Claude Sonnet 5 Released: Performance Nears Opus with Hidden Price Hike
Score
65Why selected
Significant performance gains but with hidden price increases, limited innovation—solid iterative update rather than breakthrough.
AI commentary
「Sonnet 5's nominal price drop with real cost increase highlights hidden cost shifts in model iterations, directly impacting developer planning and budgeting.」
Quick overview
Anthropic released Claude Sonnet 5, with performance close to Opus 4.8 at a lower price. However, a new tokenizer increases input tokens by ~30%, effectively raising costs. The model features a 1M token context window, 128K max output tokens, adaptive thinking enabled by default, and dropped temperature/top_p/top_k parameters. Its cyber capabilities are below Mythos 5, with safeguards matching Opus 4.7/4.8.
- Performance close to Opus 4.8, pricing same as Sonnet 4.6 ($3/M input, $15/M output, with discount until Aug 31)
- New tokenizer increases English input tokens by ~40%, no change for Chinese, effective cost up ~30%
- 1M token context window, 128K max output tokens
- Adaptive thinking enabled by default; temperature, top_p, top_k parameters dropped
Full text
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