And Claude Sonnet 5 just launched.
Rohan Paul Twitter · Rohan Paul (@rohanpaul_ai) · 2026-06-30
Anthropic launches Claude Sonnet 5 with a 1 million token context window and 63.2% SWE-bench Pro score, positioned as a cheaper, faster alternative to Opus 4.8 at introductory pricing of $2 input and $10 output per million tokens through August 2026.
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Topics: claude-sonnet-5model-releaseagentic-aibenchmark-performancellm-pricing
Claims
- Claude Sonnet 5 scores 63.2% on SWE-bench Pro, compared to 58.1% for Sonnet 4.6 and 69.2% for Opus 4.8.
- Sonnet 5 is priced at $2 input and $10 output per million tokens until August 2026, rising to $3 and $15 afterward.
- Sonnet 5 slightly outperforms Opus 4.8 on knowledge work tasks despite Opus's reputation for deep research and tough judgment.
- Anthropic describes Sonnet 5 as its most agentic Sonnet model yet.
- Sonnet 5 has a 1 million token context window.
Key quotes
Sonnet 5 gets 63.2% in agentic coding, while Opus 4.8 reaches 69.2% and Sonnet 4.6 hits 58.1%.
They call Sonnet 5 its 'most agentic Sonnet model yet.'
This makes agentic AI much cheaper, with $2 input tokens and $10 output tokens per 1M through Aug-26.