Claude Sonnet 4.5

claude-sonnet-4-5 · Anthropic

Sonnet 4.5 is the best model in the world for agents, coding, and computer usage. It is also our most accurate and detailed model for long-running tasks, with enhanced knowledge in coding, finance, and cybersecurity. This model supports a thinking parameter to enable thinking requests in Claude mode.

API Pricing

Input$3.3 / 1M tokens
Output$16.5 / 1M tokens

Specifications

Context200K tokens
Modalitiestext, image, PDF
CapabilitiesThinking, Streaming, Tool calling, Code interpreter, Computer use, Memory tool, Structured outputs, Citations, Prompt caching

Frequently asked questions

What is Claude Sonnet 4.5?

Sonnet 4.5 is the best model in the world for agents, coding, and computer usage. It is also our most accurate and detailed model for long-running tasks, with enhanced knowledge in coding, finance, and cybersecurity. This model supports a thinking parameter to enable thinking requests in Claude mode.

What is the context length of Claude Sonnet 4.5?

Claude Sonnet 4.5 has a 200,000 token context window.

How much does Claude Sonnet 4.5 cost?

On AIHubMix, Claude Sonnet 4.5 costs $3.3 per million input tokens and $16.5 per million output tokens.

What modalities does Claude Sonnet 4.5 support?

Claude Sonnet 4.5 accepts text, image and PDF input.

What capabilities does Claude Sonnet 4.5 support?

Claude Sonnet 4.5 supports thinking, tool calling, function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.

How do I call Claude Sonnet 4.5 via API?

Claude Sonnet 4.5 is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to claude-sonnet-4-5 — no other code changes needed.

Who created Claude Sonnet 4.5?

Claude Sonnet 4.5 is developed by Anthropic. AIHubMix aggregates it alongside models from other providers behind one API and one bill.

When was Claude Sonnet 4.5 released?

Claude Sonnet 4.5 was released on September 29, 2025 by Anthropic.

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Use Claude Sonnet 4.5 via the AIHubMix unified API — one interface for every major LLM.