Claude Sonnet 4.6
Claude Sonnet 4.6 remains active with a one-million-token context and adaptive thinking. It occupies an earlier generation than Sonnet 5 and 5.5.
Hosting platforms can use different request formats
The reference documents an InvokeModel integration and Bedrock-style identifiers for Amazon Bedrock. These are deployment details for the same release, not extra base models. The direct Claude API uses claude-sonnet-4-6. A provider-specific identifier must match the platform that receives the request.Claude Sonnet 4.6 model reference
Specifications & access
| Detail | Value and conditions |
|---|---|
| Launch date | |
| Access | API |
| Model identifiers | claude-sonnet-4-6 |
| Context window | 1,000,000 tokens Direct Claude API context limit Claude Sonnet 4.6 model reference |
| Maximum output | 128,000 tokens Synchronous Messages API maximum Claude Sonnet 4.6 model reference |
| Maximum output | 300,000 tokens Message Batches only, with output-300k-2026-03-24 beta header Claude Sonnet 4.6 model reference |
| Input price | 3 USD per million tokens Standard direct API input; cache, batch and tool charges are separate Claude Sonnet 4.6 model reference |
| Output price | 15 USD per million tokens Standard direct API output Claude Sonnet 4.6 model reference |
| Input and output | Text and images in; text outClaude Sonnet 4.6 model reference |
| Reasoning control | Adaptive thinking; manual extended thinking is deprecated. Default effort is high.Claude Sonnet 4.6 model reference |
| Reliable knowledge cutoff | August 2025Claude Sonnet 4.6 model reference |
Related models
- Claude Sonnet 5
Anthropic · Claude Sonnet
Claude Sonnet 5 is an active earlier Sonnet release with adaptive thinking.
Launch date API - Claude Sonnet 4.5
Anthropic · Claude Sonnet
A deprecated Sonnet model for reasoning, coding and visual understanding.
Launch date Deprecated API; check access detailsAPI