#Bug: GPT-5.5 Pro / gpt-5.5-pro produces zero output as OpenClaw subagent (Responses API models)

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crisp girder
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OpenClaw version: 2026.5.3-1
Model: openai/gpt-5.5-pro (api: openai-responses)
Platform: macOS, Mac mini

What happens: Every subagent spawn with gpt-5.5-pro returns empty session history (2 bytes). Gateway log shows agent.wait timing out at 120000ms. Model works correctly via raw curl to v1/responses — returns output instantly. Fails only inside the OpenClaw subagent pipeline.

Steps to reproduce:

  1. Add gpt-5.5-pro to models config with api: openai-responses
  2. sessions_spawn with model: gpt-5.5-pro, simple task like "say WORKING"
  3. Session history returns empty, gateway log shows timeout

Evidence: Raw API test via v1/responses with same API key returns output successfully. gpt-5.5 (chat completions) works as subagent. Issue is specific to openai-responses API type in subagent lane.

Request: Fix Responses API model compatibility in the subagent runner, or document a workaround config.