Key Info

LiteLLM has added Day 0 support for Claude Opus 5.5, the latest model in Anthropic's Claude 5.5 family, which performs at the level of Claude Fable 5.1 for most tasks.

Highlights

  • Claude Opus 5.5 is around 30% faster and ~40% cheaper than Opus 5 per task.
  • LiteLLM users can now access the new model through the OpenAI-compatible interface.