Summary
I noticed this issue while working on the footer token counter, but this happens on opencode official releases as well.
After discussing the issue on discord, several users saw a similar behavior.
While some could NOT reproduce it over dozens of tries, others witnessed it at close to a 50% rate.
This issue was seen on multiple providers and models so far:
github-copilot/gpt-4.1openai/gpt-4.1google/gemini-2.5-pro
It isn't clear whether opencode sends system prompt etc in duplicate or if the token count mechanism suffers from a counting error.
This is issue likely hits every models and providers, for some users? Could lead to preemptive auto /compact in a session and probably other shenanigans?
I also been seeing session token count regress at times for no apparent reason 🤦♂️
Summary
I noticed this issue while working on the footer token counter, but this happens on opencode official releases as well.
After discussing the issue on discord, several users saw a similar behavior.
While some could NOT reproduce it over dozens of tries, others witnessed it at close to a 50% rate.
This issue was seen on multiple providers and models so far:
github-copilot/gpt-4.1openai/gpt-4.1google/gemini-2.5-proIt isn't clear whether opencode sends system prompt etc in duplicate or if the token count mechanism suffers from a counting error.
This is issue likely hits every models and providers, for some users? Could lead to preemptive auto /compact in a session and probably other shenanigans?
I also been seeing session token count regress at times for no apparent reason 🤦♂️