[Upstream PR #148] fix(openai): disable image generation tool for Codex models

[quangdang46]

Mirrored from upstream 1jehuang/jcode — Pull Request #148 by @naveenreddy007
Original state: open
Created: 2026-05-06T18:46:15Z · Updated: 2026-05-06T18:46:19Z
Diff: https://github.com/1jehuang/jcode/pull/148.diff
This issue is an auto-mirrored copy. Comments and edits here are local to quangdang46/jcode — do not expect them to propagate upstream.

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Summary

• Do not attach the provider-native image_generation tool when the active OpenAI/ChatGPT model is a Codex model.
• Preserve native image generation for non-Codex ChatGPT models.
• Add payload regression tests for both supported and unsupported model families.

Why

ChatGPT/Codex routes such as gpt-5.3-codex-spark can reject requests with:

invalid_request_error: Tool 'image_generation' is not supported with gpt-5.3-codex-spark-1p-codexswic-ev3.

This happens because Jcode currently adds image_generation for all ChatGPT-mode OpenAI requests. Codex models do not support that native tool, so requests can fail before the assistant can respond.

Validation

• cargo fmt --all
• cargo test test_chatgpt_payload_ --lib
• cargo build --release

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