C
Anthropic: claude-sonnet-4-6-thinking
claude-sonnet-4-6-thinking
1M context64K outReasoningToolsVisionFilesCacheStructuredComputer usePrefill
Released Feb 17, 2026Knowledge cutoff Nov 2025Updated Aug 25, 2026
Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with memory, polished document creation, and confident computer use for web QA and workflow automation.
Mode chatTokenizer ClaudeReasoning levels maxModeratedDeprecation Feb 2027
Pricing
Input price
$1.05/ 1M tokens$3.0065% off
Output price
$5.25/ 1M tokens$15.0065% off
Compatible endpoints openai, anthropicVendor Anthropic
Uptime
Performance
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Usage & Ranking
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Supported parameters
All providers = every upstream serving this model supports it. Some providers = depends on which upstream handles the request. Default = the value sent when you leave the parameter unset.
| Parameter | Providers | Default |
|---|---|---|
| include_reasoning | All providers | - |
| max_completion_tokens | Some providers | - |
| max_tokens | All providers | - |
| reasoning | All providers | - |
| reasoning_effort | All providers | - |
| response_format | All providers | - |
| stop | All providers | - |
| structured_outputs | All providers | - |
| temperature | All providers | - |
| tool_choice | All providers | - |
| tools | All providers | - |
| top_k | Some providers | - |
| top_p | All providers | - |
| verbosity | All providers | - |