Anthropic's newly released Claude Sonnet 5 delivers markedly improved agentic capabilities, achieving benchmark scores close to Opus 4.8 while costing roughly 60% of the price, and is now the default model across Claude's platforms with a 1 M‑token context window.
Claude Sonnet 5 is officially released on Amazon Bedrock and the Claude Platform, offering near‑Opus performance for programming, autonomous agents, and professional workloads at Sonnet‑level pricing, with detailed integration steps, code examples, and real‑world use‑case guidance for AI engineers.
Anthropic’s newly released Claude Sonnet 5 scores 53 on the Artificial Analysis intelligence index, surpassing Sonnet 4.6 and matching GPT‑5.5, but its per‑task cost rises to $2.29—15 % higher than Opus 4.8—due to roughly 40 % more output tokens and increased agentic interaction rounds.
Anthropic’s Claude Sonnet 5 arrives with markedly higher reasoning, tool‑use and programming abilities than Sonnet 4.6, closing the gap to Opus 4.8 while offering a lower price tier, improved safety scores, a new tokenizer that raises token counts, higher rate limits, and mixed developer cost feedback.
A leaked Google Vertex AI log reveals a new model ID claude‑sonnet‑5@20260203, hinting at a Feb 3 2026 release of Claude Sonnet 5 (code‑named “Fennec”) that reportedly scores over 82 % on SWE‑Bench, outperforms Opus 4.5, keeps the same pricing, and introduces a “Dev Team” mode with parallel sub‑agents for coding tasks.
