Anthropic · Claude · GPT · Decrypt
Anthropic's Claude Sonnet 5.5 Is Out, Overtakes Opus 5.5 at Coding for Half the Price
Compiled by KHAO Editorial — aggregated from 1 source. See llms.txt for citation guidance.
★ Tier-1 Source
Anthropic released Claude Sonnet 5.5 on Monday, an upgrade to Sonnet 5 from June.
Key facts
- OpenAI cut GPT-6 Sol to $2 and $10 last week, and GPT-5.6 Terra, its mid-tier model, lists at $2 and $12
- The price stays at $2 per million input tokens and $10 per million output tokens
- At max effort it wrote about 193,000 tokens per test task, the most Artificial Analysis has measured and roughly 60% more than Opus 5.5
- On Terminal-Bench 4.0—a test of whether an AI agent can finish complex professional tasks by typing commands on its own, scored as the share of tasks completed—Sonnet 5.5 hit 70.6%
Summary
Anthropic released Claude Sonnet 5.5 on Monday at $2 per million input tokens and $10 per million output tokens—unchanged from Sonnet 5 and half the price of Opus 5.5. Sonnet 5.5 scored 70.6% on Terminal-Bench 4.0 against 66.4% for Opus 5.5, per Anthropic; independent tester Artificial Analysis also has it ahead, 63.6% to 59.6%. Artificial Analysis ranks it second behind Opus 5.5, but says it used more tokens per task than any model it tested. “Sonnet 5.5 is strongest at well-scoped everyday tasks, fixing bugs, and creating polished documents, slides, and spreadsheets.