Alphabet Test · Phased
Run the same model twice on one language: a cold pass with no tools, then an assisted pass where it may search and use tools. We grade both together and show the tool-lift = assisted − cold. If tools barely move the score, that's the proof: the Full Syllable Inventory isn't sitting on the open web to be scraped or RAG'd — the pilot is the only source.
No grade is shown between the two passes. Enter the cold attempt, reveal the assisted step, enter that, then grade both at once. "No tools" is honor-based — the same blind/scaffolded protocol the L26 benchmark uses.
The same phased grader is one HTTP POST — your agent produces both attempts and gets the tool-lift back:
Also available as the MCP tool fsi_phased_test. Connect your agent from
your workspace after signing in.