Claude Sonnet 5.5

Claude Sonnet 5.5, like Opus 5.5, encountered a bug where the "max" thinking effort pelican consumed 128,000 tokens, costing $1.28, before failing to produce an SVG due to running out of tokens. Anthropic announced that Haiku 5.5 is expected "in the coming weeks," with hopes for price competitiveness against GPT-6 Luna.

This report uniquely details the specific token consumption and cost ($1.28 for 128,000 tokens) associated with the Sonnet 5.5 bug, unlike general bug reports.