (Fast)

1M ctx$30.00/M

Fast-mode variant of [Opus 4.6](/anthropic/claude-opus-4.6) - identical capabilities with higher output speed at premium 6x pricing. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

Claude Sonnet 4.6

1M ctx$3.00/M

Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with...

Stay in the know

Claude Opus 4.5

What is Claude Opus 4.5?

More from Anthropic

Related content