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gpt-5.3-codex-spark is purpose-built for fast interactive coding at scale — use it to refactor features, debug issues, and ship faster in daily development workflows.

gpt-5.4 is OpenAI's latest foundation model for complex reasoning, coding, and agentic tasks — use when quality and accuracy matter most.

gpt-5.4-high is a high-intelligence mode for the GPT-5.4 series, tuned for complex reasoning and difficult tasks on demand.

gpt-5.4-mini is a fast, strong everyday workhorse for chat, coding assistance, and lightweight agents where speed and cost efficiency matter most.

gpt-5.4-pro is OpenAI's most capable model for the toughest problems—deep reasoning, research-grade analysis, and complex, multi-step workflows.