Anthropic released Claude Haiku 5.5, a faster, lower-cost LLM that matches OpenAI's GPT-6 Luna pricing at $0.10 per 1 k input tokens and $0.50 per 1 k output tokens for up to 100 k tokens. It uses a less efficient tokenizer, increasing token count by about 25 % versus Haiku 4.5, and defaults to medium reasoning effort. Developers can test it via the llm-anthropic plugin and compare costs and performance for code-related generation tasks.
Claude Haiku 5.5 offers GPT-6 Luna-level pricing with higher benchmark scoressimonwillison.net ↗