#128248 registered gpt-6.1-sol but left it out of the -900k opt-in because
nothing was verified above 272K on Codex. Live probe on the ChatGPT OAuth
route (2026-09-29, streaming /responses, server-reported input_tokens, effort
low): gpt-6.1-sol completed at 684,566, 898,681 and 918,137 input tokens with
all three needles recalled, and was rejected with context_length_exceeded at
about 931K and above, in line with the model page's 922,000 max input. The
live catalog advertises 272K with an 872K ceiling, which still caps the bump.
Eligibility is by exact slug, not the gpt-6-sol family prefix, so the dotted
slug is its own verified line and no -pro variant is synthesized. The variant
is billed as the base model.
(cherry picked from commit 4772e9db5d7b0fe22da80dea4f3c662672ea5302)
5bb6127c5b