Claude Sonnet 4.8 is a foundation model developed by Anthropic. It is a large language model designed for chat, featuring an exceptionally long context window of 1000K.
Parameters
Undisclosed
Context Window
1000K
License
Proprietary
Release Date
2026-05-31
API Pricing
API pricing for this model is not yet available
Strengths
- ・Handles extremely long contexts
- ・Advanced chat dialogue performance
- ・Latest design from Anthropic
Weaknesses
- ・Non-open-source license
- ・Closed model specifications
- ・Lack of detailed technical info
Use Cases
- ・Analysis of ultra-long documents
- ・Development of advanced AI chatbots
- ・Conversations requiring large context
Deep Analysis
Status
Unreleased / Rumored
Not officially announced by Anthropic
Current Latest
Claude Sonnet 4.6
Released Feb 17, 2026
Context Window
1M tokens (Sonnet 4.6)
Expected similar or larger
Expected Capabilities
Enhanced reasoning, agents
Based on roadmap leaks
Weaknesses
- ・Not yet released - no real public data available
- ・Only rumored based on roadmap leaks
- ・Cannot verify benchmarks or pricing
Claude Sonnet 4.8 is a rumored future Anthropic model not yet released as of May 2026. The current latest Sonnet model is Claude Sonnet 4.6 (released Feb 2026) with 1M context window. No official announcement or public benchmarks exist for 4.8.
Analysis generated: 2026-05-24