LLM Test - Pangram Substitution Puzzle

Test and benchmark large language models (LLMs) with our interactive pangram-substitution puzzle. Measure LLM reasoning, prompt handling, and problem-solving skills in real time with a browser-based AI evaluation tool that doubles as a fun logic game.

Jan 13, 2026 v0.1

Configure Settings

Make sure to pick a unique seed number to ensure the LLM has not already solved the puzzle.

Current Levels Value:
Decimal: 0 Binary: 00000 Hex: 0x0
Active Levels:
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Check The Answer





The quick fox pangram lookup test. Create a language that maps real words to
words within the target word list. Then ask the LLM to figure out the
sentence and then fill in the missing word(s).
MakeLevel
ChatGPT4+1
5+2
5.1+0
Gemini2+1
2.5+2
3+2
Grok4+3
Kimik2+3
Sonnet4Unable-1
Levels measure the reasoning models. On auto setting (no super pro plans).
And score represents total reasoning capacity. It does not measure cost.
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