Theo says Opus 5.5 takes half of all T3 Code prompts
The first model to cross the halfway line in his coding client, and he did not say what the other half splits into.
Theo says Opus 5.5 is the first model to break the 50% traffic threshold in T3 Code, the coding client he runs. His words are that literally half of all prompts now go to Opus.
Opus 5.5 is the first model we've seen break the 50% traffic threshold in T3 Code.
That is the whole claim. He gave no breakdown of what the other half splits into, no chart of how the share moved week to week, and no absolute prompt count. It is one founder reporting a number about his own product, which is how most of these numbers arrive.
Why a 50% line is worth noticing
T3 Code is model agnostic by design, which is the point of the product. Users pick. When a client like that reports that one model is taking half the traffic, the choice is being made by people paying for the output, not by a routing default someone set once and forgot.
Theo said earlier this week that T3 Code passed 400,000 users, so the base this percentage sits on is not tiny. He has also been vocal about Opus pricing, saying a $200 Claude subscription bought him what he reckoned was $9,000 of Opus usage in a month, which is a reason heavy users might lean on one model rather than shop around.
The business read
The standard pitch for a multi-provider client is the hedge. Swap models when one gets slow, expensive or dumb, never get locked in. This number suggests buyers do not spread their bets when one model is clearly ahead on the work they care about, they pile onto it and the optionality sits unused.
Worth holding loosely. Concentration this sharp is a snapshot of one moment with one model in front, and the same users who jumped to Opus can jump off it. Vercel's gateway spend swung from 69% Anthropic to 40% when the leaderboard moved, so half of all prompts is a reading on Opus right now, not a permanent position.