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[Bug]: using codex harness with gpt-5.4-nano causes errors #85806

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#88946
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[Bug]: using codex harness with gpt-5.4-nano causes errors#85806
#88946
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P2Normal backlog priority with limited blast radius.bugSomething isn't workingclawsweeper:fix-shape-clearClawSweeper found a clear likely implementation shape for this issue.clawsweeper:queueable-fixClawSweeper marked this issue as an existing queue_fix_pr work candidate.clawsweeper:source-reproClawSweeper found a high-confidence source-level issue reproduction.impact:auth-providerAuth, provider routing, model choice, or SecretRef resolution may break.issue-rating: 🦞 diamond lobsterVery strong issue quality with high-confidence source-level or clear reproduction.
@garyd9

Description

@garyd9
garyd9
opened on May 23, 2026

Bug type

Regression (worked before, now fails)

Beta release blocker

No

Summary

(Not sure if this is actually a "regression" or not as I'm comparing to a version of openclaw that didn't include codex)
OC 2026.5.20 using codex and openai's gpt-5.4-nano results in errors and fallbacks

Steps to reproduce

start with 4.23 configured to use API and gpt-5.4-nano (Default) and gpt-5.4-mini (fallback)

Chat works fine.

Upgrade to 2026.5.20 and run "doctor --fix" a couple times to get the codex plugin going.

Ensure codex harness is in use and type anything in webchat while the model is gpt-5.4-nano.

Expected behavior

It should just work.

Actual behavior

OC falls back to gpt-5.4-mini and errors are written to the log (see below)

OpenClaw version

2026.5.20

Operating system

linux (debian/trixie)

Install method

install.sh followed by "openclaw update" (npm, I think)

Model

openai/gpt-5.4-nano

Provider / routing chain

direct to openai

Additional provider/model setup details

No response

Logs, screenshots, and evidence

Log snippet from the fallback:

May 23 13:42:23 openclaw node[3091]: 2026-05-23T13:42:23.628-04:00 [agent/embedded] unsupported thinking level for openai/gpt-5.4-nano; retrying with off
May 23 13:42:24 openclaw node[3091]: 2026-05-23T13:42:24.054-04:00 [agent/embedded] codex plugin thread config eligibility
May 23 13:42:24 openclaw node[3091]: 2026-05-23T13:42:24.952-04:00 [agent/embedded] embedded run failover decision: runId=acf78b00-489f-4249-9e91-e016bf24322c stage=prompt decision=surface_error reason=none from=openai/gpt-5.4-nano profile=sha256:a0ebe3f799a6 rawError={ "type": "error", "error": { "type": "invalid_request_error", "message": "Tool 'tool_search' is not supported with gpt-5.4-nano.", "param": "tools" }, "status": 400 }
May 23 13:42:24 openclaw node[3091]: 2026-05-23T13:42:24.953-04:00 [diagnostic] lane task error: lane=main durationMs=4597 error="{
May 23 13:42:24 openclaw node[3091]:   "type": "error",
May 23 13:42:24 openclaw node[3091]:   "error": {
May 23 13:42:24 openclaw node[3091]:     "type": "invalid_request_error",
May 23 13:42:24 openclaw node[3091]:     "message": "Tool 'tool_search' is not supported with gpt-5.4-nano.",
May 23 13:42:24 openclaw node[3091]:     "param": "tools"
May 23 13:42:24 openclaw node[3091]:   },
May 23 13:42:24 openclaw node[3091]:   "status": 400
May 23 13:42:24 openclaw node[3091]: }"
May 23 13:42:24 openclaw node[3091]: 2026-05-23T13:42:24.954-04:00 [diagnostic] lane task error: lane=session:agent:main:main durationMs=4599 error="{
May 23 13:42:24 openclaw node[3091]:   "type": "error",
May 23 13:42:24 openclaw node[3091]:   "error": {
May 23 13:42:24 openclaw node[3091]:     "type": "invalid_request_error",
May 23 13:42:24 openclaw node[3091]:     "message": "Tool 'tool_search' is not supported with gpt-5.4-nano.",
May 23 13:42:24 openclaw node[3091]:     "param": "tools"
May 23 13:42:24 openclaw node[3091]:   },
May 23 13:42:24 openclaw node[3091]:   "status": 400
May 23 13:42:24 openclaw node[3091]: }"
May 23 13:42:24 openclaw node[3091]: 2026-05-23T13:42:24.958-04:00 [model-fallback/decision] model fallback decision: decision=candidate_failed requested=openai/gpt-5.4-nano candidate=openai/gpt-5.4-nano reason=unknown providerErrorType=invalid_request_error next=openai/gpt-5.4-mini detail=Tool 'tool_search' is not supported with gpt-5.4-nano.

Impact and severity

Affected: unknown

Severity: For those using nano to save money, the constant fallback to a more expensive model is severe, though changing to the pi harness works around the issue.

Frequency: 100% reproducible

Consequence: It really makes openAI's codex harness look bad.

Additional information

It is possible to switch to the pi model to work around the issue.

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    P2Normal backlog priority with limited blast radius.bugSomething isn't workingclawsweeper:fix-shape-clearClawSweeper found a clear likely implementation shape for this issue.clawsweeper:queueable-fixClawSweeper marked this issue as an existing queue_fix_pr work candidate.clawsweeper:source-reproClawSweeper found a high-confidence source-level issue reproduction.impact:auth-providerAuth, provider routing, model choice, or SecretRef resolution may break.issue-rating: 🦞 diamond lobsterVery strong issue quality with high-confidence source-level or clear reproduction.

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