Overview
Claude Sonnet 4.6 launched on February 17, 2026, as Anthropic's most capable mid-tier model to date. It achieves parity with previous frontier-level models on agentic and computer-use benchmarks while maintaining the same pricing structure.
Key Capabilities
Coding Performance
Sonnet 4.6 features substantially upgraded code generation, debugging, and explanation capabilities. Internal benchmarks show meaningful improvements over Sonnet 4.5 across multiple programming languages and complex software engineering tasks.
1 Million Token Context Window (Beta)
The model introduces support for a 1 million token context window in beta, enabling processing of entire codebases, lengthy documentation sets, or dozens of documents simultaneously.
Adaptive Thinking
Like its predecessors, Sonnet 4.6 supports adaptive and extended thinking modes, allowing the model to allocate more computational resources to complex reasoning tasks.
Beta Context Compaction
A new context compaction feature helps manage very long conversations by intelligently summarizing earlier context.
Availability
Sonnet 4.6 is accessible via:
- Claude.ai (Pro and Team plans)
- Claude Code (CLI and IDE integration)
- API (model string: claude-sonnet-4-6)
- Cloud platforms: Amazon Bedrock, Google Vertex AI, and others
Pricing
Sonnet 4.6 maintains Sonnet 4.5 pricing:
- $3 per million tokens (input)
- $15 per million tokens (output)
Comparison to Opus 4.7/4.8
Sonnet 4.6 serves as the optimal choice for routine-to-intermediate tasks where cost-efficiency matters. Users requiring frontier-level judgment, complex architectural planning, or multi-service refactoring should consider Opus 4.7 or 4.8.