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Route image-generation requests through gpt-5.5 by default: the official ChatGPT account channel no longer reliably accepts gpt-5.4-mini as the base model for this image path, so the previous transformed request could be rejected upstream with an incompatibility error. The local API Service now uses gpt-5.5 as the Responses base model while keeping gpt-image-2 as the image tool model.
Improve Codex protocol compatibility: normalize tool schemas by removing unsupported JSON Schema dialect metadata, sanitize tool names for Codex upstream rules, recover uniquely identifiable tool namespaces, preserve service_tier and cache-write token usage, explicitly forward omitted function-tool strict=false, and classify retry-advised server errors as eligible for Codex account failover.
Harden Codex failure and collaboration handling: simplify large constant tool-schema unions, detect silent zero-token response.incomplete terminations, keep quota failures scoped to the affected credential, and restore dotted collaboration tool names after multi-agent optimization.