Add gpt-5.4-codex to resolve_model_config.py

[juanmichelini]

This PR adds gpt-5.4-codex to resolve_model_config.py.

---

Agent Server images for this PR

• GHCR package: https://github.com/OpenHands/agent-sdk/pkgs/container/agent-server

Variants & Base Images

Variant	Architectures	Base Image	Docs / Tags
java	amd64, arm64	eclipse-temurin:17-jdk	Link
python	amd64, arm64	nikolaik/python-nodejs:python3.13-nodejs22	Link
golang	amd64, arm64	golang:1.21-bookworm	Link

Pull (multi-arch manifest)

# Each variant is a multi-arch manifest supporting both amd64 and arm64
docker pull ghcr.io/openhands/agent-server:ce82ca1-python

Run

docker run -it --rm \
  -p 8000:8000 \
  --name agent-server-ce82ca1-python \
  ghcr.io/openhands/agent-server:ce82ca1-python

All tags pushed for this build

ghcr.io/openhands/agent-server:ce82ca1-golang-amd64
ghcr.io/openhands/agent-server:ce82ca1-golang_tag_1.21-bookworm-amd64
ghcr.io/openhands/agent-server:ce82ca1-golang-arm64
ghcr.io/openhands/agent-server:ce82ca1-golang_tag_1.21-bookworm-arm64
ghcr.io/openhands/agent-server:ce82ca1-java-amd64
ghcr.io/openhands/agent-server:ce82ca1-eclipse-temurin_tag_17-jdk-amd64
ghcr.io/openhands/agent-server:ce82ca1-java-arm64
ghcr.io/openhands/agent-server:ce82ca1-eclipse-temurin_tag_17-jdk-arm64
ghcr.io/openhands/agent-server:ce82ca1-python-amd64
ghcr.io/openhands/agent-server:ce82ca1-nikolaik_s_python-nodejs_tag_python3.13-nodejs22-amd64
ghcr.io/openhands/agent-server:ce82ca1-python-arm64
ghcr.io/openhands/agent-server:ce82ca1-nikolaik_s_python-nodejs_tag_python3.13-nodejs22-arm64
ghcr.io/openhands/agent-server:ce82ca1-golang
ghcr.io/openhands/agent-server:ce82ca1-java
ghcr.io/openhands/agent-server:ce82ca1-python

About Multi-Architecture Support

• Each variant tag (e.g., ce82ca1-python) is a multi-arch manifest supporting both amd64 and arm64
• Docker automatically pulls the correct architecture for your platform
• Individual architecture tags (e.g., ce82ca1-python-amd64) are also available if needed

[github-actions]

API breakage checks (Griffe)

Result: Passed

Action log

[github-actions]

Agent server REST API breakage checks (OpenAPI)

Result: Failed

Log excerpt (first 1000 characters)

{"asctime": "2026-03-10 14:04:30,703", "levelname": "WARNING", "name": "openhands.agent_server.config", "filename": "config.py", "lineno": 173, "message": "\u26a0\ufe0f OH_SECRET_KEY was not defined. Secrets will not be persisted between restarts."}
::error title=openhands-agent-server REST API::Breaking REST API change detected without MINOR version bump (1.12.0 -> 1.12.0).

Breaking REST API changes detected compared to baseline release:
- the 'file' request property type/format changed from 'string'/'' to 'string'/'binary'
/home/runner/work/software-agent-sdk/software-agent-sdk/.venv/lib/python3.13/site-packages/litellm/llms/custom_httpx/async_client_cleanup.py:66: DeprecationWarning: There is no current event loop
  loop = asyncio.get_event_loop()

Action log

[all-hands-bot]

🟢 Good taste - Clean addition following existing pattern.

This change is technically sound and follows the established pattern perfectly. However, since this modifies evaluation harness code (.github/run-eval/resolve_model_config.py), it should be reviewed by a human maintainer to confirm no unintended impact on benchmark results before merging.

[all-hands-bot]

🟢 Good taste - Clean addition following existing pattern.

This change is technically sound and follows the established pattern perfectly. However, since this modifies evaluation harness code (.github/run-eval/resolve_model_config.py), it should be reviewed by a human maintainer to confirm no unintended impact on benchmark results before merging.

[juanmichelini]

@OpenHands update PR to also add a test and add it to heuristics like this PR does #2374