Claude Opus 4.6 / Sonnet 4.6
Anthropic · February 2026
⚠ deprecatedCloseddense transformermultimodalAPI Available
Context Window1M tokens
VariantsOpus 4.6, Sonnet 4.6
Description
Expanded Claude's context window to 1 million tokens in beta — enough to process entire codebases or several books at once. Improved planning capabilities and reliability for long-running agent workflows.
Key Innovations
Long Context
Long ContextAbility to process very long inputs (100K+ tokens), enabling analysis of entire codebases or books.
Agentic
AgenticModels that can autonomously plan, execute multi-step tasks, use tools, and self-correct without human intervention.
Reasoning
ReasoningStructured step-by-step problem solving, often using chain-of-thought or tree-of-thought approaches.
Family Tree
Built On
Lineage
Claude 1.0→Claude 2→Claude 3→Claude 3.5 Sonnet→Claude 4 / Opus 4→Claude 4.5 Sonnet→Claude Opus 4.6 / Sonnet 4.6