Claude Sonnet 4.5

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-ben

Creator: Anthropic
Lifecycle: Active
Context: 1.0M
Max output: 64.0K
Released: Sep 29, 2025
Status: up

Input: $3.00 / 1M tokens
Output: $15.00 / 1M tokens
Cached read: $0.30 / 1M tokens
Cached write: — / 1M tokens
Batch discount: —%
Source: OpenRouter
Verified: Apr 5, 2026 (High)

Capabilities

Modalities: textimagefile→text
Capabilities: reasoningimageInputpromptCachingfunctionCallingstructuredOutputs

Official Links

Intro

https://openrouter.ai/anthropic/claude-sonnet-4.5

Docs

https://openrouter.ai/anthropic/claude-sonnet-4.5

Pricing

https://openrouter.ai/models

Benchmark Coverage

Benchmark	Version	Score	Date	Source	Notes

Release History

Release	Alias	Lifecycle	Release Date	Deprecation	Shutdown	Summary
Claude Sonnet 4.5	anthropic-claude-sonnet-4-5	Active	Sep 29, 2025	—	—	Model available via OpenRouter.

Host Coverage

Host	Type	Context	Pricing Note	Differences
OpenRouter	aggregator	1.0M	$3.00/1M in · $15.00/1M out via OpenRouter	—

Migration Guidance

Change Events

Date	Type	Title	Description	Source
Sep 29, 2025	family_added	Claude Sonnet 4.5 published	Model made available via OpenRouter.	OpenRouter

Other models from Anthropic

Claude 3 Haiku, Claude 3 Opus, Claude 3.5 Haiku, Claude 3.5 Sonnet, Claude 3.7 Sonnet, Claude 3.7 Sonnet (thinking), Claude Haiku 4.5, Claude Opus 4, Claude Opus 4, Claude Opus 4.1, Claude Opus 4.5, Claude Opus 4.6, Claude Sonnet 4, Claude Sonnet 4, Claude Sonnet 4.6