GPT-6.1 Terra vs. Claude Opus 5.5: Cheaper and faster in three tests at max effort
GPT-6.1 Terra is positioned as a cost-effective alternative to Opus 5.5, with OpenAI reporting lower costs per task on benchmarks like Terminal-Bench-Science 0.1 and Agents’ Last Exam. While OpenAI claims high efficiency and competitive accuracy, initial tests suggest some inconsistencies in numerical calculations compared to GPT-6 Astra.
Key points
- GPT-6.1 Terra costs $1 per million input and $5 per million output tokens.
- OpenAI claims Terra is over three times more token-efficient than Opus 5.5.
- On Agents’ Last Exam, Terra scored 60.0% at $1.01 per task versus Opus's 63.2% at $8.82.
Summary and key points written by AI from the headline and a short excerpt, so they can be incomplete or wrong. The New Stack did the reporting; read the original for the full story.
Read the full story at The New Stack
