Claude Opus 4.5

Q: What is the API model name for Claude Opus 4.5?

Use claude-opus-4-5 in API calls to Anthropic. The context window is 200K tokens, and a response can run to 64,000 output tokens.

Claude Opus 4.5 API pricing is $5 per million input tokens and $25 per million output tokens.

Provider: Anthropic
API model name: claude-opus-4-5
Status: Older
Input, $ per 1M tokens: $5.00
Cached input, $ per 1M tokens: $0.50
Output, $ per 1M tokens: $25.00
Sample request (10K in, 2K out), $: $0.10
Context window, tokens: 200K
Price checked on: October 31, 2026
Official pricing page: platform.claude.com

These are standard rates on Anthropic’s own API. Cached input is billed at $0.50 per million tokens. A request with 10,000 input tokens and 2,000 output tokens costs about $0.10 before caching or batch discounts. The API model name is claude-opus-4-5, and the context window is 200K tokens. Claude Opus 4.6 has the same prices with a 1M-token context window, and Anthropic’s current Claude Opus 5.5 runs the same request for about $0.08.

Cache writes cost $6.25 per 1M tokens for a 5-minute cache and $10 for a 1-hour cache.

Cache writes, $ per 1M tokens: $6.25
Max output, tokens: 64K
Input types: Text, image
Open weights: No
Batch pricing: 50% off input and output tokens
Pricing notes: Cache writes cost $6.25 per 1M tokens for a 5-minute cache and $10 for a 1-hour cache. Anthropic lists retirement not sooner than November 24, 2026.
Sources: Page URL Checked
Claude API pricing https://platform.claude.com/docs/en/about-claude/pricing 2026-10-19
Claude Opus 4.5 model page (context and output limits) https://platform.claude.com/docs/en/models/opus-4-5/overview 2026-10-04

Page	URL	Checked
Claude API pricing	https://platform.claude.com/docs/en/about-claude/pricing	2026-10-19
Claude Opus 4.5 model page (context and output limits)	https://platform.claude.com/docs/en/models/opus-4-5/overview	2026-10-04

Questions

How much does the Claude Opus 4.5 API cost?

Claude Opus 4.5 costs $5 per million input tokens and $25 per million output tokens on Anthropic’s own API. Cached input costs $0.50 per million tokens.

What is the API model name for Claude Opus 4.5?

Use claude-opus-4-5 in API calls to Anthropic. The context window is 200K tokens, and a response can run to 64,000 output tokens.

What does one Claude Opus 4.5 request cost?

A request with 10,000 input tokens and 2,000 output tokens costs about $0.10 at standard rates, before caching or batch discounts. Batch requests get 50% off input and output tokens.

Is Claude Opus 4.5 still available?

Yes. Anthropic lists it as an active legacy model, with retirement not sooner than November 24, 2026.

Sources

Prices are read from each provider’s official pricing page: OpenAI, Anthropic, Google Gemini API, xAI, DeepSeek and Mistral AI. Context and output limits that a provider does not publish come from OpenRouter’s model listing. Each model’s Sources field lists the pages used and the date each was checked. How we check prices · Price change log