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Field
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Claude Opus 4.8 (Fast)
anthropic/claude-opus-4.8-fast
OrganizationAnthropic
FamilyClaude
Released2026-05-27
Context window1M
Max output128K
Modalities
DocumentInputImageInputTextInputTextOutput
ProvidersOpenRouter, Kilo Gateway, Vercel AI Gateway, Anthropic
WeightsClosed
Attachments-
Reasoning
Native
Parameters: include_reasoning, reasoning, reasoning_effort
Tool call
Native
Parameters: tool_choice, tools
Structured
Native
Parameters: response_format, structured_outputs
Temperature-
Open weight-
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