Anthropic: claude-sonnet-4-6-thinking
claude-sonnet-4-6-thinking
1M context64K outReasoningToolsVisionFilesCacheStructuredComputer usePrefill
Released Feb 17, 2026Knowledge cutoff 2025Updated Feb 17, 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 maxModerated
All providers for this model are busy right now
Every upstream provider has hit its rate limit. The model comes back automatically once limits lift, usually within hours. Try again in a little while or switch to another model.
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Input price
$0.34/ 1M tokens$3.0089% off
Output price
$1.69/ 1M tokens$15.0089% off
Compatible endpoints anthropic, openaiVendor Anthropic
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 |
|---|---|---|
| frequency_penalty | Some providers | Not sent by default |
| include_reasoning | All providers | - |
| max_completion_tokens | Some providers | - |
| max_tokens | All providers | - |
| presence_penalty | Some providers | Not sent by default |
| reasoning | All providers | - |
| repetition_penalty | Some providers | Not sent by default |
| response_format | All providers | - |
| stop | All providers | - |
| structured_outputs | Some providers | - |
| temperature | All providers | Not sent by default |
| tool_choice | All providers | - |
| tools | All providers | - |
| top_k | Some providers | Not sent by default |
| top_p | All providers | Not sent by default |
| verbosity | All providers | - |