Claude Opus 5 (Fast) chat
Fast-mode variant of Opus 5 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5.
Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode
Capabilities
Context Window 1M tokens
Max Output 128k tokens
Inputs
Outputs
Pricing (per 1M tokens)
Input $10.00
Output $50.00
Cache Read $1.00
Cache Write $12.50
Supported Parameters
include_reasoningmax_tokensreasoningreasoning_effortresponse_formatstopstructured_outputstool_choicetoolsverbosity