Anthropic 刚发了 Sonnet 5，性能接近 Opus 4.8 但更便宜，不过新 tokenizer 会让你的账单多掏 30%，用之前先算好账。
Anthropic 发布了 Claude Sonnet 5，其性能接近 Opus 4.8 但价格更低。模型支持 1M 上下文窗口和 128K 输出 token，自适应思考默认开启。新 tokenizer 使英文文本 token 数增加约 30%，实际成本上升约 30%。定价保持 Sonnet 4.6 水平：$3/百万输入、$15/百万输出，8月31日前有折扣。
What's new in Claude Sonnet 5
What's new in Claude Sonnet 5 Claude Sonnet 5 came out this morning . I always head straight for the "what's new" developer docs because they tend to have more actionable information than the official announcement post. Anthropic say of Sonnet 5 that "its performance is close to that of Opus 4.8, but at lower prices". The system card helps explain how they were able to release the model without being blocked by the US government: Sonnet 5 is significantly less capable at cyber tasks than Mythos 5: its safeguards are thus similar to those we apply to Opus 4.7 and Opus 4.8 (models that are more capable than Sonnet 5 but much less capable than Mythos 5). Of note from the "what's new" API changes: Sampling parameters temperature , top_p , top_k are no longer supported. It has a 1 million token context window and 128,000 maximum output tokens. It features "the same set of tools and platform features as Claude Sonnet 4.6" Adaptive thinking is on by default, unless you specify "thinking": {type: "disabled"} . The pricing is the same as Sonnet 4.6: $3/million input, $15/million input, with an introductory discount to $2/$10 until 31st August. But... The model has a new tokenizer, where "The same input text produces approximately 30% more tokens than on Claude Sonnet 4.6." - effectively a 30% price increase. I used my Claude Token Counter tool to try out the new tokenizer. Here are my results for several larger documents: Document Sonnet 4.6 Opus 4.7 Sonnet 5 Universal Declaration of Human Rights (English) 2,356 3,347 1.42x 3,341 1.42x Universal Declaration of Human Rights (Spanish) 3,572 4,753 1.33x 4,747 1.33x Universal Declaration of Human Rights (Chinese, Mandarin Simplified) 3,334 3,366 1.01x 3,360 1.01x sqlite_utils/db.py (4,279 lines of Python) 44,014 56,118 1.28x 56,113 1.27x So the new token is roughly 1.4x times more expensive for English, 1.33x for Spanish, 1.28x for Python code and effectively the same cost for Simplified Mandarin. Here's the pelican . It's nothing to write home about. Sonnet 5 thinks it looks like a goose. Via Hacker News Tags: ai , generative-ai , llms , anthropic , claude , llm-pricing , pelican-riding-a-bicycle , llm-release