Claude Sonnet 4.5

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

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

Claude Sonnet 4.5 API pricing is $3 per million input tokens and $15 per million output tokens.

Provider: Anthropic
API model name: claude-sonnet-4-5
Status: Deprecated
Input, $ per 1M tokens: $3.00
Cached input, $ per 1M tokens: $0.30
Output, $ per 1M tokens: $15.00
Sample request (10K in, 2K out), $: $0.06
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. Anthropic deprecated the model on September 30, 2026, and it retires on November 30, 2026; the recommended replacement is claude-sonnet-5-5. Cached input is billed at $0.30 per million tokens. A request with 10,000 input tokens and 2,000 output tokens costs about $0.06 before caching or batch discounts. The API model name is claude-sonnet-4-5, and the context window is 200K tokens. Claude Sonnet 5.5 runs the same request for about $0.04 with a 1M-token context window.

Cache writes cost $3.75 per 1M tokens for a 5-minute cache and $6 for a 1-hour cache.

Cache writes, $ per 1M tokens: $3.75
Max output, tokens: 64K
Input types: Text, image
Open weights: No
Batch pricing: 50% off input and output tokens
Pricing notes: Anthropic deprecated claude-sonnet-4-5-20250929 on September 30, 2026 and will retire it on November 30, 2026. The recommended replacement is claude-sonnet-5-5. Cache writes cost $3.75 per 1M tokens for a 5-minute cache and $6 for a 1-hour cache.
Sources: Page URL Checked
Claude API pricing https://platform.claude.com/docs/en/about-claude/pricing 2026-10-19
Claude Sonnet 4.5 model page (context and output limits) https://platform.claude.com/docs/en/models/sonnet-4-5/overview 2026-10-04
Claude model deprecations https://platform.claude.com/docs/en/about-claude/model-deprecations 2026-10-19

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

Price changes for this model

Effective	Change	Was	Now	Official source
September 30, 2026	Deprecation	Active: $3 input, $0.30 cached input, $15 output per 1M tokens	Deprecated; claude-sonnet-4-5-20250929 retires November 30, 2026 (replacement: claude-sonnet-5-5 at $2 input, $10 output per 1M tokens)	platform.claude.com

Questions

How much does the Claude Sonnet 4.5 API cost?

Claude Sonnet 4.5 costs $3 per million input tokens and $15 per million output tokens on Anthropic’s own API. Cached input costs $0.30 per million tokens.

What is the API model name for Claude Sonnet 4.5?

Use claude-sonnet-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 Sonnet 4.5 request cost?

A request with 10,000 input tokens and 2,000 output tokens costs about $0.06 at standard rates, before caching or batch discounts. Batch requests get 50% off input and output tokens.

Is Claude Sonnet 4.5 still available?

Anthropic deprecated claude-sonnet-4-5-20250929 on September 30, 2026 and retires it on November 30, 2026. The recommended replacement is claude-sonnet-5-5.

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