Release dates
— Claude Sonnet 4.5 launched. ↗
Claude Sonnet 4.5
Strengthened long-running coding, computer use, and complex agents alongside the Claude Agent SDK.
MODEL NUMBER074
- First public date
- 2025-09-29
- Organization
- Anthropic
- Family
- Claude
01
Specifications
Only published specifications are shown.
- Context
- 200,000 tokens
- Input modalities
- Text · Image
- Open weights
- No
- Status
- Legacy
02
Overview
PreviousClaude Sonnet 4— · 200K ctx
CurrentClaude Sonnet 4.5— · 200K ctx
04
Architecture & capabilities
Model capabilities
Long-horizon agentCoding
Connected tools
Computer use
Product features
Memory
05
Release history
Claude Sonnet 4.5 launched.
View source06
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07
Sources
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