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OpenAI: Migrating to GPT-5.4

Use this guide when you are moving existing traffic onto openai/gpt-5.4. This usually means replacing older OpenAI routes such as GPT-4.1, GPT-5, or an earlier GPT-5.x release. GPT-5.4 is less about a brand-new request shape and more about updated reasoning controls, vision handling, and tool use. As of March 10, 2026, OpenAI’s official GPT-5.4 docs emphasize reasoning.effort, improved computer use, and higher-fidelity image input. They do not document a GPT-5.4-specific phase parameter.

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What changed

  • reasoning.effort supports none, low, medium, high, and xhigh
  • GPT-5.4 introduces original image input detail for full-fidelity visual perception
  • the updated computer tool is the official path for GPT-5.4 computer-use workflows
  • GPT-5.4 improves long-horizon tool use, large-context work, and professional document workflows

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What to change in your integration

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1. Review reasoning settings

If you are coming from GPT-4.1 or an earlier GPT-5 variant, do not assume your previous reasoning defaults are still the best choice. Re-test routes at the effort level that matches their latency budget:
  • none or low for low-latency routes
  • medium or high for most structured tasks
  • xhigh for deeply reasoned or agentic workflows

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2. Revisit vision pipelines

If your workflow depends on dense screenshots, documents, or UI localization, test the new original image detail level. This changes both fidelity and cost characteristics.

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3. Re-check computer-use routes

If you are migrating browser or desktop automation tasks, update them to the current computer tool path and retest step completion end to end.

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What to test

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Prompt compatibility

  • long system prompts
  • extraction and classification prompts
  • format-sensitive outputs
  • prompts that previously needed retries to stay on task

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Tools and structured outputs

  • schema adherence at each effort level
  • tool selection quality
  • argument completeness
  • stability of computer-use flows across multiple steps

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Vision and operations

  • screenshot and document understanding with high versus original detail
  • latency and token usage under realistic load
  • retry and timeout rate
  • cost per successful task versus the model you are replacing

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Safe rollout

  1. Benchmark GPT-5.4 with the exact effort levels you intend to use.
  2. If you use images, test original detail separately because it changes both quality and cost.
  3. Shadow production prompts before switching any default route.
  4. Promote gradually with an older OpenAI model or alternate provider still available as fallback.

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Sources

Last modified on March 11, 2026