Start/sit AI that reads your actual roster
FantasyBot gives a START, FLEX, or SIT verdict for every player on your real roster, not a generic rankings list. Connect your ESPN, Yahoo, or Sleeper league and ask "who should I start this week?" in ChatGPT or Claude, it reads your lineup slots, your scoring format, this week's opponents and projections, and returns a decision per player with the numbers behind it. You can also compare specific named players head-to-head without connecting anything.
Why generic rankings get flex calls wrong
A rankings list is built for an average league. Your league is not average. Half-PPR versus full PPR moves pass-catching backs several slots. A superflex format changes what a second quarterback is worth. A tight-end-premium league reprices the entire position. A rankings page can't know any of that, so it gives everyone the same answer.
The decision that actually costs people weeks is the flex, where two players sit within a point of each other on a generic board and the right call depends entirely on format and matchup. That's precisely where reading your real league settings changes the answer.
What a FantasyBot start/sit call contains
Ask about your lineup and every player on your roster comes back with a verdict, a projection, and their opponent, so you can see the reasoning rather than take the verdict on faith.
- A START, FLEX, or SIT verdict for every rostered player, including bench and IR
- This week's projection and opponent for each
- Your lineup slots as your league actually defines them, superflex and TE-premium included
- Injury status carried through, so a questionable starter is flagged rather than silently projected
- Suggested swaps when a bench player out-projects a starter in the same slot
Two different questions, two different tools
If you ask "who should I start this week?" without naming anyone, FantasyBot reads your connected roster and works through all of it. If you ask "Jefferson or Chase?", it compares just those two and needs no connected league at all. Both work in ChatGPT and Claude, and the second is a fast way to test the advice before you connect anything.
How FantasyBot actually computes an answer
Most AI fantasy tools are a pipe: they hand your league's raw JSON to a general-purpose model and let it reason from scratch. That works for reading a roster back to you and falls apart on anything requiring calibration, because the model has no fantasy-specific model of value, it's pattern-matching on text.
FantasyBot computes first, then explains. A positional grader scores every starting slot against the market curve, so a median starting lineup lands near 80 and an all-#1 roster approaches 100. Trade values come from a model calibrated to that same curve rather than a static value chart, which is why it can tell you a deal is fine in a 10-team redraft and terrible in your superflex dynasty. Weekly projections, matchup outlooks, and league power rankings all run off the same shared scoring, so the numbers agree with each other.
That's the difference you feel in an answer: you get a verdict with the figures behind it, not a paragraph of hedged prose.
Try these
Questions
Is there an AI that knows my fantasy roster for start/sit?
Yes. Connect your ESPN, Yahoo, or Sleeper league to FantasyBot and ask in ChatGPT or Claude. It reads your actual lineup, scoring format, and this week's matchups, and returns a START, FLEX, or SIT verdict for every player with projections and opponents.
Does it account for PPR, superflex and TE premium?
Yes. It reads your league's real settings, so half-PPR, full PPR, superflex, and tight-end-premium formats all change the verdicts rather than being averaged away.
Can I compare two players without connecting a league?
Yes. Name the players and FantasyBot compares them directly, no league required. Connecting one only matters when you want it to read your whole lineup.
How is this different from a start/sit tool on a fantasy site?
A site tool makes you open a tab, enter players, and read a chart. This runs inside the chat you're already in, reads your roster automatically, and you can ask follow-ups in plain English.
Related
Read-only, no browser extension, free to start.