Anthropic Launches Opus 5.5 Fast Mode to General Availability With 2.5x Speed Boost

Anthropic has ended the research preview period for Opus 5.5 fast mode on the Claude Platform, removing access restrictions and making the accelerated version of its flagship model immediately available to all developers. The fast variant maintains the same model weights and capabilities as standard Opus 5.5 but achieves up to 2.5x higher output throughput, reaching approximately 285 tokens per second, priced at $8 and $40 per million input and output tokens respectively—double the standard rate of $4 and $20.