GPT-6.1 Terra vs Claude Sonnet 5.5: Polish Test Results

QUANTSLANT_ Benchmarks

quantslant@ai:~$ cat news_1 › GPT-6.1 Terra and Claude Sonnet 5.5 are mid-tier models from OpenAI and Anthropic.

quantslant@ai:~$ cat news_2 › Terra’s API rates are exactly half Sonnet’s: $1 / $5 versus $2 / $10 per million tokens.

quantslant@ai:~$ cat news_3 › On October 26, 2026, I gave both models the same set of tasks: 12 tasks in Polish, four office tasks involving technical drawings, a quote and a form, 20 questions about regulations, and the same letter to a tax authority 10 times.

quantslant@ai:~$ cat news_4 › They tied on the Polish-language test, scoring 65 to 64.5 points.

GPT-6.1 Terra vs Claude Sonnet 5.5: Polish Test Results

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